Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 123CSM11838-503 found under Fitting Assembly by G A Richards And Co Inc. The National Stock Number assigned to this part is 1560012971439, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 123CSM11838-503.