Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 173 144 found under Pin Shoulder Headle by Borgwarner Corp. The National Stock Number assigned to this part is 5315005108079, and the Federal Supply Class is 5315 Nails Machine Keys And Pins. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 173 144.