Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number V400-012 NO. 18 found under Screw Cap Hexagon H by Velan Valve Corporation. The National Stock Number assigned to this part is 5305014173856, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like V400-012 NO. 18.