Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 51C2MB found under Knob by Jan Hardware Mfg Co Inc. The National Stock Number assigned to this part is 5355010751017, and the Federal Supply Class is 5355 Knobs And Pointers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 51C2MB.