Skip to Main Content

This information is provided free of charge by the Department of Industrial Relations from its web site at These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at
Subchapter 7. General Industry Safety Orders
Group 6. Power Transmission Equipment, Prime Movers, Machines and Machine Parts
Article 41. Prime Movers and Machinery
Return to index
New query

§3995. Flywheels.

(a) Any exposed hazardous part of a flywheel 7 feet or less above the floor or working level shall be guarded.

NOTE: The spokes of machine flywheels may be covered with a circular disk guard.

(1) When a flywheel extends into a pit or is within 12 inches of the floor and a guardrail is used, a toeboard shall also be provided. See Figure G-4.

(b) When it is necessary to move flywheels for starting, guards may be removed temporarily but shall be replaced immediately after such operation is complete. A slot opening for jack bar will be permitted.

Every jack bar should be equipped with a hand stop so located that it will safely clear the flywheel guard when fully inserted but will prevent the worker's hand being pinched between the slot and bar.

(c) Wherever flywheels are above working areas, guards shall be installed having sufficient strength to hold the weight of the flywheel in the event of a shaft or wheel mounting failure.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Repealer and new section filed 10-25-74; effective thirtieth day thereafter (Register 74, No. 43).

2. Editorial correction of Article heading (Register 80, No. 51).

3. Amendment filed 10-9-85; effective thirtieth day thereafter (Register 85, No. 44).

Go BackGo Back to Article 41 Table of Contents