Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MCW1004-011 found under Washerspring Tension by Associated Spring Raymond Barnes. The National Stock Number assigned to this part is 5310016918159, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MCW1004-011.