Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PT 1.6 TEST CARDS found under Card Test Pt 1 6 by Bayer Corp. The National Stock Number assigned to this part is 6550014921503, 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 PT 1.6 TEST CARDS.