Precisebuilt 2775 Professional Torque Wrench Instruction Manual
- June 4, 2024
- Precisebuilt
Table of Contents
Dual-Direction Click
Professional Torque Wrench
OPERATING INSTRUCTIONS
MICRO-ADJUSTING TORQUE WRENCH
OPERATING INSTRUCTIONS
- STUDY THIS BOOKLET CAREFULLY BEFORE OPERATING THIS WRENCH.
- NEVER APPLY MORE TORQUE THAN THE MAXIMUM SCALE READING.
- This Torque Wrench is designed for manual tightening of threaded fasteners only. DO NOT USE IT AS A NUT-BREAKER OR FOR ANY OTHER PURPOSE.
- ALWAYS USE APPROVED EYE PROTECTION WHEN USING TOOLS.
- This wrench will not prevent you from applying more torque than set. IT IS NOT A TORQUE-LIMITING TOOL. Learn how different amounts of torque ‘′feel’′ so you will reduce the possibility of damage and/or injury due to accidental over-torquing.
- There are no user-serviceable components inside the wrench. Disassembling the wrench or making any adjustments will result in the loss of accuracy,
- THIS IS A PRECISION MEASURING INSTRUMENT. CALIBRATION AND SERVICING MUST BE DONE REGULARLY AND IS THE OWNER’S RESPONSIBILITY.
TORQUE SETTING
| | |
---|---|---|---
PUSH COLLAR TOWARD
RATCHET HEAD TO
“UNLOCK” | TURN THE HANDLE CLOCKWISE TO
INCREASE THE TORQUE| TURN THE HANDLE
CCW TO DECREASE
THE TORQUE| PULL COLLAR TOWARD
HANDLE TO “LOCK”
- Push collar toward ratchet head to “UNLOCK”
- Turn the handle Clockwise or Counterclockwise(Right or Left) to set the desired torque.
- Pull the collar toward the handle to “LOCK”
EXAMPLES OF TORQUE SETTINGS
To set the torque to 83 ft. lbs. turn the handle clockwise until the edge of
the minor scale is even with the line marking “80” on the major scale and the
“0 ft.lb.” mark on the minor scale is centered as shown in fig. 1 below. Then,
continue turning the handle clockwise until the “3 ft.lb.” mark is centered as
shown in fig.2.
- Various models and capacities of wrenches are illustrated. Though they might be different from your particular wrench, the principle of obtaining scale reading is the same.
** By necessity, metric scales are not calibrated in even numbers. Consequently, when using Metric scales, set the wrench at a reading closest to the desired torque.
- Various models and capacities of wrenches are illustrated. Though they might be different from your particular wrench, the principle of obtaining scale reading is the same.
** By necessity, metric scales are not calibrated in even numbers. Consequently, when using Metric scales, set the wrench at a reading closest to the desired torque.
APPLYING TORQUE
- Set desired torque
- Attach the socket to the ratchet head. Set directional switch.
- Apply the load at the center of the handle until you hear a “CLICK”, IMMEDIATELY RELEASE THE LOAD. The torque wrench will reset itself for the next operation.
WARNING
- Do not set torque below the lowest scale.
- Do not apply more torque than max. scale.
- Do not continue applying torque when preset torque has been reached (audible “Click”).
CAUTION
- Threads on bolts, nuts, and other mating components should be clean and smooth. A lubricant applied to the threads and under the head of bolts will produce more accurate and consistent results.
- Never torque a fastener that is already tightened. Loosen it first, then re-torque to the desired value. The same applies to fasteners that are over-torqued.
- When tightening many fasteners holding one component (engine head, pipe flanges, etc.) follow the manufacturer’s recommended procedures. If such procedures are not available, torque in a criss-cross manner first 60-70% of the desired torque, then the final torque.
- D0 does NOT apply more torque than the rated capacity of the torque wrench. Do not use it as a nut-breaker!!
EXTENSIONS
When attaching an adaptor, the torque applied by the extension to the fastener
is always more than the torque setting on the wrench. Follow the formulas
below to correct torque settings.
A – Torque applied by extension to the fastener.
R – Torque Set on the wrench.
L – Lever length (from the center of the handle to the center of the ratchet
head drive).
E – Extension length (from center Ratchet head drive to the center of socket
or fastener).
Example: If you desire 50 ft. lbs at the end of the adaptor (A) then the torque setting on the wrench (R) is calculated as follows:
Where: L = 16 inches
E = 2 inches
R = 44.44 ft. lbs
R = 50 ( 16 /( 16 + 2))
R = 50 ( 16 / 18 )
R = 50 X 0.8888
The torque setting on the wrench is 44.44 ft-lbs (the formula above is
applicable for the in-line adapters only)
NOTE
Any length of extension can be used. When the adaptor is attached
perpendicular to the axis of the wrench the torque setting on the wrench is
equal to the torque on the fastener.
NOTE:
- Regular (concentric) socket extensions which extend directly under the drive head along the axis of the drive do not affect the calibration of the Torque Wrench.
- A handle extension (a piece of pipe extending the handle’s length) MUST NOT BE USED under any circumstance. Their use will result in erroneous torque readings and may damage the grip or the adjusting mechanism. While applying torque, the wrench should be held ONLY BY THE GRIP. At high torque readings, if both hands are necessary to apply enough pressure to operate the wrench, hold the grip in one hand, and put the other hand on the top of the first hand, never on the wrench body.
GENERAL TORQUE SPECIFICATION CHART FOR ENGLISH FASTENERS (in Foot Pounds)*
N MATERIAL OR GRADE
BOLT SIZE| SAE 2
(Mild k II Steel)| SAE 5| SAE 8| SOCKET
HEAD CAP
SCREWS| BRASS| Stainless AISI
TYPE 303
---|---|---|---|---|---|---
1/4/20| 6| 11| 12| 13| 5| 5
1/4/28| 7| 13| 15| 16| 6| 7
5/16/18| 13| 21| 25| 27| 8| 9
5/16/24| 14| 23| 30| 33| 9| 10
3/8/16| 23| 38| 50| 52| 15| 17
3/8/24| 26| 40| 60| 60| 16| 18
7/16/14| 37| 55| 85| 86| 23| 25
7/16/20| 41| 60| 95| 95| 25| 28
1/2/13| 57| 85| 125| 130| 32| 37
1/2/20| 64| 95| 140| 145| 34| 40
9/16/12| 80| 125| 175| 180| 44| 50
9/16/18| 91| 140| 195| 210| 48| 54
5/8/11| 111| 175| 245| 255| 68| 75
5/8/18| 128| 210| 270| 290| 73| 80
3/4/10| 180| 300| 425| 410| 104| 115
3/4/16| 200| 330| 460| 445| 115| 125
7/8-9| 275| 450| 660| 580| 155| 170
7/8/14| 300| 490| 700| 615| 170| 185
1″-8| 415| 680| 990| 830| 235| 260
1″-14| 435| 715| 1050| 880| 250| 270
GENERAL TORQUE SPECIFICATION CHART FOR METRIC FASTENERS (in Newton Meters)*
MATERIAL CLASS
BOLT DIAM| 5.| 5.| 6.| 9.| 10.| 11.| 13.
---|---|---|---|---|---|---|---
MM| INCH
5| 0.| 3| 4| 5| 7| 8| 11| 12
6| 0.| 5| 6| 8| 13.| 14| 17| 20
6.| 0.| 6.| 8| 10.| 14| 16| 21| 24
8| 0.| 12| 16| 20| 30| 34| 44| 50
10| 0.| 23| 32| 40| 60| 70| 85| 100
12| 0.| 40| 56| 70| 103| 120| 150| 180
14| 1.| 65| 90| 110| 167| 190| 240| 280
16| .630| 100| 140| 170| 270| 290| 380| 440
18| 1.| 137| 177| 225| 350| –| 480| 580
20| 1.| 200| –| 330| 520| –| 740| 860
*These torque values are approximate and should not be accepted as accurate limits. Indeterminant factors (surface finish, type of plating, and lubrication in specific applications preclude the publication of accurate values for universal use. Manufacturers of various types of equipment usually provide specific tightening instructions which should be followed. DO NOT USE the above values for gasket joints or joints of soft materials, DO NOT USE your torque wrench for values greater than its maximum scale reading.
CARE AND MAINTENANCE
- A Torque Wrench is a precision instrument and should be handled and stored with care. Do not throw it around, hammer with it, or use it as a prybar.
- The wrench is lubricated for life and should not be oiled. The only exception is the ratchet head which may be lubricated as needed for smooth operation.
- The plastic grip is not affected by petroleum products but may be damaged by some industrial solvents. Clean with a clean cloth soaked in mineral spirits or denatured alcohol. NEVER IMMERSE THE WRENCH OR ANY PORTION OF IT IN ANY LIQUID!
- This is a precision measuring instrument. Calibration and servicing must be done regularly and is the owner’s RESPONSIBILITY.
TORQUE UNIT CONVERSION
MULTIPLY NUMBER OF
TO OBTAIN| Inch Ounces| Inch Pounds| Foot Pounds| Newton Meters
---|---|---|---|---
Inch Ounces| 1| 16| 192| 141.6
Inch Pounds| .0625¹| 1| 12| 8.851
Foot Pounds| .005208| .08333²| 1| .7376
Newton- Meters| .007061| .1130| 1.356| 1
¹or divide by 16
²or divide by 12
CERTIFICATION
This torque wrench is certified to have been calibrated prior to shipment
to the accuracy of ± 4% in the right-hand direction, and ± 6% in the left-hand
direction on readings of 20% to 100% of capacity. On readings below 20% of
capacity, the accuracy is ± two minor scale increments.
Visit our website at: http://precisebuilt.com
Email our technical support at:
productsupport@precisebuilt.com
Printed in Taiwan
References
Read User Manual Online (PDF format)
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