Shaft Couplings

High levels of torque and axial loads can be transferred without the requirement for keyways or taper / thrust rings, and without creating stress points or fretting in operation.  

To install the OK coupling, slide the thin inner sleeve onto the shaft. This inner sleeve has a tapered outer diameter. A thick outer sleeve with matching tapered inner surface is fitted onto the inner sleeve. Ordinary mineral oil is injected between the sleeves and a built-in jack drives the outer sleeve up the taper of the inner sleeve. Once the outer sleeve reaches its final position, an interference fit is created by releasing the hydraulic pressure. Later the coupling can be easily removed by reversing the process.   

The range consists of:

• the OKC joins two cylindrical shafts  

• the OKF joins a cylindrical shaft to a shaft with a flange

• the OKCX has a special carbide friction coating, which allows a 50% greater torque capacity or a smaller, lighter unit. It joins two cylindrical shafts

• the OKFX has a special carbide friction coating, which allows a 50% greater torque capacity or a smaller, lighter unit. It joins a cylindrical shaft to a shaft with a flange

The range caters for shaft diameters from 45 mm to 1,000 mm and forces up to 23,630 kNm. Tailor-made solutions are available as a “supergrip” bolts for rotating flanges.