Carbon steel hexagonal half round head bolt

Carbon steel hexagonal half round head bolt, also known as hexagon half round head bolt, is widely used for fastening and connecting mechanical components, steel structures and industrial equipment where a smooth and low-profile head design is required.

ZSD Screw specialize in high-strength carbon steel hexagonal half round head bolts designed for demanding structural and industrial applications. By integrating in-house production, precision cold heading, thread rolling and controlled heat treatment with strict quality inspection procedures, ZSD Screw delivers reliable, international-standard fasteners directly to global customers, ensuring consistent clamping force, dimensional accuracy and long-term service stability.

Standard hexagonal half round head bolt dimensions are manufactured according to DIN, ISO and ASTM standards.Custom drawings and samples are accepted.

Type: Hexagonal Half Round 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 / ISO / ASTM related standards
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 hexagonal half round head bolts are widely used for assembling machinery frames, protective covers, housing structures and connection points where both structural reliability and a smooth head appearance are required. The half round head design helps reduce edge exposure while maintaining secure fastening performance under vibration and cyclic loading conditions.

In electronic equipment and industrial electronics, these bolts are applied in control panels, instrument housings, enclosures and mounting brackets. The rounded head profile improves surface contact and reduces the risk of interference in compact assemblies, while stable tensile performance supports reliable grounding, structural alignment and long-term fastening security.

In the new energy sector, carbon steel hexagonal half round head bolts from ZSD Screw are used in photovoltaic mounting systems, energy storage cabinets, inverter frames and battery support structures. These applications demand consistent preload performance and corrosion protection under outdoor exposure and temperature variation, ensuring structural stability and extended service life.

In conventional and renewable power generation facilities, these bolts are utilized in equipment casings, auxiliary structural supports, cable management systems and infrastructure connections. Secure fastening is essential to maintain structural integrity under continuous vibration, thermal expansion and heavy operational loads across thermal, wind and hydropower installations.

In the automotive and transportation industries, ZSD Screw carbon steel hexagonal half round head bolts are used in body structure assemblies, interior support brackets, chassis components and auxiliary mounting positions. The design supports reliable fastening performance while offering a smooth head profile suitable for visible or space-limited installations, contributing to durability and operational safety.

In heavy industry and engineering equipment manufacturing, these bolts are widely applied in construction machinery, lifting equipment, steel structure projects and large mechanical assemblies. Applications requiring dependable clamping force and impact resistance benefit from controlled material processing and strength performance, supporting long-term structural stability in demanding industrial environments.