Pneumatic Die Grinders
#505480, JAT-480
#505481, JAT-481
#505482, JAT-482
JAT-482
JAT-481
JAT-480
Operation & Parts Manual
M-505480
Edition 2
11/2018
427 New Sanford Road
LaVergne, TN 37086
Ph.: 800-274-6848
www.jettools.com
Copyright © 2016 JET
JET
2
Safety warnings
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.
24. Keep visitors a safe distance from the work
area. Keep children away.
JAT-480,481,482 Die Grinders
3
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 Die Grinders
34. This die grinder is designed for deburring,
polishing, grinding and surface preparation. If
you are not familiar with the proper and safe
operation of a pneumatic die grinder, do not
use until proper training and knowledge have
been obtained.
35. Speed rating of tool attachment must equal or
exceed rated free speed of die grinder.
36. Make sure attachment is securely inserted
into collet and collet nut is tight.
37. Make sure workpiece is secure and will not
38. Use only attachments designed for the collet
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.
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
arsenic and chromium from chemically
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:
are not heeded, it may result in serious, or even
fatal, injury.
are not heeded, it may result in minor injury
and/or possible tool damage.
shift while operating die grinder. Do not hold
workpieces with your hand.
size of die grinder. Do not modify an
attachment or use bushings, wheel flanges,
etc., to mount an attachment of incorrect size.
WARNING: This product can expose you
WARNING: Some dust, fumes and gases
other masonry products
treated lumber
This means that if precautions
This means that if precautions
JET
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About this manual
This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model
JAT-480, JAT-481, and JAT-482 Pneumatic Die Grinder. 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/
JAT-480,481,482 Die Grinders
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Tool specifications
Model number JAT-480 JAT-481
Stock number 505480 505481 505482
Degree of angle 0 0 90 deg.
Collet size 1/4 in. 1/4 in. 1/4 in.
Horsepower 1.0 1.0 1.0
Free speed (@90psi) 20,000 RPM 20,000 RPM 12,000 RPM
Average air consumption
(@90psi)
Air inlet 1/4 in. NPT, swiveling 1/4 in. NPT, swiveling 1/4 in. NPT, swiveling
Air hose inside diameter 3/8 in. 3/8 in. 3/8 in.
Required air pressure 90 psi (621 kPa) 90 psi (621 kPa) 90 psi (621 kPa)
Vibration value 0.46 m/s2 0.46 m/s2 3.1 m/s2
Noise level 1 87 dB(A) 87 dB(A) 89.1 dB(A)
Grip Inline Inline Inline
Overall Length 7.9 in. (200 mm) 13 in. (330 mm) 8.3 in. (212 mm)
Housing material Composite Composite Composite
Net weight 2.2 lb. (1.01 kg) 3.2 lb. (1.43 kg) 3.2 lb. (1.46 kg)
Shipping weight 2.5 lb. (1.13 kg) 3.5 lb. (1.59 kg) 3.5 lb. (1.59 kg)
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.
5.3 CFM 5.3 CFM 5.3 CFM
JAT-482
JET
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Setup and Assembly
Any missing parts or damage should be reported
immediately to your JET® distributor. Do not use a
damaged tool. Read this instruction manual
thoroughly for operation, maintenance and safety
instructions.
Box contents:
1 Die grinder
2 Wrenches
1 Operation and parts manual
1 Product registration card
IMPORTANT: Connecting a quick-change
coupling directly to the tool is not
recommended, as vibration may cause the
connection to fail. Instead, add a leader hose
and install any quick-change couplings
farther down the line.
5. Grip tool with both hands and push safety
lever forward to release throttle lever. Gently
press throttle lever.
6. Release throttle lever to stop die grinder.
Maintenance
Operation
The die grinder must be
properly lubricated before operation. See
“Lubrication” section.
Figure 1 (JAT-480 shown)
1. Loosen collet nut using the two wrenches on
the flats of the collet nut and spindle (Figure
1). Keep wrench on spindle stationary while
turning wrench on collet nut.
2. Fully insert 1/4-inch shank of grinding
attachment (not included) into collet, and
retighten collet nut securely with wrenches.
3. Remove protective cap from air inlet (Figure
1). If an in-line oiler is not being used, add 4
or 5 drops of air tool oil (not included) in to
the air inlet.
4. Blow out air line to remove any dirt or
moisture, then connect air supply hose to
tool. Set air pressure to 90psi.
Lubrication
The die grinder should be lubricated daily (or
before each use) with air tool oil through the air
inlet. During continual operation, it should be reoiled every 1 to 2 hours. This can be done with an
in-line oiler, or manually. If done manually,
proceed as follows:
1. Disconnect air hose from tool.
2. Place 4 or 5 drops of air tool oil into air inlet.
NOTE: Air tool oil not provided; it is available
at most major hardware and tool stores. SAE
#10 oil or sewing machine oil may be used
as a substitute. Do not use detergent oil.
3. Re-connect air. Run die grinder at low
throttle without load for a few seconds to
distribute the oil throughout tool.
4. When finished operating die grinder,
disconnect air hose. Wipe off housing with a
dry cloth. Place 4 or 5 drops of air tool oil into
air inlet; re-connect air and run tool for a few
seconds to distribute the oil. Disconnect air.
Periodically apply 1 or 2 drops of air tool oil to
throttle lever and safety lever pivots, and work
lever to distribute the oil.
Storage
Avoid storing the die grinder in very humid
locations which promotes rusting of internal
mechanisms. Always oil the tool and disconnect
air hose before storage.
JAT-480,481,482 Die Grinders
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