Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 251938-505 found under Screw Cap Socket He by The Oilgear Company. The National Stock Number assigned to this part is 5305015436150, 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 251938-505.