Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12Y6558 found under Clamp by Pacific Car And Foundry Co. The National Stock Number assigned to this part is 4030003506490, and the Federal Supply Class is 4030 Fittings For Rope Cable And Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 12Y6558.