Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 975-135 ITEM 16 found under Washer Flat by Insinger Machine Company The. The National Stock Number assigned to this part is 5310014896249, 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 975-135 ITEM 16.