Tunnel Construction Bolt

Tunnel Construction Bolt

We produce and supply three types of tunnel construction bolts.  Detailed specifications are as follows.
1.  Spear bolts with special pitches. The dia. is20mm and the threaddiameter is 24mm.
2.  Hex flange boltwith round threads for metro and tunnels. The shank dia. is 22mm and the diameter ofthread is 24mm.  The length ranges from 230mm to 440mm.  It is plated by yellow zinc.
3.  Squareflange bolts with round threads for tunnels.  The shank dia. is 22mmand the thread diameter is 25mm.  The length ranges from 400 mm to 560mm.  It is hot dip galvanized.

Zhongbo Railway Fastening Company is a professional tunnel construction boltmanufacturer and supplier located in China.  In addition to the tunnel construction bolt,we provide elastic rail clips, rail insulators, rail joint bars, etc.  Due to reliable quality and reasonable prices,our rail fastenings are well received in many countries including NorthAmerica, Europe, and Southeast Asia.  If you are in need of our railway fasteners,please contact us via the phone number or email provided on our website.  We look forward to hearing from you.