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                 → Products
                High strength pre-tension yieldable bolt IⅠR 〔Patent pending〕
                High strength pre-tension yieldable bolt Ⅱ R 〔Patent pending〕
                High strength pre-tension bolt Ⅰ 〔Patent pending〕
                High strength pre-tension bolt Ⅱ 〔Patent pending〕
                Common strength pre-tension bolt Ⅰ 〔Patent pending〕
                Common strength pre-tension bolt Ⅱ 〔Patent pending〕
                INSTal Bolt
                Cable Bolts
                Cable Bolts

                High pre-tension spiral bolt

                High pre-tension snake bolt
                Post Grouting Bolt
                MechLok
                Friction-Lok Stabilizer
                All Thread Bar Bolt
                YIELD-LOK Bolt
                E-RAY Bolt
                Plate
                 → Contact
                Address:Jennmar Industry Park, Tongji Road, Gaoxin District, Jining, Shandong, China
                Tel:0537-2480366, 2480336
                Fax:0537-2480338
                Contact:Li Li
                E-mail:liliyf2@163.com
                High strength pre-tension bolt Ⅱ 〔Patent pending〕

                                 

                 

                Structure:

                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.

                Technical Merits: 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