Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 56515018 found under Drill Hardened Steel Carbide Tip by Msc Industrial Supply Co. The National Stock Number assigned to this part is 5133016191436, and the Federal Supply Class is 5133 Drill Bits Counterbores And Countersinks Hand And Machine. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 56515018.