Carbon steel hexagonal countersunk head bolt

Hexagonal countersunk head bolt, also known as hex socket countersunk head bolt, is widely used for fastening and connecting mechanical components, steel structures and industrial equipment where a flush surface finish and internal hex drive are required.

ZSD Screw specialize in high-strength carbon steel hexagonal countersunk head bolts designed for structural stability and precision assembly. By integrating in-house production with rigorous quality control, ZSD Screw delivers reliable, international-standard fasteners directly to global customers, ensuring consistent mechanical performance and dimensional accuracy in demanding industrial environments.

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

Type: Hexagonal Countersunk 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 7991 / ISO 10642 / ASTM equivalent standards
Tolerance: According to standard or customer drawing.
We supply hexagonal countersunk head 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: Hexagonal countersunk head 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 (where applicable). 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 countersunk head bolts are widely used for assembling precision components, machine frames, tooling systems, and structural panels where a smooth surface and strong clamping force are required. The countersunk head design allows the bolt head to sit flush with the surface, reducing interference with moving parts and improving structural alignment under continuous vibration and cyclic loading.

In electronic equipment and industrial electronics, carbon steel hexagonal countersunk head bolts are applied in equipment housings, control cabinets, industrial enclosures, and mounting brackets. Flush installation supports compact structural design while maintaining reliable fastening strength and alignment accuracy in precision systems.

In the new energy sector, carbon steel hexagonal countersunk head bolts from ZSD Screw are used in photovoltaic mounting structures, inverter frames, battery systems, and energy storage assemblies. These applications require stable load-bearing performance and corrosion resistance under outdoor exposure, temperature variation, and mechanical stress.

In conventional and renewable power generation facilities, these bolts are applied in generator components, turbine housings, auxiliary equipment frames, cooling systems, and structural supports. Secure fastening performance is essential for maintaining structural stability under high load, thermal expansion, and long-term vibration conditions.

In the automotive and transportation industries, ZSD Screw carbon steel hexagonal countersunk head bolts are used in chassis assemblies, engine systems, transmission components, and body structures where flush surface fastening is necessary. Consistent strength performance and dimensional precision contribute to safe and durable operation under dynamic driving conditions.

In heavy industry and engineering equipment manufacturing, these bolts are widely applied in construction machinery, mining equipment, lifting systems, steel structure installations, and large mechanical assemblies. Equipment such as cranes, excavators, conveyors, and processing systems require dependable load transmission and stable fastening performance. ZSD Screw supplies fastening components designed to maintain long-term structural integrity and operational reliability in demanding industrial environments.