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    • Home / Products / Drilling Tools / Top-hammer Drilling Tools / Coupling Sleeves and Bit Adaptors
    Coupling Sleeves and Bit Adaptors

    Coupling Sleeves and Bit Adaptors

    We provide high-quality coupling sleeves designed for secure and efficient connections between drill rods or between rods and shank adaptors. Our sleeves ensure maximum energy transfer and maintain thread integrity even under high-intensity drilling.

    Our product range includes Standard, Full-Bridge, and Crossover (Variable-Diameter) sleeves to suit any project requirement. Built from premium alloy steel, our couplings offer excellent wear resistance and durability, helping you reduce downtime and lower your cost per meter in mining and construction.

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    Product Details

    Coupling Sleeve

    The connecting sleeve is also called coupling sleeve, which is a rock drilling tool to connect the shank adaptor and drifter rods. The mainly threads are R38, T38, T45, T51. The coupling sleeve is divided into full-bridge type and semi-bridge type, diameter-unchanged type and thread-converting type. It is widely used in open-pit mining, underground mining, roadway excavation, anchor bolting, blast furnace iron-tapping, tunnel engineering, hydro-power engineering, quarrying and other construction projects.

     

    Semi-bridge Coupling Sleeve

    Semi-bridge coupling sleeve, also known as standard coupling sleeve, has a segment of bridge without any thread in the middle, so that the threaded part of the drilling rod cannot be screwed through the bridge part of the semi-bridge coupling sleeve, while the end of the thread can tightly adhere to the bridge part of the coupling sleeve. The semi-bridge coupling sleeve is particularly suitable for high-torque drilling rigs. Most rope thread (R thread) and trapezoidal thread (T thread) coupling sleeves are with semi-bridge type. By far, it is the most widely used coupling sleeve.

    Coupling Sleeves and Bit Adaptors

     

    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 open-pit mining, with better disassembly characteristics, firmer connections, and almost no stuck happens.

    Coupling Sleeves and Bit Adaptors

    Cross-over Coupling Sleeve

    Cross-over coupling sleeves are used for converting different thread types or thread sizes.

    Coupling Sleeves and Bit Adaptors

    Bit Adaptor

    Coupling Sleeves and Bit Adaptors

    Product Details

    Coupling Sleeve

    Part No.

    Thread (Not F)

    Length

    (mm)

    Diameter (D)

    mm

    Type

    HCLT38-190

    T38

    T38

    190

    φ56

    Semi-bridge

    HCLT38-190Q

    T38

    T38

    190

    φ56

    Full-bridge

    HCLR35T38-170Q

    R35

    T38

    170

    φ56

    Full-bridge

    HCLT38T45-190Q

    T38

    T45

    190

    φ63

    Full-bridge

    Product Details

    Bit Adaptors

    Part No.

    Thread

    Length

    (mm)

    Diameter (D)

    (mm)

    Female

    Male

    HCLR32T38M-220

    R32F

    T38M

    210

    φ45

    HCLST58ST68M-320

    ST58F

    ST68M

    320

    φ88

    Specifications

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