Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11504-1 found under Collet Body by Bfm Energy Products Corp. The National Stock Number assigned to this part is 3432000820882, and the Federal Supply Class is 3432 Electric Resistance Welding Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 11504-1.