Mich. Admin. Code R. 408.7100

Current through Vol. 24-24, January 15, 2025

Section R. 408.7100 - Hoisting chains

Rule 100.

(1) Only roller chain made of high quality alloy, heat treated steel with the following characteristics is acceptable for hoisting chains:

(a) Prestressed.

(b) Shot peened.

(c) In-line blanking.

(d) Deep case hardening of pins and bushings.

(2) Suspension means shall not be less than 2 separate roller chains, each chain having a tensile strength of not less than 3,500 pounds.

(3) The factor of safety of the suspension means shall be not less than 7.

(4) A chain shall have not less than 6 inches of chain available beyond the normal stopping point when the car has reached its extreme limits of travel.

(5) A chain end shall be fastened by standard master links.

Mich. Admin. Code R. 408.7100