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Coupling sleeve is one of important component for top hammer drill string. There are 3 types of coupling components: Full Bridge, Semi-Bridge, Cross over adapter.
Prodrill T38,T45,T51 Full Bridge Coupling Sleeve:
Full-Bridge Coupling Sleeves
• 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
For more details please watch PDF online: Coupling Sleeves Catalogue