PRODUCTS › Drilling Tools › Rock Drill and Blast › Couplings
 

Boart Longyear 

Couplings

Boart LongyearTM manufactures semi-bridge, full bridge and adapter couplings for the percussive market.


Semi-Bridge Coupling

Full-Bridge CouplingAdapter Coupling 
    

Semi-Bridge Coupling


Semi-Bridge Coupling

- Small non-threaded bridge in the center
- Smaller diameter steel end portions fit together in the center bridge area of the coupling
- Steel cannot thread past bridge area
- Semi-bridged couplings are most suited to high torque machines
- Most Rope and HM Threaded couplings are semi-bridged

    
Full-Bridge Coupling


Full-Bridge Coupling

- Eliminates the potential for the coupling to creep along the threaded joints
- Typically used in surface applications
- Better uncoupling characteristics and tend to maintain tighter joints
- Less chance of jamming
- Best suited to machines equipped with independent rotation (i.e., S36IR rock drill)

    
 Adapter CouplingAdapter Coupling

- Used when changing from one thread type, or size, to another and are typically required only in special
  circumstances