Double End Threaded Rod
Products Description
Double End Threaded Rods differ from ordinary bolts in that their structure and function lean more towards a composite role of "connecting shaft + locking element," possessing the following significant characteristics:
Double-ended thread design: One end can be fixed to the threaded hole in the base material, while the other end is used for locking external components.
Stable center section: Effectively transmits axial tensile and shear forces.
Flexible assembly: Suitable for systems requiring multiple position adjustments or repeated disassembly and assembly.
High versatility and compatibility: Can be used with various nuts, washers, or inserts.
This structure makes it not only a fastener in engineering applications but also a crucial component for structural positioning and force distribution.
Core Processing Flow
Rod Forming
The Double Ended Bolt is machined using a precision lathe to ensure the diameter tolerance and straightness of the smooth middle section, with thread machining allowance reserved at both ends.
01
Double-End Threading
A double-end thread rolling machine is used to simultaneously machine the threads at both ends. A dedicated mold controls the thread profile and precision. The thread rolling process does not cut the material, preserving the original strength of the thread. For threads of different specifications, a step-by-step thread rolling process is used to ensure that the threads at both ends are formed independently and meet the precision standards.
02
Precision Straightening
The machined Double Ended Lag Bolt is straightened using a fully automatic straightening machine to eliminate bending deformation caused during processing, controlling the straightness error within the standard range.
03
Surface Treatment
Depending on the material and customer requirements, surface treatments such as galvanizing, passivation, blackening, and phosphating are performed. After treatment, the surface is cleaned and dried to ensure no residual agents and a uniform coating.
04
Inspection and Packaging
Automated inspection equipment (thread detector, straightness measuring instrument, tensile strength tester) screens out unqualified Double Ended Machine Screws. Qualified products are packaged according to specifications, labeled with material, specifications, and batch information for easy traceability and inventory management.
05
Application Advantages: Demonstrating Value in Critical Fields
| Mechanical Connections | Used for connecting large motors, reducers, pumps, valves, and other equipment to their bases. One end of the stud is pre-fixed to the base, greatly simplifying the installation, disassembly, and alignment maintenance of heavy equipment. |
| Pipeline Installation | In flange connections of high-temperature and high-pressure pipelines, Double-End Threaded Stus are more reliable than bolts. One end can be firmly welded to the flange, avoiding the risk of bolt rotation during tightening and ensuring a tight seal. |
| Mold Manufacturing | Used in injection molds and die-casting molds to connect the mold core and mold cavity. Its high precision and strength ensure that the relative positions of the mold components remain constant under enormous injection pressure and frequent temperature cycles, a lifeline for ensuring Double Ended Hex Bolt accuracy. |
| Building Structures | Used for bolted ball joints and embedded part connections in steel structure buildings. Its smooth spur can act as a shear key to withstand lateral shear forces, while the thread provides strong axial tensile force, together forming a safe building structure. |
| Electronic Equipment Assembly | Used in precision electronic equipment to fix heat sinks, power modules, etc. Its excellent electrical conductivity (such as copper studs) or insulation (such as those with nylon coatings), as well as its precise positioning function, meet the special requirements of electronic devices for heat dissipation, shock resistance, and electromagnetic compatibility. |
Complete Surface Treatment System
Based on material and application, we offer complete surface treatment solutions:
Zinc Plating (Carbon Steel): Utilizing an environmentally friendly zincate process, the coating is dense, uniform, and has strong adhesion, providing reliable cathodic protection. Standard zinc plating, blue-white passivation, or colored passivation is available upon request.
Passivation Treatment (Stainless Steel): Strengthens the surface chromium oxide film through chemical methods, improving corrosion resistance and removing free iron ions to prevent rust contamination.
Blackening/Phosphating: Forms a porous phosphate conversion film, providing both rust prevention and oil retention. Dual Threaded Screw effectively reduces the coefficient of friction, making it particularly suitable for applications requiring frequent adjustments.
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