Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P4138 found under Key Woodruff by Itt Bell And Gosset Hydronics. The National Stock Number assigned to this part is 5315003935676, 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 P4138.