§ 29.129. Shaft projections and keyways.
(a) Set screws wherever located shall be made flush or enclosed.
(b) Revolving projections on shafting and shaft equipment such as keys and bolts and grease cups shall be enclosed by a cylindrically smooth enclosure or made flush, except for bolts or grease cups located in the hubs or rims of pulleys, collars or couplings which do not project beyond the two planes formed by the rims of the pulley, collar or coupling.
(c) Keyways in the ends of shafting less than 6 feet above the floor or working platform, which project more than 2 inches beyond the bearings, or adjacent parts of a machine, shall be plugged so as to effect a smooth shaft, or they shall be enclosed.
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