HYTORC has released a washer that stops bolts from turning along with the nut.
This invention converts torque to straight axial - the bolt stretch makes the nut turning-friction and the bolt load more predictable.
To put it to the test, the Wood Group in the UK performed an accuracy study. According to Hytorc, the Group revealed that the washer was first to meet the official standard for critical flanges and a preferred bolt stretch tolerance of +/10%, while eliminating reaction arm, backup tool and elongation measurement.
Hytorc’s washer is certified and tested in accordance with ASTM A194-01 and ASME SA194-01.