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NOTICE: This is an OSHA Archive Document, and may no longer represent OSHA Policy. It is presented here as historical content, for research and review purposes only.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

July 16, 1975

Mr. Vance D. Campbell
Chief Engineer
Standards Eimco BSP Division
ENVIROTECH Corporation
669 West Second South
Salt Lake City, Utah 84110

Dear Mr. Campbell:

This is in response to your letter of May 15, 1975, to Barry White and refers to telephone conversations with a member of my staff concerning the 5-inch separation of screws on the covers of the guards for mechanical power-transmission apparatus, and requirement in 29 CFR 1910.219(m)(2)(i)(a).

ANSI Standard B15.1-1953, Part V, Section 40, Rule 401(a) states: "Where it is necessary to change belts, make adjustments, or apply oil or grease, guards should have hinged sections or be removable." The intent of the standard is not that covers or hinged sections must be secured every 5 inches, but that the construction of the guard shall be securely fastened to the frame. The covers or hinged section may be secured by screws, bolts, wing nuts or screws, lock fasteners or compression latches to facilitate easy removal and installation.

Hopefully, this information will be of some aid in resolving your problem. If I may be of further assistance, please feel free to contact me. Thank you for your continued interest in occupational safety and health.


Janet H. Sprickman
Acting Chief
Division of Occupational
Safety Programming