Screw spike/ sleeper screw: ss5, ss8, ss25, ss36 ⦠3/ 4â * 4-7/ 8â , 7/ 8â * 5-3/ 4â , 15/ 16â * 6â , M22* 170, M24* 161 Material: Q235, 35& 45 steel or specified Grade: 4.6, 4.8, 8.8 Surface: plain, zinc, black, hdg Used to tighten the rail track onto the wooden or concrete tie