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The New Superbolt HyFit system has been conceived to eliminate the need for an internally connected thread puller. It uses a threaded connection of larger diameter than the bolt, making it far safer to use than any existing hydraulic coupling bolt design. Traditional, ‘fitted’ bolts reduce in diameter when tightened, leaving clearance and the possibility of coupling slippage under shock loading. This can lead to difficulty in removal, resulting in coupling hole and bolt damage and causing outage delays and expensive repair work.