Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X2-1-128-396 found under Cap Snap Fastener by Gsg Fasteners Llc. The National Stock Number assigned to this part is 5325004980872, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like X2-1-128-396.