... nut, heavy and normal. 2) Specification: 4.6, 4.8, 8.8, 9.8, 10.9, 12.9, M20*230, M24*135, M24 ... : M24*135/145/195 3) Grade: 4, 5, 6,8,9,10,12 4) Raw material: Q235, 35K, 45#, 40Mn2 ... (oil); black paint; color paint; zinc; hdg; etc8. Screw spike/sleeper screw/ dog spikes 1) Type: Ss series square spikes remain ... 45#, 40Mn2, 20Mnsi 3) Grade: 4.6, 5.6, 8.89. Dog spike/railroad spike 1) Type: All kinds are ...