SMC KFG2-F Series FDA compliant Stainless Steel 316 Insert Fitting Instruction Manual

Operation Manual
PRODUCT NAME 
FDA compliant Stainless Steel 316 Insert Fitting
MODEL/ Series/ Product Number
KFG2-F series
SMC Corporation

FDA compliant
KFG2 Series Stainless Steel 316 Insert Fitting
Safety Instructions

These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.”
They are all important notes for safety and must be followed in addition to International Standards (ISO/IEC)1), and other safety regulations.
1) ISO 4414: Pneumatic fluid power — General rules relating to systems.
ISO 4413: Hydraulic fluid power — General rules relating to systems.
IEC 60204-1: Safety of machinery — Electrical equipment of machines.(Part 1: General requirements)
ISO 10218: Manipulating industrial robots -Safety.
etc.

Caution
Caution indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury.
Warning
Warning indicates a hazard with a medium level of risk which, if not avoided, could result in death or serious injury.
Danger
Danger indicates a hazard with a high level of risk which, if not avoided, will result in death or serious injury.

Warning

1. The compatibility of the product is the responsibility of the person who designs the equipment or decides its specifications.
   Since the product specified here is used under various operating conditions, its compatibility with specific equipment must be decided by the person who designs the equipment or decides its specifications based on necessary analysis and test results.
   The expected performance and safety assurance of the equipment will be the responsibility of the person who has determined its compatibility with the product.
   This person should also continuously review all specifications of the product referring to its latest catalog information, with a view to giving due consideration to any possibility of equipment failure when configuring the equipment.

2. Only personnel with appropriate training should operate machinery and equipment.
   The product specified here may become unsafe if handled incorrectly.
   The assembly, operation, and maintenance of machines or equipment including our products must be performed by an operator who is appropriately trained and experienced.

3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
   1. The inspection and maintenance of machinery/equipment should only be performed after measures to prevent falling or runaway of the driven objects have been confirmed.
   2. When the product is to be removed, confirm that the safety measures as mentioned above are implemented and the power from any appropriate source is cut, and read and understand the specific product precautions of all relevant products carefully.
   3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.

4. Contact SMC beforehand and take special consideration of safety measures if the product is to be used in any of the following conditions.
   1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to direct sunlight.
   2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping, vehicles, military, medical treatment, combustion, and recreation, or equipment in contact with food and beverages, emergency stop circuits, clutch, and brake circuits in press applications, safety equipment or other applications unsuitable for the standard specifications described in the product catalog.
   3. An application that could have negative effects on people, property, or animals requiring special safety analysis.
   4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a mechanical protective function, and periodical checks to confirm proper operation.

FDA compliant
KFG2 Series Stainless Steel 316 Insert Fitting
Safety Instructions

These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.”
They are all important notes for safety and must be followed in addition to International Standards (ISO/IEC)1) , and other safety regulations.
1) ISO 4414: Pneumatic fluid power — General rules relating to systems.
ISO 4413: Hydraulic fluid power — General rules relating to systems.
IEC 60204-1: Safety of machinery — Electrical equipment of machines.(Part 1: General requirements)
ISO 10218: Manipulating industrial robots -Safety.
etc.

Caution
Caution indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury.
Warning
Warning indicates a hazard with a medium level of risk which, if not avoided, could result in death or serious injury.
Danger
Danger indicates a hazard with a high level of risk which, if not avoided, will result in death or serious injury.

Warning

1. The compatibility of the product is the responsibility of the person who designs the equipment or decides its specifications.
   Since the product specified here is used under various operating conditions, its compatibility with specific equipment must be decided by the person who designs the equipment or decides its specifications based on necessary analysis and test results.
   The expected performance and safety assurance of the equipment will be the responsibility of the person who has determined its compatibility with the product.
   This person should also continuously review all specifications of the product referring to its latest catalog information, with a view to giving due consideration to any possibility of equipment failure when configuring the equipment.

2. Only personnel with appropriate training should operate machinery and equipment.
   The product specified here may become unsafe if handled incorrectly.
   The assembly, operation, and maintenance of machines or equipment including our products must be performed by an operator who is appropriately trained and experienced.

3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
   1.The inspection and maintenance of machinery/equipment should only be performed after measures to prevent falling or runaway of the driven objects have been confirmed.
   2. When the product is to be removed, confirm that the safety measures as mentioned above are implemented and the power from any appropriate source is cut, and read and understand the specific product precautions of all relevant products carefully.
   3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.

4. Contact SMC beforehand and take special consideration of safety measures if the product is to be used in any of the following conditions.
   1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to direct sunlight.
   2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping, vehicles, military, medical treatment, combustion, and recreation, or equipment in contact with food and beverages, emergency stop circuits, clutch, and brake circuits in press applications, safety equipment or other applications unsuitable for the standard specifications described in the product catalog.
   3. An application that could have negative effects on people, property, or animals requiring special safety analysis.
   4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a mechanical protective function, and periodical checks to confirm proper operation.

FDA compliant
KFG2 Series Stainless Steel 316 Insert Fitting
Safety Instructions

Caution

1. The product is provided for use in manufacturing industries.
   The product herein described is basically provided for peaceful use in manufacturing industries.
   If considering using the product in other industries, consult SMC beforehand and exchange specifications or a contract if necessary.
   If anything is unclear, contact your nearest sales branch.

Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance Requirements”.
Read and accept them before using the product.

Limited warranty and Disclaimer

1. The warranty period of the product is 1 year in service or 1.5 years after the product is delivered, whichever is first. 2) Also, the product may have specified durability,  running distance, or replacement parts. Please consult your nearest sales branch.

2. For any failure or damage reported within the warranty period which is clearly our responsibility, a replacement product or necessary parts will be provided.
   This limited warranty applies only to our product independently, and not to any other damage incurred due to the failure of the product.

3. Prior to using SMC products, please read and understand the warranty terms and disclaimers noted in the specified catalog for the particular products.
   2) Vacuum pads are excluded from this 1 year warranty.
   A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
   Also, even within the warranty period, the wear of a product due to the use of the vacuum pad or failure due to the deterioration of rubber material are not covered by the limited warranty.

Compliance Requirements

1. The use of SMC products with production equipment for the manufacture of weapons of mass destruction (WMD) or any other weapon is strictly prohibited.
2. The export of SMC products or technology from one country to another is governed by the relevant security laws and regulations of the countries involved in the transaction. Prior to the shipment of an SMC product to another country, ensure that all local rules governing that export are known and followed.

SMC products are not intended for use as instruments for legal metrology.
Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests relevant to the metrology (measurement) laws of each country.
Therefore, SMC products cannot be used for business or certification ordained by the metrology (measurement) laws of each country.

Specific Product Precautions

Design/Selection

Warning

1. Check the specifications.
   The product in this catalog is designed to be used in compressed air systems (including vacuum) only. If the product is used in an environment where pressure or temperature is out of the specified range, damage and/or malfunction may result. (Refer to the specifications.) Please consult with SMC when using fluid other than compressed air (including vacuum). We do not guarantee against any damage if the product is used outside of the specification range.

2. Do not disassemble the product or make any modifications, including additional machining.
   It may cause human injury and/or an accident.

Caution

1. Keep the connection part of fittings and tubing from rotating or oscillating movement. The fittings may be damaged if they are used in the above manner. Especially for the swivel elbow, repeated load applied from the connected tubing may cause detachment from the stud.

2. The tubing bending radius in the vicinity of the fitting should be at least the minimum bending radius of the tubing.
   If the bending radius is less than the minimum value, fittings may be damaged, or tubing may crack or be crushed. The minimum bending radius of the FR soft nylon tubing  (TRS series), FR double layer tubing (TRB series), antistatic soft nylon tubing (TAS series), polyolefin tubing (TPH series), soft polyolefin tubing (TPS series) is measured as follows in accordance with JIS B8381. Tubing deformation ratio at the minimum bending radius is obtained through the following formula, based on tubing diameter and mandrel diameter by wrapping the same radius mandrel tube.
   Tube deformation ratio at the minimum bending radius
   

3. Do not use fluids other than listed on the specifications.
   Applicable fluids are air, water, and steam. Please consult with SMC if using other fluids.

4. When it is used with water, the fittings or tubing may be damaged depending on the surge pressure.

5. Surge pressure must be under the maximum operating pressure. If the surge pressure exceeds the maximum operating pressure, it will result in damage to fittings and tubing.

6. When using the swivel elbow, particles may be generated by rotation for positioning after connecting. If you are concerned about the effects on machinery and equipment, check the particle generation with your machine before use.

**Mounting/ Piping

**

Warning

1. Operation manual
   Install the products and operate them only after reading the operation manual carefully and understanding its contents. Also, keep the manual where it can be referred to as necessary.

2. Ensure sufficient space for maintenance activities.
   When installing the products, allow access for maintenance.

3. Adhere to the thread tightening method.
   When installing the products, refer to “Connection Thread Tightening Method”.

4. There may be cases of the tubing detaching from the fitting and thrashing around uncontrollably due to tubing degradation or fitting breakage.
   To prevent the situation from becoming uncontrollable, fit the tubing with a protective cover or fix it in place.

Caution

1. Preparation before piping
   Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to remove chips, cutting oil, and other debris from inside the pipe.

2. Winding of sealant tape
   When screwing together pipes and fittings, etc., be certain that chips from the pipe threads and sealant do not get inside the pipe. Also, when the sealant tape is used, leave approximately 1 thread ridge exposed at the end of the threads.
   Specific Product Precautions (2)
   Mounting/ Piping

3. Check the model, type, and size before installation. Also, confirm that there are no scratches, gouges, or cracks on the product.

4. When connecting the tubing, take pressure or possible changes to the tubing length into account, and allow a sufficient margin.
   Failure to do so may result in fitting breakage or detachment of the tubing. Refer to the recommended piping conditions.

5. Do not apply unnecessary forces such as twisting, pulling, moment loads, vibration and impact, etc. on fittings or tubing.
   This will cause damage to the fittings and will crush, burst or release tubing.

6. Tubing, with the exception of coiled tubing, requires stationary installation. Do not use standard tubing (non-coiled) in applications where tubing is required to travel inside the flexible protection tube. Tubing that travels may sustain abrasion, extension, or severance due to tensile force, or may result in removal of tubing from fitting. Use caution prior to use for proper application.

7. To install the fitting, screw the fitting in using the hexagonal face of the body, and tighten with an appropriate wrench. Affix the wrench at the base of the thread. If the size of the hexagonal face and wrench do not match, or tightening takes place near the tube side, it may cause collapse or deformation of the hexagonal face or damage to the equipment. After installing, confirm that there is no damage to the fitting, etc.

8. The swivel elbow rotation is only for positioning after mounting the product. It is not intended for repeated rotation or oscillation, which will cause wear, resulting in metal particles that may enter the operating fluid or cause fitting damage.

Piping Method

Caution

1. Take a tube having no flaws on its periphery and cut it off at right angles. (Use SMC’s tube cutter TK-1, 2, 3, 5, or 6 for cutting. Do not use pinchers, nippers or scissors, etc.)The tubing might be cut diagonally or flattened, making installation impossible or causing problems such as disconnection and leakage.

2. Insert the tube into the union nut with the union nut removed. Grab the tube and gently push it thoroughly into the fitting.
   

3. After insertion, tighten the union nut temporarily by hand.

4. Fix the body with a tool. Tighten the union nut to the end surface of the body using a suitable wrench.
   Hex. across flats may be deformed, if using an improper wrench for hex. across flats. If the body is not secured with a tool, this may cause breakage. (In particular, for the swivel elbow, the stud may come off).
   

5. Fix the body with a tightening tool. Tighten the union nut to the end surface of the body using a suitable wrench.
   Hex. across flats may be deformed, if using an improper wrench for hex. across flats. Tighten the union nut with the proper tightening torque shown below.

KFG2□03
KFG2□04
KFG2□06| 3 to 4
KFG2□07
KFG2□08| 5 to 6
KFG2□09
KFG2□10| 8 to 10
KFG2□11
KFG2□12| 10 to 12
KFG2□13
KFG2□16| 16 to 18

Union nut tightening direction

Specific Product Precautions (3)

Cleaning
Warning

1. Check the connection before cleaning.
   Clean the fittings whilst the tubes are connected and the screws tightened.
   Do not clean the fitting when the tube, union nut, and body are not assembled.

2. Review the conditions before cleaning.
   Make sure that the fitting material is not affected or damaged by chemical solution, temperature, and water pressure before use.

3. Do not use a metal brush or tool which damages or scratches the fitting.

Air Supply

Warning

1. Type of fluids
   Please consult with SMC when using the product in applications other than compressed air.
   Regarding products for general fluids, please contact SMC concerning applicable fluids.

2. When there is a large amount of drainage.
   Compressed air containing a large amount of condensate can cause the malfunction of pneumatic equipment. An air dryer or water droplet separator should be installed upstream from the filters.

3. Drain flushing
   If condensate in the drain bowl is not emptied on a regular basis, the bowl will overflow and this may cause the malfunction of pneumatic equipment. If the drain bowl is difficult to check and remove, installation of a drain bowl with an auto drain option is recommended.
   For details on the above-compressed air quality, refer to SMC’s Best Pneumatics catalog.

4. Use clean air.
   Do not use compressed air that contains chemicals, synthetic oils including organic solvents, salt or corrosive gases, etc., as it can cause damage or malfunction.

Caution

1. Install an air filter.
   Install an air filter at the upstream side of the valve.
   Select an air filter with a filtration degree of 5μm or finer.

2. Install an aftercooler, air dryer, or water droplet separator, etc.
   Compressed air that contains a large amount of drainage can cause malfunction of pneumatic equipment. Therefore, take appropriate measures to ensure air quality, such as by providing an aftercooler, air dryer, or water droplet separator. (3) Ensure that the fluid and ambient temperature are within the specified range. If the fluid temperature is 5 o C or less, the moisture in the circuit could freeze, causing damage to the seals and leading to equipment malfunction. Therefore, take appropriate measures to prevent freezing.

For details on the above-compressed air quality, refer to SMC’s Best Pneumatics catalog.

Operating Environment

Warning

1. Do not use in an atmosphere having corrosive gases, chemicals, seawater, water, water steam, or where there is direct contact with any of these.  Refer to each construction drawing on the fittings and tubing material.

2. Do not expose the product to direct sunlight for an extended period of time.

3. Do not use in a place subject to heavy vibration and/or shock.

4. Do not mount the product in locations where it is exposed to radiant heat.

5. Do not use ordinary fittings and tubing in locations where static electricity would be problematic.
   It may result in system failure and trouble. In such places, the use of antistatic fittings (KA series) and antistatic tubing (TA series) are recommended.

6. Do not use ordinary fittings and tubing in locations where spatter is generated.
   Spattering may result in a fire hazard. In such a place, the use of flame- resistant fittings (KR/KRM series) and flame-resistant tubing (TRS/TRB/TRBU/TRTU series) are recommended.

7. Do not use in an environment where the product is directly exposed to cutting oil, lubricant, coolant oil, etc.
   Please contact SMC if using for an environment exposed to cutting oil, lubricant, or coolant oil, etc.

8. Take note that if nylon tubing, soft nylon tubing, and antistatic tubing are used in a cleanroom.
   The antioxidant on the surface of the soft nylon tubing may come off, thereby lowering the cleanness level.

9. Do not use in environments where the foreign matter may stick to the product or get mixed in the product’s interior.
   This may cause leakage or disconnection of the tubing.
   specific Product Precautions (4)

10. The table below shows the standards that parts comply with. Please refer to the verification of the operating environment.

Maintenance

Warning

1. Perform maintenance inspections according to the procedures indicated in the operation manual.
   If handled improperly, malfunction and damage of the machinery of equipment may occur.

2. Maintenance work
   If handled improperly, compressed air can be dangerous. The assembly, handling, repair, and element replacement of pneumatic systems should be performed by a  knowledgeable and experienced person.

3. Drain flushing
   Remove drainage from air filters regularly.

4. Removal of equipment and supply/exhaust of compressed air
   When components are removed, first confirm that measures are in place to prevent workpieces from dropping, run-away equipment, etc. Then, cut off the supply pressure and electric power, and exhaust all compressed air from the system using the residual pressure release function. When the equipment is restarted, proceed with caution after confirming that appropriate measures are in place to prevent cylinders from the sudden movement.

Caution

1. Be certain to wear safety glasses at all times during periodical inspections.

2. During regular maintenance, check for the following and replace any components as necessary.
   a) Scratches, gouges, abrasion, corrosion
   b) Leakage
   c) Flattening or distortion of tubing
   d) Hardening, deterioration, or softness of tubing
   e) Loosening of the union nut

3. Do not repair the fittings or patch the tubing for reuse.

4. After operation at a high temperature, leakage may occur due to time-dependent change of the tube material. If leakage occurs, remove the tube, cut off the connecting part of the tube, and connect to the piping again.
   Check if the tube dimension accuracy is within the recommended tolerance. If it is difficult to take the tube out of the body, bend the tube to the side to remove it.

Connection Thread Tightening Method

Caution

1. Fittings with sealant: R, NPT
   First, tighten the fitting by hand, then use a wrench appropriate for the hexagon flats of the body to tighten it a further two or three turns. For a tightening torque guide, see the table below.
   If the fitting is tightened with excessive torque, the fitting may break. In particular, for the swivel elbows, the stud may come off. Connection thread sizeNPT, R1/8| Tightening torque [N・m]
   ---|---
   NPT, R1/4| 3 to 5
   NPT, R3/8| 8 to 12
   NPT, R1/2| 15 to 20

2. Insufficient tightening may cause seal failure, or loosen the threads.

3. Reuse
   Normally, fittings with a sealant can be reused 2 to 3 times.

4. Once the fitting has been tightened, backing it out to its original position often causes the sealant to become defective. Air leakage will occur.

5. Connection thread: G
   Tighten fittings with sealant using the proper tightening torques in the table below.

Chamfer Dimension for Female Thread

Caution

1. Chamfer dimension for a female thread of the connection thread
   Confirming to ISO 16030 (air pressure fluid dynamics – connection – ports and stud ends), the chamfer dimensions are shown below are recommended. By chamfering as shown in the following table, machining of threads is easier and effective for burr prevention.

Precautions for use with non-SMC

Caution

1. When using the KFG2-F series with tubing other than those from SMC, the products are not subject to warranty.

Specifications

150°C for swivel elbow and G thread]
Lubricant| NSF H1 grease
Seal on the threads| Without sealant [O-ring seal for G thread]

Note1: The surge pressure must be under the maximum operating pressure.
Note2: DI water is not recommended. DI water affects the materials used in the fitting, which may lead to a deterioration of water quality.
Note3: Consult with SMC regarding applicable tubing separately.
Note4: Avoid using in a vacuum holding application such as a leak tester, since there is leakage.
Note5: Check the operating pressure range and operating temperature range of the tube.

Applicable tubing

Tubing material Note1) Note2)| FEP, PFA, Modified PTFE, 2-layer soft fluoropolymer, Nylon, Soft nylon, Polyurethane, Soft polyurethane, Polyolefin, Soft polyolefin, Antistatic soft nylon, Antistatic polyurethane, Hard polyurethane
---|---
Tubing size| ø4xø2.5, ø4xø3, ø6xø4, ø8xø6, ø10xø7.5 ø10xø8, ø12xø9, ø12xø10, ø16xø13
ø1/8″xø0.086″, ø5/32″xø0.098″, ø1/4″xø5/32″ ø5/16″xø0.236″, ø3/8″xø1/4″, ø1/2″xø3/8″

Note1: Considering the product application, FDA-compliant products are recommended.
Note2: For soft polyurethane tubing, hard polyurethane tubing, antistatic polyurethane tubing, water cannot be used.

Table of applicable tubings (metric size)

ol6x013
TH| FEP| •| –| •| •| •| •| •| •| –
TL| Super PFA| | •| •| •| | •| | •| –
TLM| PFA| •| •| •| •| •| •| •| •| •
TD| Modified PTFE| •| | •| •| •| | •| | –
TO| Special fluoropolymer| •| –| •| •| | •| •| –|
T| Nylon| •| •| •| •| •| | •| –| •
TS| Soft nylon| •| | | •| •| –| •| –|
TU| Polyurethane| •| –| •| –| | –| | –| –
TPH| Polyolefin| •| –| •| •| •| –| •| –| –
TUS| Soft polyurethane| •| –| •| –| | –| | –| –
TUH| Hard polyurethane (High Promo))| •| –| •| –| –| –| –| –| –
TPS| Soft polyolefin| •| –| •| –| –| –| –| –| –
TAS| Antistatic soft nylon| •| –| •| –| –| –| –| –| –
TAU| Antistatic polyurethane| •| –| •| –| –| –| –| –| –

Table of applicable tubings (inch size)

01i2″X0318″
(o3.18xo2.18)| (o4xo2.5)| (o6.35xo3.95)| (o8x06)| (o9 53xo6 35)| (c12 7r.o9 53)
TI-IITH| FEP| •| •| •| •| •| •
TUTIL| Super PFA| •| | •| •| •| •
TLM..TILM| PFA| •| •| •| •| •| •
TD/TID| Modified PTFE| •| •| •| •| •| •
T/TIA| Nylon| •| •| | •| | •
TS/TISA| Soft nylon| •| •| | •| | •
TU/TIUB| Polyurethane| –| •| | | •|
TPH| Pdydefin| –| •| | •| |
TUS| Soft polyurethane| –| •| | | |
TUH| Hard polyurethane (High preEwre)| –| •| | | |
TPS| Soft polyolefin| | •| | | |
TAS| Antistatic soft nylon| –| •| | | |
TAU| Antistatic polyurethane| –| •| | | |

Spare Parts

G thread O-ring Spare Parts

FKM
G1/4| KQB2-G02-F
G3/8| KQB2-G03-F
G1/2| KQB2-G04-F

Troubleshooting

KFG2 series insert fitting cannot be disassembled or repaired in order to quality maintenance. When failure such as “Non-removable tubing” occurs, please replace the whole product.

Construction

Stainless steel
Metal exists in nature as ore (like oxide or sulfide). This means that oxide or sulfide is more stable than the pure metal. Accordingly, metallic material chemically oxidizes (metallic constituent becomes ion and melts out). It corrodes in the natural environment.
Even though corrosion of metal easily occurs in an environment where the oxidizing tendency is stronger, some kinds of metal have a characteristic for which corrosion never happens if the level of oxidizing goes higher than a specific point. In such a case, it is called “metal in the passive state”.
Stainless steel has corrosion resistance because of a thin coat of passive state on its surface. However, there does not exist stainless steel with absolute corrosion resistance; therefore, many types of stainless steel have been developed for improved corrosion resistance performance.

Revision history
A: Cleaning added

SMC Corporation
4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN
Tel: + 81 3 5207 8249 Fax: +81 3 5298 5362
URL http://www.smcworld.com
NOTE: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
© 2020 SMC Corporation All Rights Reserved

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