Double-Headed Machine Screw
Products Description
A Double-Headed Machine Screw is a mechanical fastener with external threads at both ends, either headless or with a smooth shank in the middle. Its core characteristic is its bidirectional locking capability. One end is typically fixed internally to the substrate, while the other end connects to external structural components, thus achieving a stable and detachable connection.
Structural Features Overview:
Double-ended thread design, suitable for permanent substrate + detachable component structures.
Smooth shank or reinforced section in the middle improves overall shear and bending resistance.
Full or partial thread structure can be selected according to assembly requirements.
Compatible with various standard nut and washer systems, offering high versatility.
This structural form is often used in engineering design to replace ordinary bolts or screws to achieve higher connection stability and assembly flexibility.
Protection and Adaptability Design: Extending to Scenario-Based Needs
Corrosion-Resistant Sealing
Double Ended Carriage Bolt For humid and outdoor scenarios (such as pipeline installation and building structures), annular sealing grooves are added to both ends of the rod body, allowing for O-ring installation and preventing moisture and impurities from entering the thread gap, thus avoiding connection failure due to corrosion.
Substrate Protection Design
The thread tips are passivated (rounded corner radius 0.05-0.1mm) to prevent sharp thread tips from scratching soft substrates (such as aluminum alloys and plastic parts), while ensuring meshing strength.
High/Low Temperature Adaptability
Double-Ended Screw for high-temperature scenarios (such as industrial pipelines and high-temperature areas of machinery), a high-temperature resistant coating is used at the transition between the rod body and the thread to avoid gaps caused by thermal expansion and contraction due to temperature changes; for low-temperature scenarios, a low-temperature toughness material is selected to ensure that it does not crack in environments below -40℃.
Design Advantages: Every Dimension Serves the Mission
| Equal and Unequal Length Design | We offer standard Double-Ended Threaded Studs with equal thread lengths at both ends, as well as custom-made studs with unequal lengths to suit different working conditions. Typically, the thread length on the fixed end is shorter to ensure sufficient insertion depth, while the thread on the nut end is longer to accommodate connectors of varying thicknesses and adjustment requirements. |
| Reduced and Equal-Length Design | For applications subject to alternating loads, we recommend a reduced-length design, where the diameter of the unthreaded portion of the Double-Ended Threaded Bolt is smaller than the root diameter of the thread. This significantly improves the stud's flexibility, better absorbs shocks and vibrations, and protects the threads. |
| Precision Shaft Chamfer | We have designed a smooth fillet at the transition between the shaft and the thread. This is a critical area for stress concentration; a smooth transition can reduce stress peaks by more than 30%, a lifeline against fatigue fracture. |
Detailed Demonstration: Making the Art of Connection Visible and Evident
Finite Element Analysis Diagram of Force Transfer Path: Showcasing the stress distribution cloud map inside the Double-Ended Stud Bolt under tensile, shear, and combined loads. It highlights how stress smoothly transitions from the thread root at one end to the shank and then to the other end, verifying the effectiveness of the smooth shank section as a "stress buffer."
Cross-Sectional Model of Different Diameter Thread Conversion Application: Creating a clear cross-sectional teaching model to demonstrate how a metric thread end and an imperial thread end perfectly mesh with different Double-Ended Threaded Fasteners, and how the smooth shank section passes through a retainer sleeve, intuitively explaining its working principle as a "conversion bridge."
Coaxiality Laser Inspection Report Illustration: Displaying the radial runout inspection report of our product's thread section in polar coordinate graph form, comparing Double End Threaded Rod with common industry standards, and presenting our advantages in precision control through data visualization.
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