PennEngineering Threaded Inserts For Plastics

Specifications

• Part Number Designation: IU B – 440 – 2
• Material: Lead-free, lightweight aluminum inserts
• Thread Code: Internal, ASME B1.1, 2B / ASME B1.13M, 6H
• Material Code: B = Free-machining, leaded brass; C = 300 series stainless steel; A = Aluminum
• Insert Design Types: Flange-head, Symmetrical, Full Diamond Knurl, Non-knurled Symmetrical
• Finishes: Plain, per ASTM A380
• Clearance Hole for Mating Screw Sizes: #2-56 through 5/16-18 and M2 through M8

Installation Methods

• Ultrasonic
• Heat Staking
• Molded-in

Insert Design Types

• Flange-head: Provides high resistance to axial loads and can be used for all installation methods.
• Symmetrical: Offers fast loading without the need to orientate the part and can be used for all installation methods.
• Full Diamond Knurl: Reduces the risk of sink marks and can be used in mold-in installation.
• Non-knurled Symmetrical: Designed for automation and high-volume applications needing compressive load resistance, can be used in mold-in installation.

Insert Materials

• Aluminum
• Brass
• Carbon Steel
• Stainless Steel

Finishes

• Plain finish
• Clearance Hole for Mating Screw Sizes: #2-56 through 5/16-18 and M2 through M8

FAQ
Question: What are the available installation methods for the threaded inserts?
Answer: The available installation methods are Ultrasonic, Heat Staking, and Molded-in.

SI® brand inserts employ press-in, molded-in, or heat/ultrasonic installation methods to provide strong, reusable, permanent threads in plastic.

•  SI® inserts are typically specified in applications where strong, durable metal threads are required in plastic material, especially where frequent assembly and disassembly of the unit for service or repair is necessary.

• Applications for SI® products include: electronics (including wearables, smart phones and hand held devices), automotive, aerospace and defense, medical, transportation, industrial and recreational equipment.

• SI® inserts are available in brass, stainless steel and aluminum.
  SI® inserts are available in a large variety of ultrasonic / heat staking, molded-in or press-in types.

• Aluminum and stainless steel inserts for plastics offer lead-free alternatives to leaded brass typically used for brass inserts.

  • Lead-free inserts offer alternative to leaded brass to address environmental and end-of-life recycling concerns.
  • Aluminum inserts are approximately 70% lighter than brass equivalents and made from lead-free aluminum.
  • Stainless steel inserts are typically stronger than brass and may offer better protection from certain types of corrosive agents.
  • NEW compression limiters for plastic assemblies.
  • SI® microPEM® inserts provide threads as small as M1.

Part Number Designation And Material And Finish Specifications

Insert drawings and models are available at www.pemnet.com

SI® Brand Compression Limiters for plastic applications

Compression limiters are non-threaded inserts that are commonly used in applications where a compressive load is applied to a plastic assembly. The compression limiter strengthens the plastic and withstands the compressive force that is applied when a mating screw is tightened in the assembly. The integrity of the plastic is not compromised by the load that is applied.

• Custom designed in a wide range of sizes and profiles
• Available in brass, stainless steel, and lead-free aluminum
• Installed using ultrasonic, heat-staking or molded-in installation methods
• Available design types; flange-head, symmetrical, full diamond knurl and non-knurled symmetrical

Available Options

Installation Methods| Insert Design Types| Insert Materials| Finishes| Clearance Hole for Mating Screw Sizes:
---|---|---|---|---
Ultrasonic Heat Staking Molded-in| Flange-head Symmetrical

Full Diamond Knurl

Non-knurled Symmetrical

| Aluminum, Brass| Plain|

2-56 through 5/16-18 and M2 through M8

Carbon Steel| Zinc plated, 5µm, colorless
Stainless Steel| Passivated and/or tested
| | per ASTM A380|

Sampling of Insert Design Types

Ultrasonic / Heat Staking Inserts

• Ultrasonic – Installed by pressing the insert into the mounting hole with ultrasonic insertion equipment while simultaneously applying a high frequency vibration. Frictional heat caused by the vibration melts the plastic surrounding the insert allowing easy insertion. When the vibration ceases, the plastic solidifies, locking the insert permanently in place.
• Heat Staking – Installed by pressing the insert into the mounting hole with a thermal press to melt the plastic surrounding the insert.
• IUA, IUB, IUC (Tapered, through threaded inserts) – Page 5
• IUTA, IUTB, IUTC (Straight wall, through threaded inserts) – Page 6
• IUTFA, IUTFB, IUTFC (Flanged, Straight wall, through threaded inserts) – Page 7
• ISA, ISB, ISC (Symmetrical, through threaded inserts) – Page 8
• MSIA, MSIB (microPEM® symmetrical, through threaded inserts) – Page 9
• Performance data for ultrasonic inserts – Page 10-11

Molded-In Inserts

• Installed during the molding process, the inserts are located in the mold cavity by core pins. When the mold opens, the core pins are withdrawn leaving the inserts permanently encapsulated in the plastic section with only the threads exposed.
• Installing the inserts during the molding process eliminates the need for secondary steps or installation equipment.
• IBA, IBB, IBC (Blind threaded inserts) – Page 12
• IBLC (Self-locking blind threaded inserts) – Page 13
• ITA, ITB, ITC (Through threaded inserts) – Page 14
• STKA, STKB, STKC (Knurled inserts) – Page 15
• Performance data for molded-in inserts – Page 16

Press-In Inserts

• Installed by simply pressing the inserts into pre-molded or drilled holes. Installation is accomplished using any standard press at any time during the production process.
• Eliminates the need for molding-in inserts.
• Eliminates the need for heat or ultrasonic equipment.
• NFPC, NFPA (Hexagonal, press-in inserts) – Page 17
• PPA, PPB (Through threaded inserts) – Page 18
• PFLA, PFLB (Flange-head inserts) – Page 19
• PKA, PKB (Straight knurl inserts) – Page 20
• Performance data for press-in inserts – Page 21

Custom Designs, Hole Preparation Guidelines and SI Prototype Kit – Page 22-23

Ultrasonic / Heat Staking Inserts

Tapered Thru-Threaded, IUA™, IUB™ and IUC™ Inserts

• Designed for use in tapered holes.
• Tapered mounting hole allows for rapid and accurate alignment prior to installation.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

All dimensions are in inches.

Unified|

Thread Size

| Type| Thread Code (1)|

Length Code

| A

± .005

| E

± .005

| C

±.005

| Hole Size in Material
---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Min. Hole Depth| D

± .002

| F

± .002

| R Ref.

Taper Length

.060-80

(#0-80)

| IUA| IUB| IUC| 080| 1| .115| .141| .123| .155| .118| .123| .036
2| .188| .115| .228| .107| .114
.086-56

(#2-56)

| IUA| IUB| IUC| 256| 1| .115| .141| .123| .155| .118| .123| .036
2| .188| .115| .228| .107| .114
.112-40

(#4-40)

| IUA| IUB| IUC| 440| 1| .135| .172| .157| .175| .153| .159| .043
2| .219| .149| .259| .141| .129
.138-32

(#6-32)

| IUA| IUB| IUC| 632| 1| .150| .219| .203| .190| .199| .206| .050
2| .250| .190| .290| .185| .150
.164-32

(#8-32)

| IUA| IUB| IUC| 832| 1| .185| .250| .230| .225| .226| .234| .057
2| .312| .213| .352| .208| .186
.190-24

(#10-24)

| IUA| IUB| IUC| 024| 1| .225| .297| .272| .265| .267| .277| .072
2| .375| .251| .415| .246| .222
.190-32

(#10-32)

| IUA| IUB| IUC| 032| 1| .225| .297| .272| .265| .267| .277| .072
2| .375| .251| .415| .246| .222
.250-20 (1/4-20)| IUA| IUB| IUC| 0420| 1| .300| .375| .354| .340| .349| .363| .100
2| .500| .332| .540| .321| .300
.250-28 (1/4-28)| IUA| IUB| IUC| 0428| 1| .300| .375| .354| .340| .349| .363| .100
2| .500| .332| .540| .321| .300
.313-18 (5/16-18)| IUA| IUB| IUC| 0518| 1| .335| .469| .439| .375| .431| .448| .122
2| .562| .406| .602| .401| .336
.375-16 (3/8-16)| IUA| IUB| IUC| 0616| 1| .375| .563| .532| .415| .523| .540| .122
2| .625| .493| .665| .488| .372
Metric| Thread Size x Pitch| Type| Thread Code (1)| Length Code| A

± 0.13

| E

± 0.13

| C

±0.13

| Hole Size in Material
---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Min. Hole Depth| D

± 0.05

| F

± 0.05

| R Ref.

Taper Length

M2 x 0.4| IUA| IUB| IUC| M2| 1| 2.92| 3.58| 3.12| 3.94| 3| 3.12| 0.9
M2.5 x 0.45| IUA| IUB| IUC| M2.5| 1| 3.43| 4.37| 3.99| 4.44| 3.89| 4.04| 1.07
2| 5.56| 3.79| 6.58| 3.58| 3.29
M3 x 0.5| IUA| IUB| IUC| M3| 1| 3.43| 4.37| 3.99| 4.44| 3.89| 4.04| 1.07
2| 5.56| 3.79| 6.58| 3.58| 3.29
M3 x 0.5| IUAA| IUBB| IUCC| M3| 1| 3.81| 5.56| 5.16| 4.83| 5.05| 5.23| 1.29
2| 6.35| 4.83| 7.42| 4.7| 3.79
M3.5 x 0.6| IUA| IUB| IUC| M3.5| 1| 3.81| 5.56| 5.16| 4.83| 5.05| 5.23| 1.29
2| 6.35| 4.83| 7.42| 4.7| 3.79
M4 x 0.7| IUA| IUB| IUC| M4| 1| 4.7| 6.35| 5.84| 5.72| 5.74| 5.94| 1.43
2| 7.92| 5.41| 8.94| 5.28| 4.72
M5 x 0.8| IUA| IUB| IUC| M5| 1| 5.72| 7.54| 6.91| 6.74| 6.78| 7.03| 1.79
2| 9.53| 6.38| 10.55| 6.25| 5.58
M5 x 0.8| IUAA| IUBB| IUCC| M5| 1| 6.71| 8.33| 7.83| 7.72| 7.7| 8| 2.15
2| 11.1| 7.16| 12.12| 7.06| 6.72
M6 x 1| IUA| IUB| IUC| M6| 1| 7.62| 9.52| 8.99| 8.64| 8.86| 9.22| 2.57
2| 12.7| 8.43| 13.72| 8.15| 7.65
M8 x 1.25| IUA| IUB| IUC| M8| 1| 8.51| 11.91| 11.15| 9.53| 10.95| 11.38| 3.07
2| 14.27| 10.31| 15.29| 10.19| 8.51

Ultrasonic / Heat Staking Inserts

Straight Wall, Thru-Threaded, IUTA™, IUTB™ and IUTC™ Inserts

• Self-aligning lead-in of insert provides for accurate alignment prior to installation.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

Unified|

Thread Size

| Type|

Thread Code (1)

|

Length Code

|

A

± .005

|

E

± .009

|

C

±.005

| Hole Size in Material
---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Min. Hole Depth| Hole Dia.

+.003 -.000

.086-56

(#2-56)

| IUTA| IUTB| IUTC| 256| 125| .125| .147| .121| .155| .127
—| .157| .187
.112-40

(#4-40)

| IUTA| IUTB| IUTC| 440| 135| .135| .179| .152| .165| .158
—| .226| .256
.138-32

(#6-32)

| IUTA| IUTB| IUTC| 632| 150| .150| .210| .183| .180| .189
—| .281| .311
.164-32

(#8-32)

| IUTA| IUTB| IUTC| 832| 185| .185| .243| .217| .215| .223
—| .321| .351
.190-24

(#10-24)

| IUTA| IUTB| IUTC| 024| 225| .225| .273| .247| .255| .253
—| .375| .405
.190-32

(#10-32)

| IUTA| IUTB| IUTC| 032| 225| .225| .273| .247| .255| .253
—| .375| .405

.250-20 (1/4-20)

|

IUTA

|

IUTB

|

IUTC

|

0420

| 300| .300|

.342

|

.310

| .330|

.316

312| .312
—| .500| .530
.250-28 (1/4-28)| IUTA| IUTB| IUTC| 0428| —| .500| .342| .310| .530| .316
.313-18 (5/16-18)| IUTA| IUTB| IUTC| 0518| —| .500| .406| .374| .530| .378
.313-24 (5/16-24)| IUTA| IUTB| IUTC| 0524| —| .500| .406| .374| .530| .378
.375-16 (3/8-16)| IUTA| IUTB| IUTC| 0616| —| .500| .509| .462| .530| .468
.375-24 (3/8-24)| IUTA| IUTB| IUTC| 0624| —| .500| .509| .462| .530| .468

All dimensions are in millimeters.

Metric|

Thread Size

| Type|

Thread Code (1)

|

Length Code

|

A

± 0.13

|

E

± 0.23

|

C

±0.13

| Hole Size in Material
---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Min. Hole Depth| Hole Dia.

+0.08

M2 x 0.4

|

IUTA

|

IUTB

|

IUTC

|

M2

| 318| 3.18|

3.73

|

3.07

| 3.94|

3.23

—| 4| 4.76
M2.5 x 0.45| IUTA| IUTB| IUTC| M2.5| —| 5.74| 4.55| 3.86| 6.5| 4.01
M3 x 0.5| IUTA| IUTB| IUTC| M3| 343| 3.43| 4.55| 3.86| 4.19| 4.01
—| 5.74| 6.5
M3.5 x 0.6| IUTA| IUTB| IUTC| M3.5| —| 7.14| 5.33| 4.65| 7.9| 4.81
M4 x 0.7| IUTA| IUTB| IUTC| M4| 470| 4.7| 6.17| 5.51| 5.46| 5.67
—| 8.15| 8.91
M5 x 0.8| IUTA| IUTB| IUTC| M5| 572| 5.72| 6.93| 6.27| 6.48| 6.43
—| 9.52| 10.28
M6 x 1| IUTA| IUTB| IUTC| M6| 762| 7.62| 8.69| 7.87| 8.38| 8.03
—| 12.7| 13.46
M8 x 1.25| IUTA| IUTB| IUTC| M8| —| 12.7| 10.31| 9.5| 13.46| 9.6

1.  Thread tapped thru, Class 3A/4h screw must pass with finger torque, but basic go gauge may stop at last thread.

Ultrasonic / Heat Staking Inserts
Flanged, Straight Wall, Thru-Threaded, IUTFB™ Inserts

• Provides larger surface area and high pullout in reverse entry applications.
• Brass flange offers a contact surface for electrical connections.
• Flange helps distribute the load applied when fastening mating hardware.
• Self-aligning lead-in provides accurate alignment prior to installation.
• Aluminum inserts are ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

All dimensions are in inches.

Unified| Thread Size| Type| Thread Code (1)| A

±.005

| E

±5

| C

±.005

| S 1

Nom.

| S 2

Nom.

| T

±.005

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Brass Steel| Min. Hole Depth| Hole Dia.

+.003 —.000

.086-56

(#2-56)

| IUTFA| IUTFB| IUTFC| 256| .157| .187| .121| .021| .021| .018| .187| .127
.112-40

(#4-40)

| IUTFA| IUTFB| IUTFC| 440| .226| .218| .152| .031| .031| .021| .256| .158
.138-32

(#6-32)

| IUTFA| IUTFB| IUTFC| 632| .281| .250| .183| .031| .031| .027| .311| .189
.164-32

(#8-32)

| IUTFA| IUTFB| IUTFC| 832| .321| .281| .217| .040| .031| .033| .351| .223
.190-24

(#10-24)

| IUTFA| IUTFB| IUTFC| 024| .375| .375| .247| .046| .046| .040| .405| .253
.190-32

(10-32)

| IUTFA| IUTFB| IUTFC| 032| .375| .312| .247| .046| .046| .040| .405| .253
.250-20 (1/4-20)| IUTFA| IUTFB| IUTFC| 0420| .500| .375| .310| .062| .046| .050| .530| .316
.250-28 (1/4-28)| IUTFA| IUTFB| IUTFC| 0428| .500| .375| .310| .062| .046| .050| .530| .316
.313-18 (5/16-18)| IUTFA| IUTFB| IUTFC| 0518| .500| .438| .372| .062| .046| .050| .530| .378
.375-16 (3/8-16)| IUTFA| IUTFB| IUTFC| 0616| .500| .550| .462| .062| .046| .065| .530| .468

All dimensions are in millimeters.

Metric| Thread Size x Pitch| Type| Thread Code (1)| A

±0.13

| E

±0.13

| C

±0.13

| S 1

Nom.

| S 2

Nom.

| T

±0.13

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Brass Steel| Min. Hole Depth| Hole Dia.

+0.08

M2 x 0.4| IUTFA| IUTFB| IUTFC| M2| 3.99| 4.75| 3.07| 0.53| 0.53| 0.46| 4.76| 3.23
M2.5 x 0.45| IUTFA| IUTFB| IUTFC| M2.5| 5.74| 5.54| 3.86| 0.79| 0.79| 0.53| 6.5| 4.01
M3 x 0.5| IUTFA| IUTFB| IUTFC| M3| 5.74| 5.54| 3.86| 0.79| 0.79| 0.53| 6.5| 4.01
M3.5 x 0.6| IUTFA| IUTFB| IUTFC| M3.5| 7.14| 6.35| 4.65| 0.79| 0.79| 0.69| 7.9| 4.81
M4 x 0.7| IUTFA| IUTFB| IUTFC| M4| 8.15| 7.14| 5.51| 1.02| 0.79| 0.84| 8.91| 5.67
M5 x 0.8| IUTFA| IUTFB| IUTFC| M5| 9.53| 7.92| 6.27| 1.17| 1.17| 1.02| 10.28| 6.43
M6 x 1| IUTFA| IUTFB| IUTFC| M6| 12.7| 9.53| 7.87| 1.58| 1.17| 1.27| 13.46| 8.03

1. Thread tapped thru, Class 3A/4h screw must pass with finger torque, but basic go gauge may stop at last thread.

Ultrasonic / Heat Staking Inserts

Symmetrical, Thru-Threaded, ISA™, ISB™ and ISC™ Inserts

• Symmetrical design eliminates the need for orientation.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

All dimensions are in inches.

Unified| Thread Size| Type| Thread Code (1)| A

± .005

| E

± .005

| C

± .003

| Hole Size in Material
---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Hole Depth| Hole Dia.

+.003- .000

.086-56| ISA| ISB| ISC| 256| .157| .151| .122| .187| .126
(#2-56)
.112-40| ISA| ISB| ISC| 440| .226| .182| .153| .256| .157
(#4-40)
.138-32| ISA| ISB| ISC| 632| .281| .215| .184| .311| .188
(#6-32)
.164-32| ISA| ISB| ISC| 832| .321| .245| .217| .351| .221
(#8-32)
.190-32| ISA| ISB| ISC| 032| .375| .276| .248| .405| .252
(#10-32)
.250-20| ISA| ISB| ISC| 0420| .500| .338| .311| .530| .315
(1/4-20)

All dimensions are in millimeters.

Metric| Thread Size x Pitch| Type| Thread Code (1)| A

± 0.13

| E

± 0.13

| C

± 0.08

| Hole Size in Material
---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Hole Depth| Hole Dia.

+0.08

M3 x 0.5| ISA| ISB| ISC| M3| 5.74| 4.62| 3.88| 6.5| 3.99
M4 x 0.7| ISA| ISB| ISC| M4| 8.15| 6.22| 5.51| 8.92| 5.62
M5 x 0.8| ISA| ISB| ISC| M5| 9.52| 7.01| 6.3| 10.29| 6.4
M6 x 1| ISA| ISB| ISC| M6| 12.7| 8.58| 7.9| 13.46| 8

Ultrasonic / Heat Staking Inserts

microPEM® Symmetrical, Thru-Threaded, MSIA™ MSIB™ Inserts

• Threads as small as M1.
• Symmetrical design eliminates the need for orientation.
• Provides excellent performance in wide range of plastics.
• Aluminum inserts ideal for light weight designs.
• Aluminum inserts offer lead-free alternative.

All dimensions are in millimeters.

Metric| Thread Size x Pitch| Type|

Thread Code

|

Length Code

|

A

±0.1

|

E

± 0.1

|

C

Max.

| Mounting Hole in Material
---|---|---|---|---|---|---|---|---
Aluminum| Brass| Min. Wall

Thickness (6)

| Hole Depth Min.| Hole Diameter

+0.05

M1 x 0.25 (3)| MSIA| MSIB| M1| 100 (1)| 1| 2.1| —| 0.7| 1.77| 1.75
250 (2)| 2.5| 1.75| 3.27
M1.2 x 0.25 (3)| MSIA| MSIB| M1.2| 100 (1)| 1| 2.1| —| 0.7| 1.77| 1.75
250 (2)| 2.5| 1.75| 3.27
M1.4 x 0.3 (4)| MSIA| MSIB| M1.4| 150 (2)| 1.5| 2.5| 2.15| 0.8| 2.27| 2.15
300 (2)| 3| 3.77
M1.6 x 0.35 (5)| MSIA| MSIB| M1.6| 150 (2)| 1.5| 2.5| 2.15| 0.8| 2.27| 2.15
300 (2)| 3| 3.77
M2 x 0.4 (5)| MSIA| MSIB| M2| 300 (2)| 3| 3.2| 2.85| 1.6| 3.77| 2.85
400 (2)| 4| 4.77

1. Style #1 – length codes less than 150
2. Style #2 – length codes 150 and greater
3. Metric ISO 68-1, 5H
4. Metric ISO 68-1, 6H
5. Metric ASME B1.13M, 6H
6. Refers to wall diameter of boss as tested in ABS and polycarbonate.

Performance Data For Ultrasonic / Heat Staking Inserts
IUA, IUB, IUBB, IUC, and IUCC Inserts(1)

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (N)| Torque-out (N•m)| Pullout (N)| Torque-out (N•m)
M2-1| 334| 0.3| 400| 0.7
M2.5-1| 334| 0.3| 400| 0.7
M2.5-2| 334| 0.3| 400| 0.7
M3-1| 356| 0.5| 712| 0.8
M3-2| 356| 0.5| 712| 0.8
M3.5-1| 645| 1.7| 734| 2
M3.5-2| 1223| 1.7| 2002| 2.7
M4-1| 912| 2| 1312| 2.3
M4-2| 1646| 2.1| 2869| 2.3
M5-1| 1201| 5.1| 1913| 6.2
M5-2| 2491| 6.8| 4048| 9
M6-1| 1664| 7.3| 2731| 9.6
M6-2| 3025| 7.3| 6294| 12.2

IUTA, IUTB, IUTC Inserts(1)

Unified|

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (lbs.)| Torque-out (in. lbs.)| Pullout (lbs.)| Torque-out (in. lbs.)
256-125| 57| 4| 98| 8
256| 57| 4| 98| 8
440-135| 74| 8| 113| 13
440| 165| 14| 185| 16
632-150| 100| 18| 150| 19
632| 197| 25| 295| 31
832-185| 108| 20| 156| 34
832| 216| 36| 365| 52
024-225| 213| 32| 225| 47
024| 269| 54| 380| 80
032-225| 213| 32| 225| 47
032| 269| 54| 380| 80
0420-300 & 312| 271| 84| 293| 105
0420| 480| 103| 600| 132
0428| 480| 103| 600| 132
0518| 802| 114| 641| 113
0524| 802| 114| 641| 113
0616| 824| 234| 921| 232
0624| 824| 234| 921| 232
Metric|

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (N)| Torque-out (N•m)| Pullout (N)| Torque-out (N•m)
M2-318| 253| 0.45| 436| 0.91
M2| 253| 0.45| 436| 0.91
M2.5| 730| 1.6| 823| 1.8
M3-343| 330| 0.91| 502| 1.5
M3| 730| 1.6| 823| 1.8
M3.5| 876| 2.83| 1311| 3.5
M4-470| 482| 2.3| 694| 3.8
M4| 963| 4.1| 1710| 5.9
M5-572| 948| 3.6| 999| 5.3
M5| 1197| 5.4| 1691| 7.7
M6-762| 1207| 10| 1305| 12
M6| 2130| 11.7| 2660| 14.9
M8| 3566| 26| 4098| 26

IUTA, IUTB, IUTC Inserts(1)

Unified|

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (lbs.)| Torque-out (in. lbs.)| Pullout (lbs.)| Torque-out (in. lbs.)
256| 57| 4| 112| 8
440| 165| 14| 185| 16
632| 197| 25| 295| 31
832| 216| 36| 365| 52
024| 269| 54| 380| 80
032| 269| 54| 380| 80
0420| 480| 103| 600| 132
0428| 480| 103| 600| 132
0616| 516| 285| 620| 378
Metric|

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (N)| Torque-out (N•m)| Pullout (N)| Torque-out (N•m)
M2| 255| 0.5| 578| 0.9
M2.5| 730| 1.6| 823| 1.8
M3| 730| 1.6| 823| 1.8
M3.5| 878| 3.1| 1417| 3.8
M4| 963| 4.1| 1710| 5.9
M5| 1197| 5.4| 1691| 7.7
M6| 2130| 11.7| 2660| 14.9

IUTFA, IUTFB, IUTFC Inserts(1)

Unified|

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (lbs.)| Torque-out (in. lbs.)| Pullout (lbs.)| Torque-out (in. lbs.)
256| 57| 4| 112| 8
440| 165| 14| 185| 16
632| 197| 25| 295| 31
832| 216| 36| 365| 52
024| 269| 54| 380| 80
032| 269| 54| 380| 80
0420| 480| 103| 600| 132
0428| 480| 103| 600| 132
0616| 516| 285| 620| 378
Metric|

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (N)| Torque-out (N•m)| Pullout (N)| Torque-out (N•m)
M2| 255| 0.5| 578| 0.9
M2.5| 730| 1.6| 823| 1.8
M3| 730| 1.6| 823| 1.8
M3.5| 878| 3.1| 1417| 3.8
M4| 963| 4.1| 1710| 5.9
M5| 1197| 5.4| 1691| 7.7
M6| 2130| 11.7| 2660| 14.9

1. The values reported are averages for ultrasonically inserted inserts when all installation specifications and procedures are followed. Variations in mounting hole size, sheet material and

Performance Data For Ultrasonic / Heat Staking Inserts

ISA, ISB and ISC Inserts(1)

Unified|

Thread Code

| ABS| Polycarbonate
---|---|---|---
Pullout (lbs.)| Torque-out (in. lbs.)| Pullout (lbs.)| Torque-out (in. lbs.)
256| 85.5| 6.14| 149.4| 6.37
440| 151.37| 14.38| 344.94| 23.17
632| 320.3| 21.69| 405.9| 18.19
832| 462.9| 31.7| 663.9| 57.15
032| 549.6| 52.3| 1015.4| 71.79
0420| 600.45| 100.25| –| –
Metric| Thread Code| ABS| Polycarbonate
---|---|---|---
Pullout (N)| Torque-out (N•m)| Pullout (N)| Torque-out (N•m)
M3| 680| 1.62| 1550| 2.6
M4| 2080| 3.58| 2980| 6.45
M5| 2470| 5.9| 4560| 8.11
M6| 2700| 11.1| –| –

MSIA and MSIB Inserts(1)

Metric|

Thread Code

|

Length Code

| ABS| Polycarbonate
---|---|---|---|---
Pullout (N)| Torque-out (N•cm) (2)| Pullout (N)| Torque-out (N•cm) (2)
M1| 100| 50| 3.5| 50| 4.5
250| 150| 10| 200| 12
M1.2| 100| 50| 3.5| 50| 4.5
250| 150| 10| 200| 12
M1.4| 150| 100| 15| 140| 15
300| 330| 30| 400| 30
M1.6| 150| 100| 15| 140| 15
300| 330| 30| 400| 30
M2| 300| 335| 35| 410| 33
400| 470| 40| 595| 35

1.  The values reported are averages for ultrasonically inserted inserts when all installation specifications and procedures are followed. Variations in mounting hole size, sheet material and installation procedure will affect results. Performance testing of this product in your application is recommended. Samples can be provided for this purpose.
2. Torque-out performance will depend on the strength and type of screw being used. In most cases, the screw threads will fail before the insert threads. For testing purposes, inserts were installed using heat stake equipment into a flat sheet.

Molded-In Inserts

Blind Threaded, IBA™, IBB™ and IBC™ Inserts

• Blind-end protects the threads from plastic intrusion.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

All dimensions are in inches.

Unified| Thread Size| Type| Thread Code| Length A ± .005 / H Min.| E

Nom.

| C

± .005

| S 1

Nom.

| S 2

Nom.

| Minor Dia. Min./Max.
---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Min. No. of Full Threads
4| 6| 8| 10| 12
.086-56| IBA| IBB| IBC| 256| .156/.080| .219/.115| .250/.150| .312/.185| .344/.220| .156| .142| .03| .03| .067/.0737
(#2-56)
.112-40| IBA| IBB| IBC| 440| .205/.110| .281/.160| .344/.210| .406/.260| .438/.310| .188| .171| .03| .03| .086/.0939
(#4-40)
.138-32| IBA| IBB| IBC| 632| .250/.135| .344/.200| .406/.260| .469/.325| .531/.385| .219| .202| .03| .06| .105/.114
(#6-32)
.164-32| IBA| IBB| IBC| 832| .250/.135| .344/.200| .406/.260| .469/.325| .531/.385| .250| .226| .05| .06| .131/.139
(#8-32)
.190-24| IBA| IBB| IBC| 024| .356/.175| .438/.260| .531/.345| .625/.425| .716/.510| .281| .259| .05| .06| .146/.156
(#10-24)
.190-32| IBA| IBB| IBC| 032| .281/.135| .438/.200| .531/.260| .469/.325| .531/.385| .281| .259| .05| .06| .157/.164
(#10-32)
.250-20| IBA| IBB| IBC| 0420| .344/.200| .531/.315| .625/.415| .719/.515| .819/.615| .344| .321| .06| .09| .197/.207
(1/4-20)
.313-18| IBA| IBB| IBC| 0518| .438/.235| .594/.345| .719/.460| .811/.570| .949/.680| .438| .404| .078| .094| .254/.265
(5/16-18)
.375-16| IBA| IBB| IBC| 0616| .500/.265| .688/.390| .812/.515| .935/.640| 1.00/.765| .500| .466| .094| .094| .309/.321
(3/8-16)

All dimensions are in millimeters.

Metric| Thread Size x Pitch| Type| Thread Code| Length A ± 0.13 / H Min.| E

Nom.

| C

± 0.13

| S 1

Nom.

| S 2

Nom.

| Minor Dia. Min./Max.
---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless Steel| Min. No. of Full Threads
4| 6| 8| 10| 12
M2.5 x 0.45| IBA| IBB| IBC| M2.5| 4.78/2.01| 6.35/2.87| 7.14/3.74| 9.53/4.6| 10.31/5.47| 4.78| 4.34| 0.8| 0.8| 2.03/2.14
M3 x 0.5| IBA| IBB| IBC| M3| 5.21/2.21| 7.13/3.21| 8.73/4.21| 10.31/5.21| 11.13/6.21| 4.78| 4.34| 0.8| 0.8| 2.47/2.59
M3.5 x 0.6| IBA| IBB| IBC| M3.5| 6.35/2.62| 8.73/3.81| 10.31/5.02| 11.91/6.22| 13.48/7.42| 5.56| 5.13| 0.8| 1.6| 2.87/3.01
M4 x 0.7| IBA| IBB| IBC| M4| 6.35/3.08| 8.73/4.47| 10.31/5.89| 11.91/7.29| 13.48/8.69| 6.35| 5.74| 1.2| 1.6| 3.25/3.42
M5 x 0.8| IBA| IBB| IBC| M5| 7.13/3.49| 11.12/5.09| 13.48/6.69| 11.91/8.29| 13.48/9.89| 7.14| 6.57| 1.2| 1.6| 4.15/4.34
M6 x 1| IBA| IBB| IBC| M6| 8.73/4.37| 13.49/6.37| 15.87/8.37| 18.26/10.57| 20.8/12.37| 8.74| 8.15| 1.6| 2.4| 4.94/5.16
M8 x 1.25| IBA| IBB| IBC| M8| 11.13/5.72| 15.09/7.82| 18.24/10.32| 20.62/12.82| 22.23/15.32| 11.13| 10.26| 1.98| 2.4| 6.68/6.92

Self-Locking, Blind Threaded, IBLC™ Inserts

•  Deformed threads create prevailing torque locking feature to prevent screw loosening due to vibration.
• Blind-end protects the threads from plastic intrusion.
• Stainless steel inserts offer lead-free alternative.

Unified| Thread Size|

Type

| Thread Code| Length Code| A

± .005

| E

Nom.

| C

±.005

| S 1

± .005

| S 2

±.005

| Minor Dia. Min./Max. (1)| H

Min.

| First Cycle on Locking Torque (in. lbs.) (2)
---|---|---|---|---|---|---|---|---|---|---|---|---
Style #1| Style #2| Style #1| Style #2| Style #1| Style #2| Min.| Max.
.086-56

(#2-56)

| IBLC| 256| N/A| 8ASSY| .250| .156| N/A| .150| .030| N/A| .030| .067/.0737| .150| 0.2| 2.5
.112-40

(#4-40)

| IBLC| 440| 8| 8ASSY| .344| .188| .171| .180| .030| .130| .030| .086/.0939| .210| 0.5| 5
.138-32

(#6-32)

| IBLC| 632| 8| 8ASSY| .406| .219| .195| .200| .050| .130| .030| .105/.114| .260| 1| 10
.164-32

(#8-32)

| IBLC| 832| 8| 8ASSY| .406| .250| .226| .235| .050| .130| .060| .131/.139| .260| 1.5| 15
.190-32

(#10-32)

| IBLC| 032| 8| 8ASSY| .531| .281| .259| .270| .050| .130| .060| .157/.164| .260| 2| 18
.250-20 (1/4-20)| IBLC| 0420| 8| 8ASSY| .625| .344| .298| .325| .060| .150| .060| .197/.207| .415| 4.5| 30
Metric| Thread Size x Pitch|

Type

| Thread Code| Length Code| A

± 0.13

| E

Nom.

| C

±0.13

| S 1

± 0.13

| S 2

±0.13

| Minor Dia. Min./Max. (1)| H

Min.

| First Cycle on Locking Torque (N•m) (2)
---|---|---|---|---|---|---|---|---|---|---|---|---
Style #1| Style #2| Style #1| Style #2| Style #1| Style #2| Min.| Max.
M3 x 0.5| IBLC| M3| 8| 8ASSY| 8.73| 4.78| 4.34| 4.57| 0.8| 3.3| 0.8| 2.48/2.59| 4.21| 0.06| 0.6
M4 x 0.7| IBLC| M4| 8| 8ASSY| 10.31| 6.35| 5.74| 5.97| 1.2| 3.3| 1.6| 3.26/3.42| 5.89| 0.16| 1.6
M5 x 0.8| IBLC| M5| 8| 8ASSY| 13.48| 7.14| 6.58| 6.86| 1.2| 3.3| 1.6| 4.15/4.34| 6.69| 0.23| 2.1
M6 x 1| IBLC| M6| 8| 8ASSY| 15.87| 8.73| 7.57| 8.26| 1.6| 3.8| 2.4| 4.95/5.15| 8.37| 0.37| 3.2

N/A – Not Available.

1. Minor diameter may be below minimum in deformed thread area.
2. Locking torque values shown apply when the mating screw has thread class of 3A for unified sizes and class 4h for metric sizes and is made from 300 series stainless steel with no additive finish. Other screws may be used, but the locking torque may not comply with the values shown.

Thru-Threaded, ITA™, ITB™ and ITC™ Inserts

• Pilot diameter and undercuts allow plastic to flow into grooves providing high pullout resistance.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

Unified| Thread Size| Type| Thread Code (1)| A

± .005

| E

Nom.

| C

± .005

| S 1

Nom.

| S 2

Nom.

| Minor Dia. Min./Max.
---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless

Steel

.060-80| ITA| ITB| ITC| 080| .125| .109| .078| .03| .03| .0475/.051
(#0-80)
.086-56| ITA| ITB| ITC| 256| .125| .156| .142| .03| .03| .067/.0737
(#2-56)
.112-40| ITA| ITB| ITC| 440| .188| .188| .171| .03| .03| .086/.0939
(#4-40)
.138-32| ITA| ITB| ITC| 632| .219| .219| .202| .03| .06| .105/.114
(#6-32)
.164-32| ITA| ITB| ITC| 832| .250| .250| .226| .05| .06| .131/.139
(#8-32)
.190-24| ITA| ITB| ITC| 024| .281| .281| .259| .05| .06| .146/.156
(#10-24)
.190-32| ITA| ITB| ITC| 032| .281| .281| .259| .05| .06| .157/.164
(#10-32)
.250-20| ITA| ITB| ITC| 0420| .375| .344| .321| .06| .09| .197/.207
(1/4-20)
.250-28| ITA| ITB| ITC| 0428| .375| .344| .321| .06| .09| .212/.220
(1/4-28)
.313-18| ITA| ITB| ITC| 0518| .469| .437| .404| .08| .09| .254/.265
(5/16-18)
.375-16| ITA| ITB| ITC| 0616| .562| .500| .466| .09| .09| .309/.321
(3/8-16)
Metric| Thread Size x Pitch| Type| Thread Code (1)| A

± 0.13

| E

Nom.

| C

± 0.13

| S 1

Nom.

| S 2

Nom.

| Minor Dia. Min./Max.
---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless

Steel

M3 x 0.5| ITA| ITB| ITC| M3| 4.77| 4.77| 4.34| 0.78| 0.78| 2.47/2.59
M4 x 0.7| ITA| ITB| ITC| M4| 6.35| 6.35| 5.74| 1.16| 1.57| 3.25/3.42
M5 x 0.8| ITA| ITB| ITC| M5| 7.13| 7.13| 6.57| 1.16| 1.57| 4.15/4.34
M6 x 1| ITA| ITB| ITC| M6| 9.53| 8.74| 8.15| 1.57| 2.38| 4.94/5.16
M8 x 1.25| ITA| ITB| ITC| M8| 11.91| 11.1| 10.26| 2.03| 2.28| 6.68/6.92
M10 x 1.5| ITA| ITB| ITC| M10| 14.27| 12.7| 11.84| 2.38| 2.38| 8.55/8.67

Thru-Threaded, Knurled, STKA™, STKB™ and STKC™ Inserts

• Uniform knurl diameter reduces the risk of sink marks.
• Available in varying lengths for injection molding assemblies.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

Unified| Thread Size| Type| Thread Code (1)| Length Code “L” ± .005 in 32nds of an Inch| E

Nom.

| Minor Dia. Min./Max.|
---|---|---|---|---|---|---|---
Aluminum| Brass| Stainless

Steel

|
.125| .187| .250| .312| .375| .500| .625| .750|
.086-56

(#2-56)

| STKA| STKB| STKC| 256| 4| 6| 8| 10| 12| 16| —| —| .156| .067/.0737|
.112-40

(#4-40)

| STKA| STKB| STKC| 440| 4| 6| 8| 10| 12| 16| —| —| .188| .086/.0939|
.138-32

(#6-32)

| STKA| STKB| STKC| 632| 4| 6| 8| 10| 12| 16| 20| 24| .219| .105/.114|
.164-32

(#8-32)

| STKA| STKB| STKC| 832| 4| 6| 8| 10| 12| 16| 20| 24| .250| .131/.139|
.190-32

(#10-32)

| STKA| STKB| STKC| 032| 4| 6| 8| 10| 12| 16| 20| 24| .281| .157/.164|
.250-20 (1/4-20)| STKA| STKB| STKC| 0420| 4| 6| 8| 10| 12| 16| 20| 24| .375| .197/.207|
.313-18 (5/16-18)| STKA| STKB| STKC| 0518| 4| 6| 8| 10| 12| 16| 20| 24| .437| .254/.265|
.375-16 (3/8-16)| STKA| STKB| STKC| 0616| 4| 6| 8| 10| 12| 16| 20| —| .500| .309/.321|
Metric| Thread Size x Pitch| Type| Thread Code (1)| Length Code “L” ±0.13 in millimeters| E

Nom.

| Minor Dia. Min./Max.
---|---|---|---|---|---|---
Aluminum| Brass| Stainless

Steel

M3 x 0.5| STKA| STKB| STKC| M3| 3| 4| 6| 8| 10| 12| 15| 18| 4.74| 2.47/2.59
M4 x 0.7| STKA| STKB| STKC| M4| 3| 4| 6| 8| 10| 12| 15| 18| 6.35| 3.25/3.42
M5 x 0.8| STKA| STKB| STKC| M5| 3| 4| 6| 8| 10| 12| 15| 18| 7.13| 4.15/4.34

Performance Data For Molded-In Inserts

IBA, IBB and IBC Inserts(1)

1. The values reported are high and low ranges when all installation specifications and procedures are followed. Variations in mounting hole size, workpiece material and installation procedure will affect results. Performance testing of this product in your application is recommended. Samples can be provided for this purpose.

Hexagonal, NFPA™ and NFPC™ Inserts

• Press-fit insert provides strong, reusable threads. No heat or ultrasonics required.
• Hexagonal “barbed” configuration ensures high torque-out and pullout values.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

Unified| Thread Size| Type| Thread Code| A

Max.

| Min. Material Thickness| Hole Size in Material

+ .003 – .000

| C

Max.

| E

Nom.

| Min. Boss Dia.| Min. Depth Full Thread H (1)
---|---|---|---|---|---|---|---|---|---|---
Aluminum| Stainless

Steel

.086-56| NFPA| NFPC| 256| .230| .240| .187| .186| .187| .500| .212
(#2-56)
.112-40| NFPA| NFPC| 440| .230| .240| .187| .186| .187| .500| .212
(#4-40)
.138-32| NFPA| NFPC| 632| .230| .240| .187| .186| .187| .500| .212
(#6-32)
.164-32| NFPA| NFPC| 832| .265| .275| .250| .249| .250| .625| .248
(#8-32)
.190-24| NFPA| NFPC| 024| .265| .275| .250| .249| .250| .625| .248
(#10-24)
.190-32| NFPA| NFPC| 032| .265| .275| .250| .249| .250| .625| .248
(#10-32)
.250-20| NFPA| NFPC| 0420| .315| .328| .312| .311| .312| .750| .300
(1/4-20)
.313-18| NFPA| NFPC| 0518| .365| .380| .375| .374| .375| .950| .345
(5/16-18)
Metric| Thread Size x Pitch| Type| Thread Code| A

Max.

| Min. Material Thickness| Hole Size in Material

+ 0.08

| C

Max.

| E

Nom.

| Min. Boss Dia.| Min. Depth Full Thread H (1)
---|---|---|---|---|---|---|---|---|---|---
Aluminum| Stainless Steel
M2.5 x 0.45| NFPA| NFPC| M2.5| 5.84| 6.1| 4.75| 4.72| 4.75| 12.7| 5.38
M3 x 0.5| NFPA| NFPC| M3| 5.84| 6.1| 4.75| 4.72| 4.75| 12.7| 5.38
M3.5 x 0.6| NFPA| NFPC| M3.5| 5.84| 6.1| 4.75| 4.72| 4.75| 12.7| 5.38
M4 x 0.7| NFPA| NFPC| M4| 6.73| 6.99| 6.35| 6.32| 6.35| 15.88| 6.3
M5 x 0.8| NFPA| NFPC| M5| 6.73| 6.99| 6.35| 6.32| 6.35| 15.88| 6.3
M6 x 1| NFPA| NFPC| M6| 8| 8.33| 7.92| 7.89| 7.92| 19.05| 7.62
M8 x 1.25| NFPA| NFPC| M8| 9.27| 9.65| 9.53| 9.50| 9.53| 24.13| 8.76

Thru-Threaded, PPA™ and PPB™ Inserts

• Press-fit insert with strong, reusable threads.
  No heat or ultrasonics required.

• Slotted insert compresses allowing easy access into the mounting hole.

• Aluminum inserts ideal for light weight designs.

• Aluminum inserts offer lead-free alternative.

Unified| Thread Size| Type| Thread Code (1)| Length Code| A

± .005

| E

Nom.

| B

± .015

| S

Nom.

| W

± .015

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Min. Hole

Depth

| Hole Dia.

± .002

.086-56

(#2-56)

| PPA| PPB| 256| 1| .156| .134| .040| .115| .020| .196| .125
.112-40

(#4-40)

| PPA| PPB| 440| 1| .188| .169| .045| .140| .020| .228| .156
2| .250| .060| .190| .290
.138-32

(#6-32)

| PPA| PPB| 632| 1| .250| .200| .060| .190| .031| .290| .188
2| .313| .075| .235| .353
.164-32

(#8-32)

| PPA| PPB| 832| 1| .250| .231| .060| .190| .047| .290| .219
2| .313| .075| .235| .353
.190-24

(#10-24)

| PPA| PPB| 024| 2| .375| .263| .090| .280| .062| .415| .250
.190-32

(#10-32)

| PPA| PPB| 032| 1| .313| .263| .075| .235| .062| .353| .250
2| .375| .090| .280| .415
.250-20 (1/4-20)| PPA| PPB| 0420| 1| .438| .332| .105| .330| .078| .478| .313
2| .500| .120| .375| .540
Metric| Thread Size x Pitch| Type| Thread Code (1)| Length Code| A

± 0.13

| E

Nom.

| B E

± 0.4

| S

Nom.

| W

± 0.4

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Min. Hole

Depth

| Hole Dia.

± 0.05

M3 x 0.5| PPA| PPB| M3| 1| 4.77| 4.29| 1.14| 3.56| 0.5| 5.79| 3.96
2| 6.35| 1.52| 4.83| 7.37
M4 x 0.7| PPA| PPB| M4| 1| 6.35| 5.87| 1.52| 4.83| 1.2| 7.37| 5.56
2| 7.95| 1.91| 5.97| 8.97
M5 x 0.8| PPA| PPB| M5| 1| 7.95| 6.68| 1.91| 5.97| 1.6| 8.97| 6.35
2| 9.52| 2.29| 7.11| 10.54
M6 x 1| PPA| PPB| M6| 1| 11.12| 8.43| 2.67| 8.38| 2| 12.14| 7.95
2| 12.7| 3.05| 9.53| 13.72

Flange-Head, PFLA™ and PFLB™ Inserts

• Press-fit insert with strong, reusable threads. No heat or ultrasonics required.
• Flange-head eliminates direct contact of plastic with mating parts.
• Slotted insert compresses allowing easy access into the mounting hole.
• Aluminum inserts ideal for light weight designs.
• Aluminum inserts offer lead-free alternative.

Unified| Thread Size| Type| Thread Code (1)| Length Code| A

± .005

| E

Nom.

| C

Nom.

| T

± .005

| B

± .010

| S

Nom.

| W

± .015

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Min. Hole Depth| Hole Dia.

± .002

.086-56

(#2-56)

| PFLA| PFLB| 256| 1| .136| .188| .135| .020| .025| .115| .020| .176| .125
.112-40

(#4-40)

| PFLA| PFLB| 440| 1| .166| .219| .166| .022| .027| .140| .020| .206| .156
2| .228| .190| .268
.138-32

(#6-32)

| PFLA| PFLB| 632| 1| .222| .250| .200| .028| .033| .190| .031| .262| .188
2| .253| .210| .293
.164-32

(#8-32)

| PFLA| PFLB| 832| 1| .246| .281| .230| .035| .040| .210| .047| .286| .219
2| .278| .235| .318
.190-32

(#10-32)

| PFLA| PFLB| 032| 1| .270| .313| .262| .043| .048| .235| .062| .310| .250
2| .332| .280| .372
.250-20 (1/4-20)| PFLA| PFLB| 0420| 1| .388| .375| .335| .050| .055| .330| .078| .428| .313
2| .450| .375| .490
Metric| Thread Size x Pitch| Type| Thread Code (1)| Length Code| A

± 0.13

| E

Nom.

| C

Nom.

| T

± 0.13

| B

± 0.25

| S

Nom.

| W

± 0.4

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Min. Hole Depth| Hole Dia.

± 0.05

M3 x 0.5| PFLA| PFLB| M3| 1| 4.22| 5.56| 4.22| 0.56| 0.69| 3.56| 0.5| 5.24| 3.96
2| 5.8| 4.83| 6.82
M4 x 0.7| PFLA| PFLB| M4| 1| 6.25| 7.14| 5.84| 0.89| 1.02| 5.33| 1.14| 7.27| 5.56
2| 7.06| 5.97| 8.08
M5 x 0.8| PFLA| PFLB| M5| 1| 6.86| 7.95| 6.65| 1.09| 1.22| 5.97| 1.6| 7.88| 6.35
2| 8.43| 7.11| 9.45
M6 x 1| PFLA| PFLB| M6| 1| 9.86| 9.53| 8.51| 1.27| 1.40| 8.38| 2| 10.88| 7.95
2| 11.43| 9.53| 12.45

Straight Knurl, PKA™ and PKB™ Inserts

• Press-fit insert with strong, reusable threads. No heat or ultrasonics required.
• Straight knurls at the top end of the insert offers higher torsional resistance.
• Slotted insert compresses allowing easy access into the mounting hole.
• Aluminum inserts ideal for light weight designs.
• Aluminum inserts offer lead-free alternative.

Unified| Thread Size| Type| Thread Code (1)| A

± .005

| E

Nom.

| C

± .010

| B 1

± .010

| B 2

± .010

| S

Nom.

| W

± .015

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Min. Hole

Depth

| Hole Dia.

± .002

.086-56

(#2-56)

| PKA| PKB| 256| .125| .125| .110| .037| .053| .095| .020| .165| .125
.112-40

(#4-40)

| PKA| PKB| 440| .188| .156| .137| .056| .079| .140| .020| .228| .156
.138-32

(#6-32)

| PKA| PKB| 632| .250| .188| .165| .075| .105| .190| .031| .290| .188
.164-32

(#8-32)

| PKA| PKB| 832| .312| .219| .196| .094| .131| .235| .047| .352| .219
.190-32

(#10-32)

| PKA| PKB| 032| .375| .250| .234| .112| .158| .280| .062| .415| .250
.250-20 (1/4-20)| PKA| PKB| 0420| .500| .312| .291| .150| .210| .375| .078| .540| .312
Metric| Thread Size x Pitch| Type| Thread Code (1)| A

± 0.13

| E

Nom.

| C

± 0.25

| B 1

± 0.25

| B 2

± 0.25

| S

Nom.

| W

± 0.4

| Hole Size in Material
---|---|---|---|---|---|---|---|---|---|---|---
Aluminum| Brass| Min. Hole

Depth

| Hole Dia.

± 0.05

M3 x 0.5| PKA| PKB| M3| 4.78| 3.96| 3.48| 1.42| 2.01| 3.56| 0.5| 5.8| 3.96
M4 x 0.7| PKA| PKB| M4| 7.92| 5.56| 4.98| 2.39| 3.33| 5.97| 1.19| 8.94| 5.56
M5 x 0.8| PKA| PKB| M5| 9.53| 6.35| 5.94| 2.84| 4.01| 7.11| 1.57| 10.55| 6.35
M6 x 1| PKA| PKB| M6| 12.7| 7.92| 7.39| 3.81| 5.33| 9.53| 1.98| 13.72| 7.92

Performance Data For Press-In Inserts

The values reported are averages when all installation specifications and procedures are followed. Variations in mounting hole size, work piece material and installation procedure will affect results. Performance testing of this product in your application is recommended. Samples can be provided for this purpose.

If necessary our applications engineering department can assist you to design a custom component to satisfy your requirements. Below are a few examples.

Thin Sheet Studs
Provide external threads in material as thin as .125” / 3.175 mm. SI® studs are available in lengths from 1/4” to 3/4” / 6.35 to 19.05 mm in thread sizes

4-40 to 1/4-20 / M3 to M6. These inserts can be provided in aluminum, brass,

steel and stainless steel and can be pressed into pre-molded or drilled holes.

Self-Locking Ultrasonic Inserts
The self-locking feature prevents screw loosening and is advantageous in applications where vibration is present. They are available in thread sizes

2-56 to 1/4-20 / M2 to M6 and are designed for ultrasonic installation into

straight or tapered holes.

Ultrasonic Studs
Tapered body provides easy insertion in pre-molded or drilled holes. They are available in lengths from 1/4” to 3/4” / 6.35 to 19.05 mm in thread sizes

2-56 to 1/4-20 / M2 to M6. These inserts can be provided in aluminum, brass,

steel and stainless steel.

Press-In Studs
Allows for mounting a component on external threads. Available in lengths from 3/16” to 1” / 4.76 to 25.4 mm. Thread sizes #4-40 to 1/4-20 / M3 to M6. SI® press-in studs are available in aluminum, brass, steel and stainless steel and can be installed into pre-molded or drilled holes without the use of heat or ultrasonics.

PEM® Varimount® Bonding Fasteners

• Laminate within composite layers.
• Mold into plastics.
• Surface bond to panels from front or back side.
• Available with studs, nuts, or standoffs to meet a variety of applications.
• Thinner walls and bosses may be used but will affect performance.
• Pullout is the force required to pull the insert from the sheet.
• Torque-out is the torque required to turn the fastener in the parent material after installation without inducing clamp load on the fastener.

Proper installation for SI® brand inserts

Mating Component
To prevent jack-out, it is very important that the clearance hole of the mating component is sized correctly. The clearance hole should be larger than the assembly screw, yet smaller than the outside diameter of the insert so that the insert, not the host plastic, carries the compressive load. If the clearance hole must be oversized for misalignment purposes, a headed insert is recommended to increase the insert bearing area surface.

The diameter of the clearance hole in the mating component is very important. The insert and not the plastic must carry the load. The hole in the mating component must be larger than the outside diameter of the assembly screw, but smaller than the pilot or face diameter of the insert. This prevents jack-out. If a larger hole in the mating component is required for alignment purposes, a headed insert should be considered. Inserts should be installed flush (or no more than 0.13 mm (.005″) above the hole).

All specifications in this bulletin are presented as accurately and up-to-date as possible. We reserve the right to make changes to any information contained in this bulletin without notice.
We recommended that you test a particular product to be sure it is ideally suited to your application. We will be happy to provide samples for this purpose and our authorized distributors can also help you with your selection.
All PEM® products meet our stringent quality standards. If you require additional industry or other specific quality certifications, special procedures and/or part numbers are required. Please contact your local sales office or representative for further information.
Regulatory compliance information is available in Technical Support section of our website. Specifications subject to change without notice.
See our website for the most current version of this bulletin.

North America: Danboro, Pennsylvania USA | E-mail: info@pemnet.com | Tel: +1-215-766-8853 | 800-237-4736 (USA) Europe: Galway, Ireland | E-mail: europe@pemnet.com | Tel: +353-91-751714
Asia/Pacific: Singapore | E-mail: singapore@pemnet.com | Tel: +65-6-745-0660
Shanghai, China: E-mail: china@pemnet.com | Tel: +86-21-5868-3688
Visit our PEMNET™ Resource Center at www.pemnet.com • Technical support e-mail: techsupport@pemnet.com

References

• PEM - PennEngineering | Homepage

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