Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 421 1 1 2 IN found under Tape Pressure Sensitive Adhesive by Minnesota Mining And Mfg Co. The National Stock Number assigned to this part is 7510013581495, 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 421 1 1 2 IN.