SPEAR BOTS & SOCKETS
Spear bolts and the accompanying cast-in sockets fulfill the same function as curved bolts
(permanently fix tunnel segments)whilst being easier to install.
A major advantage of the spear bolt is that following installation only one pocket per bolt requires finishing.
They are used to enable efficient erection of tunnel segments
COMPLETE RANGE AMAILABLE
HuiBo Railway manufacture a complete range of spear bolts and sockets from M16 to M30 diameter
Lengths can be made to suit customers requirement
We encourage enquiries and drawings for Custmization of bolts and fittings.
STRENGTH GRADES
Both mild steel 4.6 and high tensile 8.8 grades are availabla
Other grades available upon application
FINISHES
Spear boltscan be supplied in galvanised and sherardised as standard finishes
0ther finishes available to suit customer requirements
Pull out data for plastic sockets isavailable upon request

CURVEDTUNNEL BOLTS
Curved bolts are used to permanently Fix tunnel segments together through a radius hole, They can
be used in both radial and circumferential joints.
COMPLETE RANGE AVAILABLE
HuiBo Railway manufacture a complete range of curved tunnel bolts from M16 to M30 diameters.
Lengths and radius can be made to suit customers requirements.
We encourage enquiries and drawings for Customization of bolts and fittings.
STRENGTH GRADE
Both mild steel 4.6 and high tensile 8.8 grades are available .
Other grades available upon application.
FINISHES
Curved tunnel bolts can be supplied in galvanised and sherardised as standard finishes .
Other finishes available to suit customer requirement.

ANCHOR BOLT
Our Anchors are Complete systems including anchor,nuts,helical spring washers
sockets,ferrules and resin.Designed to meet exacting performance,all our anchor
systems are tested to internationally recognized standards.
It has two systems : Fixed Anchor System and Removable Anchor System separately .
The dia available in M22,M24,M27 with lengths to suit any applications.