... heavy and normal. 2) Specification: 4.6, 4.8, 8.8, 9.8, 10.9, 12.9, M20*230, M24* ... bolt / clamp bolt / track bolt 1) Type: hex head, square head, flange head used DIN, BS, and AREA standard 2) Specification ... black paint; color paint; zinc; hdg; etc8. Screw spike/sleeper screw/ dog spikes 1) Type: Ss series square spikes ... 40Mn2, 20Mnsi 3) Grade: 4.6, 5.6, 8.89. Dog spike/railroad spike 1) Type: All kinds ...