Jet JET-125 User Manual



Pneumatic 3/8” Impact Wrench

#505125, JAT-125

Operation & Parts Manual

M-505125

Edition 1

05/2019

JET

427 New Sanford Road

LaVergne, TN 37086

Ph.: 800-274-6848

www.jettools.com

Copyright © 2019 JET

IMPORTANT SAFETY INSTRUCTIONS

General air tool warnings

1. Read and understand this entire manual
before attempting assembly or operation.

2. Read and understand all warnings posted on
the tool and in this manual. Failure to comply
with all of these warnings may cause serious
injury.

3. Replace warning labels if they become
obscured or removed.

4. Do not use this tool for other than its intended
use. If used for other purposes, JET disclaims
any real or implied warranty and holds itself
harmless from any injury that may result from
that use.

5. Always wear approved safety glasses or face
shield while using this tool. (Everyday
eyeglasses only have impact resistant lenses;
they are not safety glasses.)

6. Wear ear protectors (plugs or muffs) if the
noise exceeds safe levels.

7. Wear gloves and protective clothing if
operation produces sparks or flying particles.
Gloves should be tight-fitting, without frayed
fingers or hanging threads. Keep hands and
body away from the working area of tool.

8. Do not operate an air tool continually at full
throttle without a work load on the tool.

9. The air tool must be properly lubricated before
operating.

10. Never start a percussion type air tool (chipper,
breaker, buster, etc.) without securing the
tooling in the retainer and placing the tip
against the work surface.

11. Do not operate air tool without its guards in
place. Do not modify the tool.

12. Do not operate this tool while tired or under
the influence of drugs, alcohol, or any
medication.

13. Adopt a comfortable posture with proper
balance, and maintain secure footing at all
times. Non-slip footwear or anti-skid floor
strips are recommended.

14. Do not wear loose clothing or jewelry. Confine
long hair.

15. Excessive air pressure and too much free
rotation may decrease life of the tool and may
cause a hazardous situation.

16. Check air hoses for wear, and keep them
away from heat and sharp edges. Repair or
replace damaged air hose immediately. Do
not carry tool by the air hose.

17. Air hose may cause tripping hazards; keep
hose away from traffic areas.

18. Do not use this tool near flammable objects,
or in potentially explosive environments. Do
not use near live electrical wires.

19. Do not use power tools in damp or wet
location, or expose them to rain. Keep work
area well lighted.

20. Do not leave a connected tool unattended.
When not in use, disconnect tool from air
source.

21. Shut off air supply and discharge any residual
pressure from tool before removing hose,
making adjustments, changing accessories,
or storing tool.

22. Make sure tool is switched off, and your finger
off the trigger, before connecting to air supply.

23. Remove adjusting keys and wrenches before
turning on tool.

2 JAT-125 Impact Wrench



24. Keep visitors a safe distance from the work
area. Keep children away.

25. Give your work undivided attention. Looking
around, carrying on a conversation and
“horse-play” are careless acts that can result
in serious injury.

26. Do not force a tool or attachment to do a job
for which it was not designed. The right tool
will do the job better and more safely.

27. Repetitive motions and/or exposure to
constant vibration can be harmful to hands
and arms. Take frequent breaks and relax
hands during extended operation. Change
posture to avoid discomfort or fatigue.

28. Compressed air can be harmful if directed
toward sensitive areas of the body, and may
propel small particles caught in the air stream.
Exercise proper caution.

29. Use only recommended accessories;
improper accessories may be hazardous.

30. Maintain tools with care. Keep air tool clean
and oiled for best and safest performance.

31. Do not use combustible gases, carbon
dioxide, oxygen or any bottled gas as an air
source for the tool. These can present risk of
explosion and serious injury.

32. Do not lubricate the tool with combustible
liquids, such as kerosene, diesel or jet fuel.

33. Do not dispose of this tool with normal
household waste. Never dispose of the air tool
into fire.

Specific warnings for Impact Wrench

34. This impact wrench is designed for removing
and installing threaded fasteners. If you are
not familiar with the proper and safe operation
of a pneumatic impact wrench, do not use until
proper training and knowledge have been
obtained.

35. Use only impact sockets in good condition.
Sockets in poor condition may reduce impact
power, and could break, creating a safety
hazard.

36. Use only sockets designated for use with
impact wrenches. Never use hand tool
sockets, as they can shatter.

37. Never hold socket, drive or drive extension
with your hand during operation.

38. Make sure workpiece is secure and will not
shift while operating impact wrench. Do not
hold workpieces with your hand.

39. Make sure fastener can withstand rated
torque of impact wrench.

WARNING: This product can expose you
to chemicals including lead which is known to
the State of California to cause cancer and
birth defects or other reproductive harm. For
more information go to http://www.
p65warnings.ca. gov.

WARNING: Some dust, fumes and gases
created by power sanding, sawing, grinding,
drilling, welding and other construction
activities contain chemicals known to the State
of California to cause cancer and birth defects
or other reproductive harm. Some examples of
these chemicals are:

 lead from lead based paint
 crystalline silica from bricks, cement and

other masonry products

 arsenic and chromium from chemically

treated lumber
Your risk of exposure varies, depending on
how often you do this type of work. To reduce
your exposure to these chemicals, work in a
well-ventilated area and work with approved
safety equipment, such as dust masks that are
specifically designed to filter out microscopic
particles. For more information go to
http://www.p65warnings.ca.gov/ and http://
www.p65warnings.ca.gov/wood.

Familiarize yourself with the following safety
notices used in this manual:

This means that if precautions

are not heeded, it may result in serious, or even
fatal, injury.

This means that if precautions

are not heeded, it may result in minor injury
and/or possible tool damage.

JET 3



About this manual

This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model
JAT-125 Pneumatic Impact Wrench. This manual contains instructions on safety precautions, general
operating procedures, maintenance procedures and parts breakdown. Your tool has been designed and
constructed to provide consistent, long-term operation if used in accordance with the instructions set forth
in this document.

The instructions and warnings in this manual may not encompass all possible workplace environments. The
operator is expected to take appropriate precautions and exercise common sense. As with any tool
operation, safety of operator and bystanders should be first priority.

If there are questions or comments, please contact your local supplier or JET. JET can also be reached at
our web site: www.jettools.com.

Record the serial number and purchase information of your tool on the cover of this manual for quick access.
Retain this manual for future reference. If the tool transfers ownership, the manual should accompany it.

Register your product using the mail-in card provided, or register online:

http://www.jettools.com/us/en/service-and-support/warranty/registration/

4 JAT-125 Impact Wrench



Tool specifications

Model

Stock number 505125

Square drive 3/8 in.

Bolt capacity 3/4 in. (M20)

Anvil retainer type Ring

Impact mechanism Jumbo hammer

Maximum torque 430 lbf•ft (583 N•m)

Working torque

Free speed 8500 RPM

Blows per minute 1,500

Air consumption at 90psi 27.05 SCFM

Air consumption under load 19.32 SCFM

Air inlet 1/4 in. NPT

Air hose inside diameter 3/8 in.

Required air pressure 90 psi (621 kPa)

Vibration value 9.62 m/s2

Sound power 1 113.6 dB(A)

Sound pressure 1 102.6 dB(A)

Grip Pistol style

Overall Length 4.40 in. (111.76 mm)

Housing material Composite

Net weight 2.5 lb. (1.13 kg)

Shipping weight 2.63 lb. (1.19 kg)

JAT-125 Impact Wrench

90~370 lbf•ft
(122~501.65 N•m)

1

The specified values are emission levels and are not necessarily to be seen as safe operating levels. As
workplace conditions vary, this information is intended to allow the user to make a better estimation of the
hazards and risks involved only.

Specifications were current at time of publication, but because of our policy of continuous improvement, JET
reserves the right to change specifications at any time and without prior notice, without incurring obligations.

JET 5

