Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3 4-10UNC-2A X 12 IN. LG STL found under Stud Plain by American National Standards Inst. The National Stock Number assigned to this part is 5307013442091, 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 3 4-10UNC-2A X 12 IN. LG STL.