Accident Prevention Tags - Stock - OSHA Standard - Lockout Tags. Danger. Do Not Operate This Lock/Tag May Only Be Removed By:. 6" Height x 3 1/2" Length. RP Plastic. Header style tags meet the American National Standards Institute (ANSI Z535.5) and Occupational Safety and Health Administration (OSHA 29 CFR §1910.145(f)) requirements. Tags are to identify a temporary hazard until that hazard is eliminated or hazardous operation is complete.