Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9957-050-001 ITEM 13 found under Escutcheon Retainer by Acorn Engineering Company. The National Stock Number assigned to this part is 4510015027710, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9957-050-001 ITEM 13.