Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 200300-3 found under Lock Assembly Left by H Koch And Sons Co. The National Stock Number assigned to this part is 1660010326778, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 200300-3.