Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1251S057 found under Stud Shouldered by B E Aerospace Consumables Management. The National Stock Number assigned to this part is 5307013751295, and the Federal Supply Class is 5307 Studs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1251S057.