... normal. 2) Specification: 4.6, 4.8, 8.8, 9.8, 10.9, 12.9, M20*230, M24*135, M24*145, ect 3) Material ... bolt 1) Type: hex head, square head, flange head used DIN, BS, and AREA standard 2) Specification: M24*135/145/195 ... 3) Grade: 4, 5, 6,8,9,10,12 4) Raw material: Q235, 35K, 45#, 40Mn2, 20Mnsi, 35CrMo ... Grade: 4.6 4.8 5.6 6.8 10.9 12.910. Tie plate/base plate/ rail plate/ rail fixing base ...