Proto Tool J138WP 3/8" Air Impact Wrench 525 ft/lbs - Tether Ready

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Item Number:PROJ138WP
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Proto Tool J138WP 3/8" Air Impact Wrench 525 ft/lbs - Tether Ready

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  • Titanium housing helps to reduce weight, improve balance and ensure maximum durability.
  • Ergonomically designed handle-forward design improves balance and control, helping to reduce operator fatigue.
  • Robust twin hammer mechanism for efficient energy transfer and long service life.
  • Ambidextrous forward/reverse lever can be actuated with a single hand, even with gloves on.
  • Three position power regulator for forward rotation. Reverse rotation operates at maximum for highest breakaway torque.
  • Feather throttle for maximum operator control.
  • Side-fed, 6-vane air motor for maximum power and efficiency.
  • Machined motor housing reduces number of parts, creating precision alignment, reducing wear, increasing efficiency and simplifying maintenance.
If you are looking for larger quantities than shown, please contact us through this items messaging. We can ship (direct to you from the manufacturer) additional quantities of this item or different items from this same Brand.

The J138WP includes:

  • 1x Proto J138WP 3/8" Drive Air Impact Wrench


  • 360° Rotating Air Inlet Fitting.
  • Titanium Exhaust Deflector and Muffler.
  • Integrated Tethering Capability in all Proto Air Tools.
  • Optional ProtoIDAir Fitting for RFID Tracking Capability.

Tech Specs:

  • Drive Size [in]: 3/8
  • Breakaway Torque (Ft Lbs): 525
  • Blow Rate Forward (BPM): 1750
  • Average Air Consumption [cfm]: 4.4
  • Free Speed [RPMs]: 10500
  • Overall Length [in]: 6

UPC - 662679107208

Overall Rating for Proto Tool J138WP 3/8" Air Impact Wrench 525 ft/lbs - Tether Ready
(based on 1 review)
Unbelievable power
By John from Boca Raton Florida on March 2, 2014
This is the most powerful 3/8 drive impact I have ever seen or used. Definitely need to use impact sockets with this thunder gun. Very balanced and easy direction change.
Awesome power
Compact size
Hard to feather the trigger, it's either wide open or stopped.

I would recommend this item to a friend.

Proto Tool J138PB 3/8" Impact Protective Boot
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Proto Tool J138PB 3/8" Impact Protective Boot

  • Designed for use with Proto 3/8" Impacts
  • Fits your tool like a glove and protects it from the elements
  • Moisture resistant
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