Double-Ended Screw
Products Description
A Double-Ended Screw is a fastener with external threads at both ends.
Typically, one end is fixed to the main body of the equipment, while the other end is used to install accessory parts or connect structural components.
Depending on the application environment, it can be designed as:
Full-thread double-ended studs
Equal-length double-ended studs
Unequal-length double-ended studs
Combined coarse and fine thread double-ended studs
Positioning double-ended studs
High-strength double-ended studs
Stainless steel double-ended studs
Custom-made irregular-shaped double-ended studs
The products can meet a variety of connection needs, from light-duty electronic equipment to heavy-duty industrial structures.
In-depth Analysis of Manufacturing Process
Raw Material Selection and Pre-treatment: Certified rod stock is selected, undergoing rust removal and straightening to ensure a defect-free surface.
Precision Forming: A multi-station cold heading machine is used to form the thread blanks at both ends in one pass, reducing material waste and improving the continuity of metal fibers.
High-Precision Thread Rolling: Imported thread rolling plates or wheels are used to roll the threads at room temperature, preserving metal flow lines and increasing fatigue life by more than 30%.
Heat Treatment Strengthening: Tempering or carburizing treatment is used to precisely control the hardness range (HRC 25-40 optional), balancing strength and toughness.
Surface Protection: Environmentally friendly electroplating or coating processes form a uniform and dense protective layer, with salt spray test tolerance far exceeding the industry average.
Final Inspection and Packaging: 100% visual inspection and thread gauge checks are performed, combined with rust-preventive oil and professional packaging to ensure the Double-Ended Threaded Bar arrives at the customer's site in perfect condition.
Main Functions: Anchoring, Compensation, and Transfer
Deep Anchoring Function
In scenarios requiring extremely high pull-out strength (such as mold and injection molding machine connections, and building embedded parts), one end provides a strong anchoring force by deeply screwing into the base material. In contrast, the other end is used to install the lock nut, ensuring absolute stability of the connection.
Thermal Compensation Function
In pipeline installations or high-temperature molds, there is significant thermal expansion and contraction during equipment operation and shutdown. The smooth section in the middle of the Double Headed Screw can absorb some thermal stress, and its own elastic elongation can compensate for thermal deformation, preventing thread seizing or connection failure.
Fine-tuning and Positioning Function
In electronic equipment assembly, Double-Ended Threaded Connectors are often used as support columns. By rotating the nut, fine-tuning and positioning of the upper PCB board or components can be achieved, ensuring assembly accuracy.
Detailed Specifications – Every Feature Has a Manufacturing Process
End Chamfer Angle
The guide cone angle at the Double-Headed Machine Screw is generally 35°–45°, facilitating easy insertion without generating chips; the locking end chamfer is 15°–20°, ensuring smooth nut screwing in without scratching the starting teeth of the thread.
01
Thread Finishing Structure
A smooth transition finish (no steps) is used to prevent nut jamming during installation; a fully threaded, unfinished finish (machined relief groove) can be customized for easy thread penetration throughout the entire length.
02
Smooth Rod Diameter Control
If the intermediate smooth rod needs to withstand radial positioning or shear force, we precision grind the outer diameter to h11 or f7 tolerances and mark the concentricity requirements.
03
Identification and Traceability
Strength grade (e.g., 10.9), material code, or production batch can be printed on non-exterior surfaces for easy on-site sorting and quality traceability.
04
Deburring and Cleaning
All Dowel Screw undergo vibratory grinding or centrifugal polishing to remove burrs, followed by ultrasonic cleaning to remove oil, allowing direct use on the assembly line without secondary cleaning.
05
contact us
Whether it's standard specification procurement or complex non-standard structure development, our engineering team can provide one-stop technical support from material selection and structural optimization to mass manufacturing, based on your drawings, application environment, and assembly requirements, helping your M8 Double Ended Dowel Screw achieve more reliable and efficient connection designs.
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