This #120H Heavy roller chain fully meets all ANSI standards and is a durable, economically priced roller chain that has a tensile strength of 36,300lbs. The Economy Plus series roller chains feature heat-treated side plates to ensure the strength and durability of the roller chain. The "H" designates that his chain has thicker side plates and is part of the heavy series of roller chains. Having the thicker side plate increases strength, shock load, fatigue, and the overall working life of the chain. Economy Plus #120H roller chain is commonly supplied as 10ft boxes, but alternate lengths are available per request.