Hand-Held Motor-Operated Electric Tools - Safety - Part 2-23: Particular Requirements for Die Grinders and Small Rotary Tools
UL 60745-2-23
1 Scope This clause of Part 1 is applicable, except as follows: Addition:This standard applies to die grinders and small rotary tools for mounted accessories not exceeding 55 mm in diameter and mounted sanding accessories not exceeding 80 mm in diameter such as

• threaded CONES OR PLUGS that are threaded on a mandrel with an unrelieved shoulder flange,
• mandrel MOUNTED WHEELS, and
• rotary files

with a RATED SPEED not exceeding a peripheral speed of the accessory of 80 m/s at RATED CAPACITY.This standard does not apply to straight and vertical grinders utilizing flanges for driving an abrasive accessory. Those tools are covered by IEC 60745-2-3.