Tunnel spear bolts are used to secure concrete tunnel segments.
As a professional tunnel bolt manufacturer, Kingrail Parts can provide tunnel spear bolts in diameters and lengths from M16 –M30. We can also customize tunnel spear bolts as per customers' specifications and requirements.
Specification:
Material: carbon steel or stainless steel----Q235, 35#, 45#, 35CrMo, 42CrMo, 40Cr, etc.
Specifications: Complete range of diameters from M16 to M30, no length restrictions.
Rating: 4.6 and high strength 8.8
Surface treatment: plain (oiled), galvanized, hot dipped galvanized, white zinc plated, yellow zinc plated, black, dacromet, geomet or other specified by customer
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