Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A31170016 ITEM 11 found under Shaft Shouldered by The Hellan Strainer Co. The National Stock Number assigned to this part is 3040012626192, 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 A31170016 ITEM 11.