Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 810501-173 ITEM NO. 20 found under Switch Sensitive by Tri Tec Manufacturing Llc. The National Stock Number assigned to this part is 5930016140687, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 810501-173 ITEM NO. 20.