Hydraulic tensioners nut develops a load directly proportional to the oil pressure, this can be accurately controlled and because it is developed hydraulically it is evenly applied. Multiple nuts can be connected with hoses for simultaneous operation allowing all bolts in a joint to be evenly loaded to the same high and accurate pre-load.
When oil pressure is applied, the joint is compressed and the bolt stretches, this produces a gap between the body of the nut and the piston. Depending on the type of nut, either shims are inserted into the gap or a locking collar on the piston is turned. When the hydraulic pressure is released, the load is transferred onto the shims or the locking collar to retain the load
The hydraulic nut is self-aligning while under pressure and misalignment or flange rotation will produce a variation in the gap between the nut body and the piston. In the case of shim type nuts, tapered shims can be made and fitted to eliminate the effects of misalignment and flange rotation. In the case of collar type nuts, a spherical washer would need to be fitted under the hydraulic nut.
| Model Code | Size | O D | HT | Stroke | Port | Piston Area SqCm | Oil Capacity in CC | Pressure in Bar | Capacity in Kg | Wt. in Kg |
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