OAR 437-007-1055: Log Truck and Trailer Bunk Chains and Cables

(1) Chains or cables used to secure bunk blocks or stakes must have a manufacturer’s rating for a safe working load of not less than 6,600 pounds. The following chain and wire rope meet the 6,600 pound requirement: (a) Chain of welded link construction: (A) 3/8-inch alloy steel chain, or (B) 7/16-inch high-test steel chain, and (b) 5/8-inch IPS wire rope in 6 x 19 or 6 x 37 construction. (2) Bunk chains must be immediately removed from service when they contain cuts, cracks, other defects or when wear has reduced the original chain diameter by 15 percent. (3) Wire rope used for stake straps must meet the requirements of OAR 437-007-0605(4). (4) Only repair links with strength equivalent to the chain are permissible for repairs or attachments for chains.