Studs - Ball Description AMK Finish OEM Part # Origin AMK Part # CLICK FOR PRICING 1/4-20 X .22 D X 1.02 BALL STUD CASE HARD. 1 pk .0002 Zinc & Wax (OKW) 3949065 B-10991 1/4-20 X .25 BALL X .98 OAL STUD CASE HARD. 1 pk .0002 Zinc & Wax (MNL) 3924414 B-10992 1/4-28 X .375 BALL X 1.21 OAL STUD PLAIN. 1 pk Plain Finish (PFR) B-14086 5/16-18 X .25 BALL X 1.0 OAL STUD CASE HARD. 1 pk .0002 Zinc & Wax (OCF) 3991261 B-10993 3/8-16 X .88 BALL X 1.82 OAL STUD CASE HARD. 1 pk Plain Finish (MUB) 3935289 B-10994 1/2-13 X .88 BALL X 2.42 L STUD PLAIN w RBR. 1 pk Plain with Rubber (MUG) 3866568, 3793522 (sim) B-10995