Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS52H0635Z0860 found under Washer Flat by Sikorsky Aircraft Corporation. The National Stock Number assigned to this part is 5310012751486, 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 SS52H0635Z0860.