Top Hammer Coupling Sleeves for Drilling Rods

Rock Drilling Tools

Top Hammer Coupling Sleeves

Thread types: R thread, T thread
Material: Medium-carbon alloy steel

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Typical Applications

Underground mining, construction and foundation works, road and infrastructure construction

Underground mining operations

Piling and foundation drilling

Technical Specifications

Model	Thread A	Thread B	Outer diameter		Length		Weight, kg
Model	Thread A	Thread B	mm	inch	mm	inch	Weight, kg
R32-R25 COUPLING SLEEVE	R32	R25	45	1 3/4''	170	6 57/64''	1
R32-R28 COUPLING SLEEVE	R32	R28	45	1 3/4''	170	6 57/64''	0.95
R38-R65 COUPLING SLEEVE	R38	R65	55	2 5/32''	180	7 1/8''	1.85
T38-R32 COUPLING SLEEVE	T38	R32	55	2 5/32''	180	7 1/8''	2
T38-R38 COUPLING SLEEVE	T38	R38	55	2 5/32''	190	7 33/64''	1.85
R38-R38 COUPLING SLEEVE	R38	R38	55	2 5/32''	170	6 57/64''	1.7
T38-T38 COUPLING SLEEVE	T38	T38	55	2 5/32''	190	7 33/64''	1.95
T45-T45 COUPLING SLEEVE	T45	T45	63	2 15/32''	210	8 17/67''	3.1
T45-T45 COUPLING SLEEVE	T45	T45	66	2 19/32''	210	8 17/67''	3.5
T51-T51 COUPLING SLEEVE	T51	T51	72	2 7/8''	235	9 1/4''	5.2
T51-T51 COUPLING SLEEVE	T51	T51	76	3''	235	9 1/4''	5.7

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How do I order the correct coupling sleeve?

When ordering a coupling sleeve, the following information should be provided: Thread type at both ends of the coupling sleeve, outer diameter of the coupling sleeve. These parameters must match the thread specifications and outer diameters of the drilling components to be connected.

What is the function of a coupling sleeve?

Coupling sleeves serve the following functions in top hammer drilling systems:

Connecting drill rods: The threads at both ends of the coupling sleeve correspond to the threads of the drill rods being connected, and the sleeve outer diameter matches the drill rod diameter to ensure proper alignment and torque transmission.
Connecting different drilling components: Coupling sleeves are also used to connect drill rods to shank adapters or drill bits, allowing components with different thread types to be effectively combined into a single drilling system.