Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 55-25550 FIND 4 found under Screw Shoulder by Western Sky Industries Inc. The National Stock Number assigned to this part is 5305012014736, 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 55-25550 FIND 4.