Purchase Qty. Reference FOB Price
1,000-4,999 Pieces US$5.50
5,000-9,999 Pieces US$4.50
10,000+ Pieces US$4.00
Product Description
Customized Special Fastener Tunnel Bolt with Plastic Dowel This type of bolts are to be used for connecting of concrete rings for tunnel construction. They are widely used for metro and railroad tunnel construction. We manufacture and supply in carbon steel, alloy steel, with grade 4.8, 5.8, 6.8, ...