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https://www.litechtools.com/products/coupling-sleeve.html

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
ProductTop Hammer Rock Drilling Tool - Coupling Sleeves
Other NamesCouplings, Drill Rod Couplings, Drill Coupling Sleeve,
MaterialStructural Alloy Steel
ApplicationTunneling , Mining , Quarrying, Blasting and Infrastructure Construction
Facedrilling and Bolting, Bench Drilling, Production drilling, Long hole drilling, Drifting
ThreadR25, R32, R35, R38, T38, T45, T51
Coupling TypeStandard Couplings (Semi bridge Couplings)
Full bridge Couplings
Crossover Couplings (Adapter Couplings, Reduction Couplings, Reducer Coupling)
Diameter33~72mm
Length150mm~235mm
Custom DesignThread, 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
ThreadLengthDiameterWeightModel No.Part No.
[mm][in][mm][in][kg]
R321606 1/4"451 3/4"1LR32-D45-160705-0145-160
R381807 1/8"562 13/64"2LR38-D56-180707-0156-180
T381907 1/2"562 13/64"1.9LT38-D56-190722-0156-190
T452108 1/8"632 31/64"2.7LT45-D63-210723-0163-210
T512359 1/4"712 51/64"3.8LT51-D71-235724-0171-235
R38-R321907 1/2"562 13/64"2.2LR38/R32-D56-190707-5156-190
T38-R321907 1/2"562 13/64"2.2LT38/R32-D56-190722-5156-190
T38-R381907 1/2"562 13/64"2.5LT38/R38-56-190722-0756-190
T51-T452258 7/8"712 51/64"4.5LT51/T45-D71-225724-5371-225

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