Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 437306ITEM27 found under Screw Cap Socket He by Western Filter A Division Of. The National Stock Number assigned to this part is 5305016314808, 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 437306ITEM27.