Sourced and supplied across Saudi Arabia
A flexible coupling tolerates misalignment; it does not correct it. That distinction is worth stating because a coupling fitted to a badly aligned machine transmits the resulting load straight into the bearings and seals at each end, and the coupling element is usually the last thing to fail rather than the first. So the alignment is still done, and the coupling is chosen for what remains after it. Torque is the second half, and it is not the driver's rating alone: a service factor is applied for the character of the load, so a compressor or a crusher needs a substantially larger coupling than a fan of the same power. Two practical points. A spacer coupling with a specified distance between shaft ends is what lets a pump seal be changed without moving the motor, and that dimension is fixed at design. And where the driven machine must be protected, an element that fails predictably is better than one that transmits everything until the shaft breaks.
The more of this you send, the closer the first quotation lands.
| Transmitted power and speed | Driver rating and RPM at the coupling |
|---|---|
| Service factor | Set by the character of the load and the starts per hour |
| Driven machine | Pump, fan, compressor, crusher, conveyor or gearbox |
| Shaft diameters | Both shafts, with keyway sizes, and any taper |
| Distance between shaft ends | Fixes the spacer length — needed for seal removal on pumps |
| Residual misalignment | Angular, parallel and axial, after alignment is done |
| Coupling type | Elastomeric jaw, tyre, grid, gear, or metallic disc |
| Torsional behaviour | State if a soft element is needed to damp torsional pulses |
| Overload protection | State if a shear or slip element is required |
| Operating temperature | Elastomeric elements have real temperature limits |
| Hazardous area | State the zone if a non-sparking construction is required |
| Standard | State if ISO 14691 or API 671 is called for by the specification |
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