Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AAST2520-1.25SH found under Bolt Key Head by D And D Instruments Inc. The National Stock Number assigned to this part is 5306015939081, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AAST2520-1.25SH.