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Shijiazhuang Weilida Prospecting Machinery Co., Ltd.
Shijiazhuang Weilida Prospecting Machinery Co., Ltd.

The cross over sub is a transitional tool used in rocking drilling,water well drilling, oil drilling and anchor drilling, to connect different specifications of drilling tools, mainly used to solve the problem of mismatched size of drill string components. Its core functions include transmitting torque, bearing axial loads, and maintaining smooth mud channels. Common types include API standard conversion joints and special threaded joints.

Types of Cross Over Sub

  • Tool Joint
    High-performance 35CrMo/42CrMo alloy steel lock joints & drill pipe connections with precision CNC machining, heat treatment, and anti-galling thread finishes. Ensures durability, easy disassembly and interchangeability for demanding drilling operations.
    Tool Joint
    Tool Joint
  • Adapter Sub
    Premium 35CrMo/42CrMo alloy steel lock joints & drill pipe connections—heat-treated, nitrided, & CNC-machined for galling resistance & crack prevention. Engineered with interchangeable, tight-tolerance threads for seamless disassembly & long-lasting performance in extreme drilling conditions.
    Adapter Sub
    Adapter Sub

Welida Cross Over Sub Uses

Welida Cross Over Sub Uses

Connect drill string components with different specifications: solve the matching problem between drill string components with different sizes or threads, and achieve drill string connection.


Welida Cross Over Sub Uses

Temporary expansion of drill string function/emergency replacement: Quickly install measuring tools or replace damaged joints to ensure drilling continuity.

Advantages of Cross over sub

Connect Drilling Tools of Different Specifications
Enhance Combination Flexibility
Economic Savings
Extend Tool Life/Facilitate Maintenance
​Adapt to New/Special Tools
Advantages of Cross over sub
Connect Drilling Tools of Different Specifications

Solve the problem of mismatched sizes or threads of drill rods, drill collars, etc.


Advantages of Cross over sub
Enhance Combination Flexibility

Facilitate optimization of drill string structure during geological changes.


Advantages of Cross over sub
Economic Savings

Avoid purchasing a complete set of new drilling tools due to different specifications.


Advantages of Cross over sub
Extend Tool Life/Facilitate Maintenance

Protect the main drilling tool threads, and only replace the joints when damaged.


Advantages of Cross over sub
​Adapt to New/Special Tools

Connect new technology tools to existing drill string systems.

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