Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number LP57U04J16M found under Screw Cap Socket He by Long Lok Fasteners Corporation. The National Stock Number assigned to this part is 5305009282057, 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 LP57U04J16M.