Shanghai Suyu Railway Material Co.,Ltd

Contact person: Linda Yuan

Tel: 0086-021-58999010

Mp: 008615901613885


skype: wysuyu1

Add: 1736 Room 15th Building 201 Jinxiang Road Pudong Shanghai China 201206

Tunnel bolt

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Tunnel bolts are structural high-strength bolts that vary in size and grade  depending on the application and bearing capacity.

Diameter 25mm -30mm
Length 250mm-500mm
Level 8.8/10.9/12.9,
Surface: Galvanized and hot-dip galvanized

tunnel bolt          Tunnel bolt usage

tunnel bolt with square flange

1、Square flange bolts with round thread for tunnel construction

Diameter: 25mm
Length from 400mm to 500mm 
Tension strength is more than 700MPA
Surface: Yellow Zinc or according to clients' requirement 
Packing: 600pcs in wooden case

cruved tunnel bolt

2、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 bolt

3、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.

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