Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HMS20-1267 2388 found under Pad Sanding by Boeing Company The. The National Stock Number assigned to this part is 5350016257804, and the Federal Supply Class is 5350 Abrasive Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HMS20-1267 2388.