Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C100172-1 found under Shaft Straight by Viking Tool And Machine Corp. The National Stock Number assigned to this part is 3040000084633, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C100172-1.