Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DH4178-SS found under Standoff Threaded S by Jan Hardware Mfg Co Inc. The National Stock Number assigned to this part is 5340012183645, 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 DH4178-SS.