Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0 3125 18UNC 2AX4 500LG HEX HD found under Bolt Machine by American National Standards Inst. The National Stock Number assigned to this part is 5306013273526, 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 0 3125 18UNC 2AX4 500LG HEX HD.