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Marine propulsion

RotaBolt^® bolting technology provides significant improvements in safety and reliability without any requirement for specialist expertise.

Tension control is essential in achieving 100% reliability. RotaBolt fasteners not only achieve the correct tension at installation, they maintain this throughout the life of the bolted joint. Each RotaBolt tension control fastener is 100% load test calibrated and every bolt’s extension measurement is individually certified.

How does it work?
The unique RotaBolt design incorporates internal air gap technology and 100% load test calibration. The consistency of the design criteria guarantees an indicator accuracy of +/- 5% throughout the life of the bolt.

Before installation the Rotacap spins freely. As the bolt is tightened, it stretches elastically and the Rotacap locks at the bolt’s specified, load test calibrated tension value.

As soon as any tension is lost across the bolted joint, the Rotacap immediately rotates providing a clear tactile or visual indication of tension loss.

Click here for the RotaBolt section of this website or download the James Walker RotaBolt Assured Tension Control Guide.