Screw Spike Screw spike/Sleeper screw/ Coach screw/ Drive screw/ Timber screw Standard: ASTM, BS, GB and or according to customers' specifications. Model: Ss5. Ss8. Ss25. Ss36... Raw material: Q235, 35#, 45#, 40Mn2, 20Mnsi Dia.: From M16 to M60 Grade: 4.6/5.6/8.8 Finish: Plain, zinc plated, hot DIP galvanized, Dacromet, etc. Always assembly with double spring washer Fe6 or flat washer Uls7 and screw inserts. Contact DetailSkype:aliceyang009QQ:975082058Mobile:+86-15050462428 Email: aliceyang1314@hotmail.com