Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JSFB15E3-4 found under Screw Close Toleran by Pilgrim Screw Corporation. The National Stock Number assigned to this part is 5305016461392, 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 JSFB15E3-4.