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Heavy duty structural hex bolts are manufactured by Zhejiang Chance & Union Import and Export Co., Ltd. for steel-to-steel connections in buildings, bridges, towers, and industrial structures. The heavy hex head has a larger across-flats and across-corners dimension than a standard hex bolt of the same diameter, providing a wider bearing area under the head and improved load distribution in structural joints. These bolts are produced from carbon steel and alloy steel through hot forging, cold heading, thread rolling, and heat treatment. The product line covers heavy hex bolts, heavy hex structural bolts, and non-standard custom structural fasteners. Supported by a 33,350 m² facility and an annual production capacity of 9,500 tons, we supply OEM and ODM orders to more than 25 countries.
Core Advantages
Product Characteristics
Heavy Hex Head
Larger across-flats dimension than standard hex bolts of the same diameter.
Bearing Surface
Wider head contact area for load distribution in structural steel connections.
Strength Grades
Class 8.8, Class 10.9, and ASTM A325 / A490 equivalent grades available.
Diameter Range
Metric and imperial sizes from M12 to M36 and equivalents.
Coating Options
Hot-dip galvanized, black oxide, zinc plating, Dacromet, and plain finish.
Traceability
Digital batch records and material certificates available for each shipment.
Application Areas
Structural Steelwork
Beam-to-column connections, bracing, and moment frames in commercial and industrial buildings.
Bridges and Infrastructure
Steel girder splices, bearing assemblies, and expansion joint connections.
Transmission Towers
Lattice tower joints, cross-arm connections, and foundation interfaces.
Industrial Plants
Equipment skids, pipe racks, and structural supports in processing facilities.
Material Handling
Crane runways, conveyor structures, and racking systems under dynamic loads.
Wind Energy
Nacelle frames, tower flange connections, and foundation anchor interfaces.
Usage Notes
Structural bolts are intended for steel-to-steel connections. Joint design and bolt grade should be specified by the project engineer.
Installation torque and tension should follow the applicable structural specification. Controlled tightening methods are used for critical joints.
Hot-dip galvanized bolts require consideration of coating thickness in hole sizing and thread fit during assembly.
Weathering steel bolts should be matched to the parent steel grade to maintain consistent atmospheric corrosion behavior.
Reuse of high-strength structural bolts is not recommended in critical load-bearing connections.
Storage in dry conditions is advised. Prolonged moisture exposure may affect coating and thread condition before installation.
Frequently Asked Questions
What overall services can you provide for clients?
We provide global customers with one-stop fastener solutions covering the whole process from product R&D and sampling to mass production.
Do you offer non-standard customization service for fasteners?
Yes, we do. Supported by strong R&D and production capacity, we can customize special-shaped and non-standard fasteners with exclusive specifications according to customer drawings, parameters and application requirements.
Which countries and regions do your products export to? How many cooperative clients do you have?
Our products are exported to more than 25 countries worldwide, and we have served over 200 clients at home and abroad with extensive market coverage.
What production processes are applied to your products?
We adopt mature mainstream processes such as cold heading, hot forging and precision machining to guarantee product accuracy and structural strength.
What main fastener products do you supply?
We mainly deal in high-strength bolts, nuts, washers, pins and screws, and also provide all kinds of non-standard customized fasteners.
Leveraging the factory's robust R&D and production capabilities, we specialize in high-strength rivets bolts, nuts, washers, pins, screws, and various non-standard custom parts. As experienced Custom Heavy Duty Structural Hex Bolts Suppliers, we provide flexible manufacturing solutions for different customer requirements. Our product range covers materials including stainless steel, alloy steel, aluminum alloy, copper, and special alloys, utilizing processes such as cold heading, hot forging, and CNC machining. Our products are exported to over 25 countries, serving more than 200 clients.
Chance & Union is committed to seamlessly connecting "Manufactured in China" with the international market, providing global customers with one-stop fastening solutions from R&D to mass production through professional technology and exceptional quality.
