Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FB22-012-004 found under Blade Thickness Gage by A And E Mfg Co. The National Stock Number assigned to this part is 5210002239203, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FB22-012-004.