Carbon steel flange bolt(Serrated/Plain)

Carbon steel flange bolt, also known as hex flange bolt, is widely used for fastening and connecting mechanical components, steel structures and industrial equipment. The integrated washer-like flange under the bolt head increases the bearing surface, distributes clamping load more evenly, and helps reduce loosening under vibration. This product is available in two types: serrated flange bolts (with teeth) for enhanced anti-slip performance, and non-serrated flange bolts (without teeth) for applications requiring surface protection or use with washers.

ZSD Screw specialize in high-strength carbon steel flange bolts designed for demanding structural and industrial use. With fully integrated in-house production covering cold heading, precision thread rolling, heat treatment, surface finishing, and mechanical property inspection, ZSD Screw ensures strict dimensional control and stable strength performance. Each production batch undergoes hardness testing, tensile verification, and thread accuracy inspection to meet international standards, delivering reliable fastening solutions directly to global customers.

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

Type: Hex Flange Bolt (Serrated / Non-Serrated)
Diameter Range: M5 – M24
Length Range: 10 mm – 200 mm
Thread Type: Metric / UNC / UNF
Thread Form: Full Thread / Partial Thread
Standard: DIN 6921 / ISO 4162 / ASTM A307 / ASTM A325
Tolerance: According to standard or customer drawing.

We supply flange 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: Flange 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, controlled hardness range, and reliable tensile and yield 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 flange bolts are widely used for assembling machine frames, transmission systems, gearboxes, motors, pumps, compressors, and automated production equipment. The integrated flange design increases load distribution, while serrated types provide additional anti-loosening performance under vibration. These applications require stable preload control and consistent tensile performance to ensure long-term operational safety under cyclic loading conditions.

In electronic equipment and industrial electronics, carbon steel flange bolts are applied in equipment housings, control cabinets, industrial enclosures, and supporting brackets. Non-serrated flange bolts are commonly selected where surface protection and stable clamping are required. Reliable fastening performance helps maintain alignment accuracy, grounding continuity, and vibration resistance in precision systems.

In the new energy sector, carbon steel flange bolts from ZSD Screw are used in solar mounting systems, photovoltaic support structures, inverter frames, battery rack systems, and energy storage assemblies. Serrated flange bolts enhance anti-slip performance in dynamic environments, while corrosion-resistant surface treatments improve durability under outdoor exposure and temperature variation.

In conventional and renewable power generation facilities, these bolts are applied in turbine housings, generator assemblies, auxiliary equipment frames, cooling systems, and structural supports. The wide bearing surface of flange bolts contributes to secure fastening performance under high loads and thermal expansion conditions. ZSD Screw ensures stable mechanical properties to support long-term operational reliability in energy infrastructure projects.

In the automotive and transportation industries, ZSD Screw carbon steel flange bolts are widely used in chassis assemblies, engine systems, suspension components, and transmission brackets. Serrated flange bolts are commonly applied where enhanced vibration resistance is required, reducing the need for separate washers. Consistent dimensional accuracy and fatigue-resistant strength performance support vehicle safety and durability in dynamic driving environments.

In heavy industry and engineering equipment manufacturing, these bolts are extensively applied in construction machinery, mining equipment, lifting systems, steel structure installations, and large-scale mechanical assemblies. Applications such as cranes, excavators, and processing equipment require high clamping force and dependable load transmission under heavy static and impact loads. ZSD Screw provides precision-manufactured flange bolts designed to maintain structural integrity and safe operation in demanding industrial conditions.