Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS 1422 S54.1 ITEM 31 found under O Ring by Bauer Nilsen A S. The National Stock Number assigned to this part is 5331251502435, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HS 1422 S54.1 ITEM 31.