Coupling Sleeve

Coupling Sleeveis a sleeve-shaped rock drilling component with internal threads for connecting shank adapter and drill rod, or drill rod and drill rod. We produce and provide three types of drill rod couplings– semi bridge couplings, full bridge couplings, and crossover couplings, which can meet the requirements of all applications.

Product Specification

Product	Top Hammer Rock Drilling Tool - Coupling Sleeves
Other Names	Couplings, Drill Rod Couplings, Drill Coupling Sleeve,
Material	Structural Alloy Steel
Application	Tunneling , Mining , Quarrying, Blasting and Infrastructure Construction
	Facedrilling and Bolting, Bench Drilling, Production drilling, Long hole drilling, Drifting
Thread	R25, R32, R35, R38, T38, T45, T51
Coupling Type	Standard Couplings (Semi bridge Couplings)
	Full bridge Couplings
	Crossover Couplings (Adapter Couplings, Reduction Couplings, Reducer Coupling)
Diameter	33~72mm
Length	150mm~235mm
Custom Design	Thread, Diameter, Length can be customized

Standard coupling sleeve

Standard coupling sleeve, also known as semi bridge coupling sleeve, has a section of the bridge without a thread in the middle. The threaded part of the drill pipe cannot be screwed through the bridge part of the coupling, and the end of the thread can closely adhere to the casing bridge zone. Standard coupling sleeve is particularly suitable for high-torque drilling rigs. Most rope thread (R thread) and trapezoidal thread (T thread) coupling sleeves are with half-bridge type. The half-bridge type is by far the most widely used couplings.

Full bridge coupling sleeve

Full bridge coupling sleeve can completely eliminate the looseness of the coupling sleeves along with the threaded connection. It is mainly used in surface mining, with better disassembly characteristics, firmer connections, and almost no clamping situation.

Crossover couplings

Crossover couplings are used to convert different thread types or thread diameter sizes.

Coupling Sleeve Product Parameter

Thread	Length		Diameter		Weight	Model No.	Part No.
	[mm]	[in]	[mm]	[in]	[kg]
R32	160	6 1/4"	45	1 3/4"	1	LR32-D45-160
R38	180	7 1/8"	56	2 13/64"	2	LR38-D56-180
T38	190	7 1/2"	56	2 13/64"		LT38-D56-190
T45	210	8 1/8"	63	2 31/64"		LT45-D63-210
T51	235	9 1/4"	71	2 51/64"		LT51-D71-235
R38-R32	190	7 1/2"	56	2 13/64"		LR38/R32-D56-190
T38-R32	190	7 1/2"	56	2 13/64"		LT38/R32-D56-190
T38-R38	190	7 1/2"	56	2 13/64"		LT38/R38-56-190
T51-T45	225	8 7/8"	71	2 51/64"		LT51/T45-D71-225

As a rock drill bits factory, we will do our best to meet all the needs of customers.

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