Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A51F60553-11 found under Nut Plain Round by B And B Precision Components Inc. The National Stock Number assigned to this part is 5310008900752, 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 A51F60553-11.