DIN934 Internal External Thread Adapter For Industrial / Civil Connections

Internal External Thread Adapters For Industrial And Civil Connections

Internal & External Thread Adapters are precision connectors with internal threads on one end and external threads on the other. Through differentiated adaptation of thread specifications, they achieve rigid docking of components with different sizes and types, and are widely used in pipelines, machinery, home furnishing and other scenarios requiring reducing conversion and thread compatibility. Their structural design focuses on thread matching accuracy and force transmission stability, making them core components for solving "thread incompatibility" in industrial and civil connections.

I. Core Structure and Design Highlights

• Reducing Thread Adaptation Design: One end features internal threads (for connecting bolts, screws or components with external threads), and the other end has external threads (for adapting to female parts, sleeves or interfaces with internal threads). The thread precision reaches 6H (internal)/6g (external) with complete thread profiles and no broken teeth, enabling same-diameter (e.g., internal M10 × external M10) or reducing (e.g., internal M8 × external M12) conversion, compatible with metric, imperial and other thread standards.
• Mechanical Transition Optimization: The middle part of the adapter adopts a cylindrical or hexagonal transition structure. Internal/external threads are connected to the transition section via arc chamfers (R≥0.5mm) to reduce stress concentration. The integral cold heading or machined forming ensures no splicing gaps, with shear strength ≥300MPa (for carbon steel materials), ensuring stable force transmission.
• Optional Sealing Design: Some models are equipped with annular sealing grooves at the thread root, which can be fitted with O-rings (nitrile rubber/fluororubber) or coated with sealant to achieve leak-proof connections for fluid/gas media, suitable for pressure scenarios such as water pipes and air pipes.

II. Core Parameter Specifications

III. Core Performance Advantages

• Flexible Reducing Adaptation: Internal and external thread specifications can be customized as needed (e.g., internal fine thread → external coarse thread, metric → imperial), directly solving thread mismatch issues of bolts, pipes, joints and other components without the need for additional transition parts, reducing connection costs.
• Reliable Connection Rigidity: The integrally formed structure has no weak points. With sufficient thread engagement (engagement length ≥1.2 times the thread diameter), the static tensile load of M10 carbon steel adapters is ≥10kN, which is not easy to loosen in vibrating environments.
• Convenient and Efficient Installation: No professional tools are required; connection can be completed by tightening with a wrench, compatible with conventional fastening processes. The hexagonal transition section facilitates torque application, with installation efficiency 50% higher than welding or adhesive connections.
• Strong Scene Compatibility: Optional sealing design adapts to fluid scenarios; diverse materials cover dry, humid, corrosive and other environments, balancing industrial strength and civil safety.

IV. Typical Application Scenarios

• Home Furnishing and Lighting: Reducing connection of furniture brackets (e.g., docking of table leg screws and beam sleeves), thread conversion of chandelier suspension rods (adapting to different specifications of lamp holders and hanging rods). Brass or zinc-plated carbon steel models are suitable for dry indoor environments.
• Plumbing and Water/Electric Systems: Reducing of water/air pipe diameters (e.g., DN15 internal thread to DN20 external thread), adaptation of water heater interfaces. Stainless steel models with sealing grooves can prevent water/gas leakage.
• Machinery and Equipment: Thread docking of motor and reducer shaft systems, pipeline connection of instruments. High-precision threads ensure concentricity and reduce operational vibration.
• Decoration and Display: Fixing of shelf columns and beams, connection of exhibition prop accessories. Chrome-plated models balance connection function and appearance texture.

V. Installation and Maintenance Recommendations

• Installation Points: Clean oil stains and burrs on the thread surface before installation to ensure no impurity jamming. For load-bearing scenarios, it is recommended to apply anti-loosening glue (e.g., thread locker) on the threads or use double nuts for anti-loosening.
• Maintenance Notes: Regularly check the anti-corrosion layer of carbon steel parts; if rust is found, clean it in time and touch up with anti-rust agent. For fluid scenarios, regularly check the sealing status; if leakage occurs, replace the seals or adapters.

With the core advantages of "precise adaptation + rigid connection + scene flexibility", internal & external thread adapters provide an efficient solution to solve thread compatibility issues in industrial and civil connections, balancing connection reliability, installation convenience and cost-effectiveness, and are indispensable basic connectors in machinery, home furnishing, water and electricity fields.