High-Strength Hex Bolts (also known as large hex bolts) are heavy-duty fasteners engineered to deliver exceptional tensile and shear strength in demanding structural applications. Characterized by their prominent hexagonal heads for high-torque tightening, these bolts are manufactured from carbon steel (Grades 8.8, 10.9, 12.9), alloy steel, or stainless steel (316) to withstand extreme loads and harsh environments.
- Material:
- Carbon Steel: Grade 8.8 (min tensile 800 MPa), Grade 10.9 (1,000 MPa), Grade 12.9 (1,200 MPa).
- Alloy Steel: ASTM A325, A490 for high-strength structural use.
- Stainless Steel: 316 (marine-grade, corrosion-resistant).
- Size Range:
- Diameter: M12–M100 (metric) / 1/2"–4" (imperial).
- Length: 30–500 mm (custom lengths up to 1,000 mm available).
- Design Features:
- Head Dimensions: Oversized hexagon heads (ISO 4014, ASME B18.2.1) for wrench/socket torque.
- Thread: Full or partial threads; coarse pitch for quick installation.
- Finish: Hot-dip galvanized (HDG, ASTM A153), Dacromet, or black oxide.
- Standards Compliance:
- EN 14399 (Eurocode), ASTM F1852 (USA), GB/T 1228 (China).
- Standard Carbon Steel (Grades 8.8/10.9): 1,000 pieces (common sizes in stock).
- Alloy Steel (A325/A490): 500 pieces (project-based orders).
- Stainless Steel (316): 2,000 pieces (custom lengths available).
Factory Advantages: ISO 9001-certified production, 100% torque testing, support for non-standard sizes, special coatings (e.g., zinc-aluminum for offshore use), and bulk orders with lead times of 15–35 days.
- Structural Steel Construction: Connecting beams, columns, and trusses in bridges, high-rise buildings, and industrial plants.
- Heavy Machinery: Securing engines, gearboxes, and frames in mining, construction, and agricultural equipment.
- Renewable Energy: Anchoring wind turbine foundations, solar panel structures, and power plant components.
- Oil & Gas: Bolting pipelines, storage tanks, and offshore platforms (corrosion-resistant alloy steel options).
- High Load Capacity: Tensile strength up to 1,200 MPa (Grade 12.9) for critical load-bearing applications.
- Corrosion Resistance:
- HDG coatings (1,000+ hours salt spray) for outdoor/coastal use.
- Dacromet (2,000+ hours salt spray) for extreme industrial environments.
- Safety Assurance: Compliant with global structural codes, reducing risk of connection failures.
- Non-Standard Sizes: Oversized diameters (M120+), extended lengths, or custom thread pitches.
- Special Coatings: PTFE (anti-seize), epoxy (color-coded), or zinc-nickel plating.
- Engineering Support: Free technical drawings, torque calculation guidance, and load test reports.
Contact Us
Request a quote for high-strength hex bolts tailored to your project! Factory-direct pricing and worldwide shipping for large-scale infrastructure, industrial, and renewable energy needs.
JH Bolt Co., Ltd is a professional manufacturer of different types of bolts with more than 15 years rich manufacturer experience. The factory area is more than 1500 squares with more than hundreds different types ofnevproduction machines. There are more than 50 people who work here for at least 5 years.With quality &customer frst, staffs second, then company, Our products are widely recog-nized and trusted by users all over the world. Proft for the development of communication, We are here for you 12 hours a day, 7 days a week!
