5/16-18 X 3″ ZINC FINISH LOW CARBON FULLY THREADED STUD FULLY THREADED STUDS HAVE NO HEAD AND ARE THREADED ALONG THEIR ENTIRE LENGTH. USED IN METAL FABRICATION, CONSTRUCTION APPLICATIONS AND MACHINERY REPAIRS TO FASTEN PARTS TOGETHER THAT REQUIRE EXTENDED REACH OR LENGTHS. STUDS ARE USUALLY FASTENED WITH TWO NUTS AND USED WITH OBJECTS THAT MUST BE ASSEMBLED AND DISSEMBLED QUICKLY.