Carbon steel hexagonal bolt

Hex bolt, also known as hexagon head bolt, is widely used for fastening and connecting mechanical components, steel structures and industrial equipment.

ZSD Screw specialize in high-strength carbon steel hex bolts designed for demanding structural and industrial use. By integrating in-house production with rigorous quality control, ZSD Screw delivers reliable, international-standard fasteners directly to global customers, ensuring maximum stability and performance.

Standard hex bolt dimensions are manufactured according to DIN, ISO and ASTM standards.Custom drawings and samples are accepted.

Type: Hexagon Head Bolt.
Diameter Range: M2 – M64.
Length Range: 8 mm – 300 mm.
Thread Type: Metric / UNC / UNF.
Thread Form: Full Thread / Partial Thread.
Standard: DIN 931 / DIN 933 / ISO 4014 / ISO 4017 / ASTM A307 / ASTM A325.
Tolerance: According to standard or customer drawing.
We supply hex bolts in a wide range of materials including:Carbon Steel (Q235, 35#, 45#) Alloy Steel (40Cr, SCM435, SCM440)Stainless Steel (304, 316, 316L) Brass, Aluminum and Titanium (on request)

Strength Grades:  Hex bolts are available in different strength grades to meet various load requirements: 4.8, 8.8, 10.9, 12.9, 14.9.  ASTM grades: ASTM A307,ASTM A325,ASTM A490.  Heat treatment is completed in-house to ensure stable mechanical properties and reliable performance.

Surface Treatment:  To improve corrosion resistance and service life, we offer the following surface finishes: Zinc plated (blue / white / yellow). Black oxide. Hot dip galvanized. Zinc flake coating. Phosphate. Dacromet. Special surface treatments are available according to customer requirements.

Applications:  In mechanical equipment manufacturing, ZSD Screw carbon steel hex bolts are widely used for assembling machine frames, transmission systems, gearboxes, motors, pumps, compressors, and automated production equipment. These applications require stable preload control and consistent tensile performance to ensure long-term operational safety under continuous vibration and cyclic loading. Precision thread rolling and controlled heat treatment processes provide uniform mechanical properties, helping maintain joint integrity during extended service cycles.

In electronic equipment and industrial electronics, carbon steel hex bolts are applied in equipment housings, control cabinets, industrial enclosures, power distribution frames, and supporting brackets. Reliable fastening performance is critical for maintaining alignment accuracy, grounding stability, and vibration resistance in precision systems. ZSD Screw supplies bolts suitable for both structural fastening and auxiliary mounting applications, supporting stable assembly in manufacturing lines, testing equipment, and control systems.

In the new energy sector, carbon steel hex bolts from ZSD Screw are used in solar mounting systems, photovoltaic support structures, inverter frames, battery rack systems, and energy storage equipment assemblies. These applications require stable load-bearing performance and long-term durability under outdoor exposure, temperature variation, and continuous mechanical stress. Controlled material selection and surface treatment processes help improve corrosion resistance and extend service life in renewable energy installations.

In conventional and renewable power generation facilities, these bolts are applied in generator foundations, turbine housings, auxiliary equipment frames, cooling systems, and pipeline supports. Secure fastening performance is essential for maintaining structural stability under high loads, thermal expansion, and long-term vibration. ZSD Screw provides fastening solutions that support safe assembly and reliable operation in thermal power plants, wind power systems, hydropower equipment, and energy infrastructure projects.

In the automotive and transportation industries, ZSD Screw carbon steel hex bolts are used in chassis assemblies, engine mounting systems, suspension components, transmission brackets, and body structure connections. These critical joints require consistent strength performance, fatigue resistance, and dimensional accuracy to ensure vehicle safety and durability under dynamic driving conditions. Stable production control ensures reliable fastening quality across high-volume manufacturing and aftermarket applications.

In heavy industry and engineering equipment manufacturing, these bolts are widely applied in construction machinery, mining equipment, lifting systems, steel structure installations, and large-scale mechanical assemblies. Applications such as cranes, excavators, conveyors, and processing equipment require high clamping force and dependable load transmission under heavy static and impact loads. ZSD Screw supplies fastening components designed to support long-term structural integrity and safe operation in demanding industrial environments.