Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GS21381 1 found under Indicator Dial by Hamilton Sundstrand Corporation. The National Stock Number assigned to this part is 5210015258334, 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 GS21381 1.