Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9 1 2 X 12 1 2IN X 28LBS found under Envelope Mailing by 3 Star Papers Limited. The National Stock Number assigned to this part is 7530005774849, 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 9 1 2 X 12 1 2IN X 28LBS.