Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1057W3-189 found under Spacer Sleeve by Knoll Inc. The National Stock Number assigned to this part is 5365005419326, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NAS1057W3-189.