Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50 X 80 RFN 7012 found under Collar Shaft by Ringfeder Power Transmission Usa. The National Stock Number assigned to this part is 3040015023263, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 50 X 80 RFN 7012.