Stainless Steel Carbon Steel Black Oxide Zinc Plated Double Head Stud Bolt

This series of double-ended screws (also known as double-ended bolts or studs) are non-head double-threaded fasteners specially designed for heavy-duty connection scenarios in equipment, machinery, and steel structures. Both ends are machined with standard metric threads, and they can be directly used with nuts to achieve rigid connection between two components. The products cover two core structures and four main versions, suitable for different working conditions:

Structural classification: Full-threaded studs (the entire body of the stud has threads, suitable for short-distance connections), Semi-threaded studs (the middle part is a smooth body, and both ends have threads, suitable for long-distance connections and alignment requirements);

Material and coating versions: 304 stainless steel model, carbon steel blackening model (high strength), carbon steel colored zinc model, carbon steel blue-white zinc model, respectively suitable for different requirements from routine conditions to heavy loads, humid environments, and outdoor conditions.

The studs are produced by a cold forging / turning integrated forming process. The threads are precision rolled, the tooth shape is regular, and the tolerance is strictly controlled. They are perfectly compatible with standard nuts, have tight engagement without slippage; the body strength is uniform and stable, capable of withstanding high tensile loads, and are universal core fasteners for heavy-duty connection scenarios in industrial equipment, machinery, and steel structures.

Core structure: Double-threaded without head design, divided into full-threaded (the entire rod body has threads) and half-threaded (the middle part of the rod body is smooth, with threads at both ends) two types of structures.

Material and coating: 1. 304 stainless steel model: No coating, original corrosion resistance; 2. Carbon steel blackening model (8.8/10.9 grade): Heat treatment strengthened, matte and wear-resistant anti-rust, high strength suitable for heavy load; 3. Carbon steel color zinc / blue-white zinc model: Galvanized and passivated, bright and rust-resistant, outstanding cost performance.

Specification coverage: Thread specifications M3-M30 are complete, length 10-300mm are selectable, supports non-standard length and pitch customization.

Performance: High strength against stretching and shear, stable thread engagement and anti-loosening, different models respectively meet the requirements of anti-corrosion, wear resistance, and heavy load.

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

Double-threaded without head design, suitable for narrow / enclosed spaces

The headless structure allows the installation of nuts from both ends, without the need to reserve space for a wrench, perfectly adapting to equipment cavities, narrow installation spaces, or scenarios requiring simultaneous fixation at both ends, solving the problem of ordinary bolts being unable to be installed.

Multiple materials and structures, precise adaptation for all working conditions

Stainless steel model: native salt spray resistance and corrosion resistance, suitable for outdoor and coastal humid environments;

Carbon steel blackened model (8.8/10.9 grade): high-strength heat treatment, suitable for heavy load and high-torque working conditions;

Carbon steel galvanized model: outstanding cost performance, excellent rust prevention performance, is the preferred choice for conventional indoor and outdoor working conditions;

Full-thread / half-thread structure: full-thread model is suitable for short-distance connections, half-thread model is suitable for long-distance connections and component alignment, without the need for additional customization to cover different connection requirements.

Precise thread processing, stable engagement without slippage

The thread is formed by CNC rolling process, with regular tooth shape and strict tolerance control, perfectly adapting to standard nuts, smoothly tightening without jamming, maintaining stable engagement performance after repeated disassembly, not prone to slippage or disengagement, ensuring the reliability of heavy-load connections.

Integrated molding process, strong and durable

The bolt body is formed by cold heading / turning integration, without welding or splicing, the rod body strength is uniform and stable; High-strength blackened model is strengthened by heat treatment, excellent tensile and shear performance, long-term heavy-load use is not prone to fracture or deformation, ensuring the safety of equipment connections.

Full range of specifications, strong versatility

Thread specifications cover M3-M30, length 10mm-300mm are selectable, supports national standards, German standards, etc., and can be customized for non-standard lengths and tooth pitches, suitable for the connection requirements of most industrial equipment, machinery, and steel structures, reducing procurement and inventory costs.

Industrial equipment and machinery scenarios

The high-strength blackening model is suitable for connecting the frames of machines, pump bodies, reducers and other equipment, with excellent tensile and shear resistance, suitable for heavy-load conditions; the stainless steel model is suitable for chemical and food processing equipment, corrosion-resistant to meet hygiene and safety requirements; the galvanized model is suitable for regular equipment assembly, with high cost-effectiveness and suitable for batch production.

Steel structure and construction engineering scenarios

Suitable for component connections of steel structure factories, bridges, and supports; the semi-threaded model can achieve precise alignment of components, while the full-threaded model is suitable for short-distance connections; the stainless steel model is suitable for outdoor steel structures, resistant to salt fog and corrosion, and not affected by sun exposure or rain; the galvanized model is suitable for regular construction projects, with rust prevention performance meeting the needs of construction sites.

Outdoor and humid environment scenarios

The 304 stainless steel model is suitable for outdoor equipment, photovoltaic support components, garden machinery, etc., resistant to salt fog, acid and alkali corrosion, not affected by sun exposure or rain, and does not rust or loosen over a long period, reducing maintenance costs in the future; the galvanized model is suitable for the fixation of regular outdoor equipment, with rust prevention performance meeting general outdoor requirements.

Outdoor and transportation scenarios

Suitable for connections of automotive engines and chassis components; the high-strength blackening model is suitable for heavy-load conditions, the stainless steel model is suitable for exposed components of vehicles, corrosion-resistant and does not rust; the semi-threaded model can achieve precise alignment of components, ensuring the stability of vehicle operation.

General heavy-load connection scenarios

The four versions are all suitable for various scenarios requiring heavy-load rigid connections, such as pressure vessels, mold fixtures, large equipment bases, etc. They can be flexibly selected based on budget, working conditions, and connection distance, without the need for additional customization. It is a universal fastener for heavy-load connection scenarios.

Q: What are the available thread standards for your Double Head Stud Bolt?

A: We offer stud bolts in various thread standards, including metric (ISO) and imperial (UNC, UNF). You can specify the thread standard you need when placing an order, and we will ensure that the stud bolts meet your requirements.

Q: Can you provide custom - made Double Head Stud Bolts?

A: Yes, we can provide custom - made stud bolts. If you have specific requirements regarding the diameter, length, thread pitch, or material, our engineering team can work with you to develop a customized solution.

Q: How do I ensure the proper installation of your Double Head Stud Bolt?

A: Proper installation is crucial for the performance of the stud bolt. We recommend using the correct torque values when tightening the nuts. You can refer to our installation guidelines or consult our technical support team for detailed information on the installation process.