Coupling Sleeve is 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 t38, 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 threaded rod 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

[kg] Model No. Part No.

[mm] [in] [mm] [in]

R32 160 6 1/4" 45 1 3/4" 1.0 LR32-D45-160 705-0145-160

R38 180 7 1/8" 56 2 13/64" 2.0 LR38-D56-180 707-0156-180

T38 190 7 1/2" 56 2 13/64" 1.9 LT38-D56-190 722-0156-190

T45 210 8 1/8" 63 2 31/64" 2.7 LT45-D63-210 723-0163-210

T51 235 9 1/4" 71 2 51/64" 3.8 LT51-D71-235 724-0171-235

R38-R32 190 7 1/2" 56 2 13/64" 2.2 LR38/R32-D56-190 707-5156-190

T38-R32 190 7 1/2" 56 2 13/64" 2.2 LT38/R32-D56-190 722-5156-190

T38-R38 190 7 1/2" 56 2 13/64" 2.5 LT38/R38-56-190 722-0756-190

T51-T45 225 8 7/8" 71 2 51/64" 4.5 LT51/T45-D71-225 724-5371-225

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