Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4073-1 1W90 ACE SW 2 KEYS CLKW found under Switch Lock by Chicago Lock Co. The National Stock Number assigned to this part is 5930010504355, 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 4073-1 1W90 ACE SW 2 KEYS CLKW.