34 Pa. Code § 29.126 – Shafting.

(a) Endwise movement. Each continuous line of shafting shall be secured in position against excessive endwise movement.
(b) Endwise thrust. Vertical and inclined shafts shall be secured in position against endwise thrust.
(c) Over driveway. Whenever shafting extends over a driveway it shall be protected unless the shaft and any pulleys, gears or other equipment fastened to it are located 15 feet or more above the driveway.
(d) Under machines. Shafting under bench machines shall be enclosed by a stationary casing or by a trough at the sides and the top, or the sides and the bottom as the location requires. The sides of the trough shall come to within at least 6 inches of the underside of the table, or if shafting is located near the floor to within 6 inches of the floor. In each case the sides of the trough shall extend at least 2 inches above or below the shafting as the case may be.
(e) Guard. All shafting located less than six feet above the floor or working platform shall be guarded in accordance with subsection (g) except for the following:
1. (1) Shafting accessible for a distance of less than 2 feet between bearings, clutches, handwheels, pulleys, gears, sprockets or sheaves.
2. (2) Shafting within the frame of the machine when guarded by position.
(f) Shaft ends. Shaft ends less than 6 feet above the floor or working platform and 4 or more inches beyond outside parts of the machine or transmission shaft equipment shall be removed or enclosed with a stationary cover. When they are less than four inches from other equipment, such shaft ends shall be polished smooth or be enclosed with a stationary cover.
(g) Method of guarding. The guarding of shafting shall be by one of the following methods:
1. (1) An enclosure which may be by sheet metal in the shape of an inverted U open at the bottom.
2. (2) Standard railing if acceptable to the Department.