Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NCS 4S 2 12 found under Stud Self Locking by Dar Electronics Inc. The National Stock Number assigned to this part is 5307008767863, and the Federal Supply Class is 5307 Studs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NCS 4S 2 12.