HSS Rotary Files and Burrs (M2 High-Speed Steel)
Midget Mills® ground from M2 high-speed steel, Rockwell 63-65. Made in USA since 1931
Request a Quote Find a Distributor Rotary Burrs Catalog (PDF) All Carbide BurrsWhen to Choose an HSS Rotary File Over Carbide
High-speed steel burrs are the tougher, more forgiving choice for hand-held die grinders, interrupted cuts, and softer or non-work-hardening materials. This page lists every HSS Midget Mill® shape with its EDP number.
HSS Midget Mills® use a right hand spiral tooth pattern with a light chipbreaker, originated by Severance Tool. Ground from M2 high-speed steel hardened to Rockwell C 63-65, they absorb shock and side loads that would chip a carbide burr, so they suit hand-held work, flexible-shaft grinders, and deburring where the tool contacts an edge. Typical materials: cold and hot rolled steels, tool steels such as M2 and M42 in the annealed state, aluminum, brass, bronze, and cast iron. For hardened steel, stainless, titanium, and high-volume production, see our carbide burrs.
Each Midget Mill is individually ground rather than milled or stamped, which is why the flutes stay sharp longer and why the tools can be resharpened several times. Run HSS burrs at about half the RPM of carbide of the same diameter; the speed and feed page has the Severance RPM chart, and the HSS vs carbide guide covers cost per part.
"We are the originators; we have been copied but not surpassed."
Ordering Tip
All tools are ordered by their EDP Number (Electronic Data Processing). Find your tool in the tables below and use the EDP number when placing orders.
Key Features
- Precision ground flutes
- Available in 25 standard shapes (A-N, P-X, Bi-Convex and Flame)
- M2 High-Speed Steel
- 1/4" standard shank
- Resharpenable
- Made in USA
