Screw spike/Sleeper screw/ Coach screw/ Drive screw/ Timber screw
Type : Ss5. Ss8. Ss25 . Ss36 ......
Raw material : Q235. 35#. 45# . 40Mn2. 20Mnsi
Grade : 4.6, 5.6, 8.8
Surface: plain (oil ). black . zinc .hdg etc