Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1534 found under Tap Thread Cutting by Union Butterfield Corp. The National Stock Number assigned to this part is 5136010601691, and the Federal Supply Class is 5136 Taps Dies And Collets Hand And Machine. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1534.