Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X8999-J18 found under Housing Switch Conn by Cooper Crouse Hinds Llc. The National Stock Number assigned to this part is 5930012263823, 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 X8999-J18.