... nut, square nut, heavy and normal. 2) Specification: 4.6, 4.8, 8.8, 9.8, 10.9, 12.9 ... /more coin spring washer 3) Raw material: 60Si2Mn, 65Mn, 70#. 4) Surface: black, zinc, plated, hdg6. E clip /Rail ... 5/83/47/815/161''4''-12' used AREMA, BS square spike, Twisted spike, 70 type spike and other spikes ... . 2) Raw material: Q235, 35#, 45#, 40Mn2, 20Mnsi 3) Grade: 4.6, ...