Curved tunnel bolt

• Dimension: 3/4-10 UNC2A
• Length ranges 300mm to 500mm
• Grade: 4.8
• Surface: HDG or according to clients' requirement
• Packing: Plastic bags and wooden pallets

Spear bolts with plastic socket

Our spear tunnel bolt with plastic socket is manufactured according to customer's individual requirements. You can specify the length, diameter, steel grade, and choose from a range of surface finishes (e.g. galvanized, bright zinc plating, etc.). They can be supplied in grade 4.6 and 8.8.

Plastic socket sizes are available in:
M20 x 100, M20 x 120, M20 x 130, M20 x 135, M24 x 100, M24 x 110, , M24 x 120, M24 x 135, M24 x 140, M24 x 150, and M24 x 160.

The large thread design on the socket allows the tunnel bolt to be inserted 4 to 5 times faster than traditional metric thread. The design of the threads utilizes the strength of the concrete (as the load is transmitted through the concrete) therefore not relying on the strength of the plastic. This tunnel bolt is available in any length, grade, and finish to suit customer requirements.