Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JSFB15E4 8 found under Bolt Internal Wrenching by B And B Specialties Inc. The National Stock Number assigned to this part is 5306016659986, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like JSFB15E4 8.