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Pneumatic 1/4 in. Professional Mini Die Grinder

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Lightweight and compact air die grinder is easy to use in tight spots and sturdy enough for production work

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INGERSOLL RAND 307B at $72.45 Save 51%

Available Online by Nov. 25

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Product Overview

The CHIEF™ Professional Air Mini Die Grinder is compact and easy to maneuver in tight areas. The adjustable speed regulator makes it easy to work with a wide variety of materials. The paddle-style trigger is designed for easy, precise control.

  • Compact and durable design ideal for maneuverability and hard to reach areas
  • Lightweight aluminum body for less fatigue and effortless handling
  • Paddle-style trigger for smooth operation and control
  • Front exhaust directs debris away from work area
  • Adjustable speed regulator for a variety of job applications

Important Information

  • Harbor Freight’s CHIEF products are not endorsed by or affiliated with Chief Automotive Technologies, Vehicle Services Group, LLC, or their affiliates.

Customer Videos

We think you’ll enjoy these customer-made YouTube videos about our products. They’re independent, uncut and unsponsored. They may also contain some four-letter words that aren’t “tool” and other content that’s not appropriate for children. We hope these videos help inform your tool-buying decisions. And a note from the lawyers: Products should always be used in accordance with the owner’s manual.


Air inlet size
1/4 in. - 18 NPT
Average air consumption
2.9 CFM @ 90 PSI
Collet size (in.)
1/4 in.
Exhaust location
Speed (max)
25,000 RPM
Product Length
4-7/8 in.
Product Weight
0.6 lb.
Product Width
2-1/4 in.
Recommended hose size (in.)
3/8 in.
Shipping Weight
1.15 lb.
Working pressure (psi)
90 PSI
CA Residents
Warning - Prop 65 Info
Note: Specifications are approximate and subject to change


We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.