Hexagonal Head Bolt for Steel Structure


Set: Bolt + nut + flat washer; supplied as a complete set, not sold separately
Specifications: Common sizes M16/M20/M22/M24; custom lengths available
Surface treatment: Blackening, hot-dip galvanising
Installation: Use a torque wrench to control the preload; high-strength bolts must not be reused under any circumstances


Product Advantages


  • High load-bearing capacity, safe and reliable: Subjected to quenching and tempering heat treatment, these connectors transmit forces via pre-tensioned friction, offering excellent slip resistance and making them suitable for primary load-bearing joints in industrial buildings, high-rise structures and bridges.
  • Outstanding seismic and fatigue resistance: High connection stiffness ensures uniform load distribution, minimising the risk of loosening under long-term dynamic loads.
  • Controllable installation: Utilising the torque method, pre-tension can be quantitatively controlled; project acceptance standards are well-established and enjoy high levels of acceptance amongst project supervisors.
  • Extensive corrosion protection options: Supports blackening, hot-dip galvanising and Dacromet coatings, suitable for indoor, outdoor and chemical corrosion environments.
  • Standardised kits: Bolts, nuts and washers are supplied as matched sets, preventing substandard load-bearing performance caused by the mixing of incompatible components.

Why Choose Us


Controllable raw materials ensure more consistent quality
We source compliant wire rod directly from steel mills, eliminating the use of recycled scrap; we independently oversee key processes such as heat treatment, thread rolling and galvanising, effectively preventing major engineering hazards such as bolt brittle fracture, thread slippage and substandard tensile strength. We can provide material certificates.

Hexagonal Head Bolt for Steel Structure

A complete set of quality inspection documentation to meet inspection requirements
With our in-house laboratory or regular third-party testing, each batch is accompanied by a certificate of conformity, mechanical properties report and anti-slip test data, resolving acceptance challenges for site supervisors.

Price advantage, with no mark-ups from intermediaries
We manufacture and sell directly, eliminating multi-tiered distribution mark-ups; we offer tiered pricing for large orders, and long-term framework agreements can be negotiated to lock in prices, thereby mitigating the risk of steel price increases.

Heavy Steel Structural Hex Bolts

Stable production capacity and controllable lead times
With our own production lines, standard specifications are always in stock; large-scale projects are given priority in production scheduling, and we support delivery in batches to minimise the risk of construction site downtime due to material shortages.

Customisation capabilities
We can customise special lengths, thicker hot-dip galvanised coatings, non-standard specifications and special packaging (small site-specific packs / tonne bags), and provide matching washer and nut combinations as required.

10.9S large hexagonal structural bolts

Professional Technical Support
We are well-versed in steel
structure regulations and can assist customers with product selection (distinguishing between 4.8, 8.8S and 10.9S grades, and recommending corrosion protection solutions). We provide guidance on storage, handling and transportation during construction, helping customers avoid issues requiring rework during final inspection.

Clear After-Sales Responsibility
We liaise directly with the production side; in the event of quality issues, we can quickly trace the source and resolve the matter, with clear accountability—unlike traders who often pass the buck through multiple layers of communication. In the event of damage during transport, we can arrange for replacement deliveries upon consultation.

Hexagonal bolts for steel structures are highly standardised and easy to install and dismantle; the high-strength hexagonal bolt sets offer excellent load-bearing capacity and seismic performance, making them suitable for main joints in steel structures, with a variety of anti-corrosion options available to suit different operating conditions. As a direct manufacturer, we source raw materials directly and carry out our own heat treatment, ensuring quality control and the provision of a full set of inspection documentation; with no mark-ups from intermediaries, ample stock, customisation options and reliable delivery times, we also offer technical support for product selection, and preferential pricing is available for long-term partnerships.