A-RC180HIMP-AI 180 Heavy Roller Chain, 10 Ft (Import)One New Aftermarket Replacement #180H Heavy Roller Chain 10 Ft (Import) This ANSI #180H heavy duty roller chain is a 2 1 4" (2. 250") pitch single strand roller chain built to ANSI B29. 1 dimensional standards. The "H" designation indicates thicker side plates compared to standard #180 chain, increasing strength, shock load absorption, and overall wear life. This 10 ft section is well suited for heavy duty drive and conveying applications found in