A new Super Stiff Bolt was made and tested by our company recently. It was a complete new design friction bolt which was tend to replace the traditional one in the future underground support system. The new design was much stiffer than the traditional one and easy to operate on site, inner sleeve was no longer to be used inside the bolt making the production more efficient and lower cost. We are expecting that the new Super Stiff Bolt could be accepted and popular in the market.
