Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 15-23 found under Retainer Spring Adjustment by Buffalo Machine Tools Of Niagara. The National Stock Number assigned to this part is 3413011084037, and the Federal Supply Class is 3413 Drilling And Tapping Machines. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 15-23.