Archive Notice - OSHA Archive

NOTICE: This is an OSHA Archive Document, and may no longer represent OSHA Policy. It is presented here as historical content, for research and review purposes only.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at

29 CFR 1910.217(b)(1) and 29 CFR 1910.219(b)(1)(i)

Dec. 18, 1975



Regional Administrator - OSHA
SUBJECT: 29 CFR 1910.217(b)(1) Press Flywheel Guards


This memorandum is in response to your correspondence dated October 6, 1975, requesting clarification of the required strength of flywheel guards.

The requirements of 29 CFR 1910.217(b)(1) applies to flywheels on all presses regardless of their distance in height from the floor, with construction such as described in 29 CFR 1910.219(b)(1)(i). In addition, the design of the brackets is intended to be of such strength to contain the wheel if the shaft should break or the wheel come off. A widely used basis for design of these brackets is the ability to support twice the static weight of parts to be contained. There is no provision for the guard to retain fragments in the event of disintegration.

Barry J. White
Associate Assistant Secretary
for Regional Programs