Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10648 SM4-172 found under Light Indicator by Guillevin International Co. The National Stock Number assigned to this part is 6210013368529, and the Federal Supply Class is 6210 Indoor And Outdoor Electrical Lighting Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 10648 SM4-172.