Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 16X87 SZ 18 found under Needle Sewing Machi by Singer Co The. The National Stock Number assigned to this part is 3530011324636, 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 16X87 SZ 18.