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Fully threaded studs are headless, rod-like fasteners featuring continuous, unbroken external threads along their entire length, with no unthreaded (plain) section in the middle. They are secured by applying nuts, flat washers, and spring washers at both ends to achieve dual-directional locking. Manufactured through a combination of bar-stock machining and thread rolling, these studs allow nuts to be threaded and positioned anywhere along the rod. Unlike standard double-end studs, they are not constrained by the thickness of the workpiece. Designed for heavy-duty applications—such as high-pressure flanges, piping systems, and heavy machinery—they are capable of withstanding tensile forces and cyclic, alternating loads. Available for bulk supply from stock or as custom-sized, non-standard components, these studs meet the fastening requirements for both general industrial use and demanding environments, including the high-temperature, high-pressure conditions found in the chemical industry.
1. Flexible Assembly and High Length Tolerance: Featuring a fully threaded design, the position of the locking nuts can be adjusted freely based on the actual thickness of the components being joined. This eliminates the need for precise matching of the stud’s total length—even when dealing with varying thicknesses or multiple stacked gaskets—ensuring excellent adaptability on-site.
2. Uniform Load Distribution and Superior Fatigue Resistance: The absence of a transition zone between the threaded and unthreaded (plain) sections prevents stress concentration. Axial loads are distributed evenly across all thread turns, reducing the risk of thread stripping or fracture, making these studs ideal for applications involving long-term vibration or cyclic loading.
3. High Clamping Strength and Reliable Sealing: Capable of withstanding high pre-tension, these studs ensure consistent compression on gaskets in flanged connections. This minimizes the risk of fluid or gas leakage, making them the preferred fastener for high-pressure piping and equipment.
4. Convenient Installation, Removal, and Maintenance: Secured by nuts at both ends, these studs do not need to be threaded directly into the base component. Consequently, repeated disassembly and reassembly will not damage the threaded holes in the base material, leading to greater efficiency during equipment maintenance.
5. Diverse Material and Coating Options: Available in alloy steel for high tensile strength or stainless steel for rust and corrosion resistance. A wide range of surface treatments is offered to suit various operating environments—including high-temperature, humid, or mildly corrosive conditions—with consistent, stable quality across every batch.
Manufacturing Process: Produced from high-quality bar stock using precision thread rolling. The resulting threads are full, well-defined, and feature uniform pitch, ensuring smooth engagement—minimizing the risk of jamming or stripping—while maintaining consistent thread precision.
Structural Design: Fully threaded along the entire length with no unthreaded (plain) sections. Both ends are chamfered to facilitate easy nut engagement and prevent damage to the starting threads.
Mechanical Properties: Strictly adheres to national standards for mechanical properties. Key parameters—such as tensile strength, hardness, and salt-spray resistance—are rigorously controlled; material test reports are available for every batch.
Interchangeability: Thread tolerances are tightly controlled, ensuring full compatibility with nuts and washers of the same specification. Components are ready for assembly without the need for additional modification or rework.
Standard Fully Threaded Studs: The mainstream, general-purpose type, featuring continuous threading along the entire length.
Extended/Extra-Long Fully Threaded Studs: Custom-length, elongated studs designed for applications such as securing thick components, steel structural supports, and anchoring equipment bases.
Short Fully Threaded Studs: Compact-length studs, ideal for fastening multiple thin, stacked layers within confined spaces.
Metric Threads: Commonly available in M10, M12, M16, and M20 sizes.
Nominal Length: Ranges from 25mm to 100mm; custom lengths (longer sizes) can be cut to specification.
Standards: Compliant with HG/T20613, DIN976, and GB/T3098.1; customization for UNC/UNF (American) and BSW/BSF (British) threads is also available.
Recommended Accessories: Can be supplied as a complete set, including matching nuts, flat washers, and spring washers of the same grade.
Petrochemical Industry: Used for fastening pipe flanges, pressure vessels, and high-pressure valves; withstands high temperatures and pressures, ensures effective flange sealing, and prevents media leakage.
Heavy Machinery and Equipment: Used for large machine tools, hydraulic equipment, and gear reducer housings; withstands vibrations and alternating loads, enabling secure through-fastening of thick components.
Power Equipment: Used for power plant piping, transformer supports, and power transmission auxiliary equipment; hot-dip galvanized versions are suitable for humid outdoor environments.
Steel Structure Engineering: Used for equipment bases, support columns, and the connection of stacked multi-layer plates; ideal for assembly points where workpiece thickness varies significantly.
Molds and Tooling: Used for large-scale jigs and fixtures, as well as for clamping and securing multi-layer mold plates; facilitates frequent disassembly, adjustment, and reassembly.
Environmental Protection and Water Treatment: 304/316L stainless steel versions are used for water treatment tanks and pipe fittings, providing resistance to moisture and mild chemical corrosion.
General Industrial Assembly: Used for enclosures, frames, and sheet metal components; suitable for assemblies involving multiple stacked washers or scenarios where workpiece thickness is inconsistent.
