Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B23-31902 found under Spacer Ring by Brunswick Corporation. The National Stock Number assigned to this part is 5365004980785, 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 B23-31902.