Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 476-01138 ITEM 57 found under Washer Lock by York International Corporation. The National Stock Number assigned to this part is 5310014237052, 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 476-01138 ITEM 57.