Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4578 1032 SS 20 found under Standoff Threaded Spacing by R A F Electronic Hardware Inc. The National Stock Number assigned to this part is 5340012856008, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4578 1032 SS 20.