Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3M-K20 found under Bubbles Glass by 3M Company. The National Stock Number assigned to this part is 9390015076494, and the Federal Supply Class is 9390 Miscellaneous Fabricated Nonmetallic Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3M-K20.