Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CB40 found under Gage Headspace by Fn Herstal Sa. The National Stock Number assigned to this part is 5220010438212, and the Federal Supply Class is 5220 Inspection Gages And Precision Layout Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CB40.