changshu huibo railway fastener co.,ltd
railway track material, fastener, Insulator/Dowels/Ferrule, Rail track material, base plate/rail pads, Manufacture and Supplier - China(CN)
material: 55si2Mn, 60si2Mn, spring steel bars wL20, WL24, Wl22 Rockwell hardness 42-50 Spring washer is usually supplied in natural black finish unless otherwise specified. At the request of customer we offer:phosphate coated, electro-galvanized, ... - Update: 2009-06-08