Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31900953 found under Chain Stud Link by Hammer And Steel Inc. The National Stock Number assigned to this part is 4010016170369, and the Federal Supply Class is 4010 Chain And Wire Rope. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 31900953.