Custom black oxide double-end bolt double-headed bolt stud bolt Step double-ended studs

This series of high-strength stepped double-head screws are integrated double-threaded fasteners specifically designed for equipment, molds, tooling, and other scenarios where heavy loads and precise positioning are required. They feature an integrated structure of "both ends with threads + middle stepped positioning shoulder", allowing for precise axial positioning of components. The two ends of the threads are matched with nuts to achieve locking, providing both connection and positioning functions. They solve the problem that ordinary double-head screws cannot achieve precise alignment and axial positioning of components.

The product is formed by one-piece turning of high-strength medium-carbon steel and undergoes heat treatment to achieve a hardness of 8.8/10.9 grades. The surface is blackened and passivated, featuring both wear resistance and rust prevention properties as well as a matte industrial texture. The two ends of the threads are precisely rolled and have regular tooth shapes and strict tolerances, perfectly matching standard nuts, with a tight and non-slipping bite, making them a dedicated core fastener for heavy-load positioning connections in industrial equipment, mold tooling, steel structures, and other scenarios.

Core structure: Integrated design of standard threads at both ends and a stepped positioning shoulder, featuring dual functions of connection and positioning, enabling precise alignment of components.

Material and treatment: High-strength medium-carbon steel material, heat-treated for strength (8.8/10.9 grades), surface blackening and passivation treatment, wear-resistant and rust-proof.

Specification compatibility: Thread specifications M4-M24 are selectable, step diameter and height can be customized, suitable for different workpiece hole positions and connection requirements.

Performance: High-strength tensile and shear resistance, precise positioning and anti-displacement, wear-resistant and rust-proof, suitable for heavy loads and complex working conditions.

Installation compatibility: Compatible with standard nuts, can be installed from both ends, no need to reserve space for a wrench, suitable for narrow / enclosed spaces and workpiece assembly scenarios.

The step positioning shoulder design enables precise alignment of components.

The middle step positioning shoulder can directly fit the hole position of the workpiece, restricting axial displacement, achieving rapid and precise alignment of the components without the need for additional positioning pins, simplifying the assembly process, and ensuring the coaxiality of the components, thereby enhancing the stability of the equipment operation.

High-strength heat treatment, suitable for heavy-duty conditions

Using high-strength medium-carbon steel material, it is strengthened through heat treatment, with high tensile strength and excellent shear performance, capable of withstanding high tensile loads, suitable for heavy-duty connection scenarios such as equipment, molds, and tooling, and not prone to deformation or fracture over long-term use, ensuring the reliability of the connection.

Blackening and passivation treatment, wear-resistant and rust-resistant, suitable for complex conditions

The surface undergoes high-temperature blackening and passivation treatment, forming a dense oxide film, with excellent wear-resistant and rust-proof properties, capable of withstanding workshop oil stains and water vapor corrosion, with a matte appearance that is low-key and elegant, not affecting the overall appearance of the equipment, suitable for complex conditions in industrial workshops.

Double-thread integrated molding, suitable for narrow / enclosed spaces

The headless double-thread structure can be installed with nuts from both ends, without the need to reserve space for wrench operation, perfectly adapting to equipment cavities, narrow installation spaces, or scenarios requiring simultaneous fixation at both ends, solving the problem of ordinary bolts not being installable.

Precise thread processing, stable engagement without slippage

The threads at both ends are formed by CNC rolling process, with regular tooth shapes and strict tolerance control, perfectly matching standard nuts, smoothly tightening without jamming, maintaining stable engagement performance even after repeated disassembly and assembly, not prone to slippage or disengagement, ensuring the reliability of heavy-duty connections.

Non-standard customization is flexible, suitable for various tooling equipment

Customization of different step diameters, heights, different thread specifications, and lengths of step screws according to customer requirements, suitable for special positioning connection needs of non-standard tooling, molds, and equipment, the R&D team can quickly complete drawing design and sample prototyping, meeting personalized customization requirements.

Industrial equipment and machinery scenarios

The frame connection for machines, pump bodies, reducers and other equipment, and the step positioning shoulders ensure precise alignment of components. The high-strength material is suitable for heavy-load conditions, and the blackened surface is wear-resistant and rust-proof. It is suitable for complex workshop conditions and ensures the long-term stable operation of the equipment.

Mold and tooling fixture scenarios

The template connection and positioning for stamping molds and injection molds, the step positioning shoulders achieve the control of mold coaxiality. The high-strength material can withstand the impact loads of mold opening and closing, and is not prone to deformation over a long period of use, thereby enhancing the mold service life and processing accuracy.

Steel structure and engineering equipment scenarios

The frame connection for steel structures and engineering machinery, the step positioning shoulders achieve quick alignment of components. The high-strength material is suitable for heavy-load conditions, and the blackened surface is rust-proof and wear-resistant. It is suitable for the oil stains and water vapor environment of construction sites, ensuring the safety and stability of engineering equipment.

Automation equipment and tooling scenarios

The connection of tooling fixtures for automated production lines, the step positioning shoulders achieve quick positioning of tooling, improving assembly efficiency. The high-strength material can withstand the repeated impact loads of automated equipment, and is not prone to deformation or loosening, thereby ensuring production stability.

General heavy-load positioning connection scenarios

Various heavy-load scenarios that require simultaneous connection and axial positioning, such as pressure vessels, large equipment bases, and transmission component connections, can be customized with non-standard specifications according to requirements. No additional positioning pins are needed, simplifying the assembly process and reducing costs.