High strength pre-tension bolt Ⅰ 〔Patent pending〕

                 

 

 
 
Technical Merits:
High pre-tension: Pretension is one of the most important factors to control the surrounding strata effectively. Facilitated with specially made torque-tension nut and “sandwich” harden washer system, this bolt can increase pretention by 30%-50% compared with other similar bolts.
High strength: Using grade 500 rebar, this bolt has higher capacity. Specially treated thread reduces the steel working hardening and the thread part has the same strength as the rebar.
Load indicator: A load indicator is designed to monitor the install load and control the quality of installation. You can choose single class and multiclass load indicator according to requirement.
 Application:
This bolt has been successfully applied in medium strength surrounding strata conditions of deep cover, high stress, without influence of dynamic stress , without yield pillar trend.
 
Specifications:
Rocbolt Technologies China Ltd