Introduction to Machine Guarding
Machine guarding is one of the most fundamental workplace safety requirements — and one of the most frequently violated. Every year, approximately 18,000 amputations, lacerations, and crushing injuries occur due to unguarded or inadequately guarded machinery. These injuries are among the most severe and life-altering workplace incidents, yet they are almost entirely preventable with proper guarding.
OSHA's machine guarding standards (29 CFR 1910 Subpart O) require employers to protect workers from hazardous machine motions and actions. Machine guarding consistently ranks in OSHA's Top 10 most-cited standards, and OSHA maintains a National Emphasis Program (NEP) on Amputations that specifically targets machine guarding violations.
This guide covers the complete requirements for machine guarding compliance, the types of guards and safeguarding devices, and practical strategies to avoid citations.
Understanding Machine Hazards
Three Categories of Machine Hazards
OSHA identifies three primary machine hazard zones that require safeguarding:
1. Point of Operation
The area where the machine performs work on the material — cutting, shaping, boring, forming, or assembling. Examples:
2. Power Transmission Apparatus
Components that transmit energy from the power source to the point of operation:
3. Other Moving Parts
Any machine part that moves and can cause injury through contact:
Types of Hazardous Motion
Understanding mo