Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5S1-2 found under Stud Turnlock Fastener by Alcoa Global Fasteners Inc. The National Stock Number assigned to this part is 5325010931614, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5S1-2.