Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BS4168 PART 1 found under Screw Cap Socket He by British Standards Institution. The National Stock Number assigned to this part is 5305996245070, 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 BS4168 PART 1.