Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SC612 USUAL EXTRAS found under Connector Silent Chain by Rexnord Industries Inc Div Link. The National Stock Number assigned to this part is 3020003493773, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SC612 USUAL EXTRAS.