HIGH-STRENGTH HEXAGON NUT FOR STEEL STRUCTURE — PRODUCT INTRODUCTION

The high-strength hexagon nut for steel structures is a core component of steel structure bolt connection pairs. It is designed and manufactured according to the national standard GB/T 1229, and must be used in conjunction with GB/T 1228 high-strength hexagon head bolts and GB/T 1230 high-strength washers. The technical conditions comply with the provisions of GB/T 1231. The performance grades of the nut are divided into 10H grade (matched with 10.9S bolts) and 8H grade (matched with 8.8S bolts), with specifications typically ranging from M12 to M30 and above. Through enlarged wrenching flats, optimized thickness, and strict heat treatment processes, this nut ensures that when paired with high-strength bolts, it can withstand extremely high preload forces, serving as the foundational fastener for the reliability of friction-type or bearing-type steel structure connections.

I. PRODUCT FEATURES

LARGE HEXAGON HEAD SHAPE DESIGN: The wrenching flats and corner-to-corner dimensions are larger than those of ordinary hexagon nuts, increasing the wrench gripping area and torque transmission efficiency. The nut is less prone to slipping during tightening, making it especially suitable for overhead and field operations.

OPTIMIZED LOAD-BEARING STRUCTURE: The nut thickness is precisely calculated to ensure sufficient thread engagement length with the bolt, enabling it to withstand high preload without thread disengagement or deformation.

STRICT HEAT TREATMENT AND HARDNESS CONTROL: Manufactured from premium medium-carbon steel or alloy steel, subjected to quenching and tempering treatment. Hardness is uniform and forms a reasonable gradient with the bolt, combining high strength with good toughness.

MATCHED TORQUE COEFFICIENT FOR CONNECTION PAIRS: Thread precision, surface lubrication condition, and bolts and washers from the same batch are strictly matched to ensure the connection pair’s torque coefficient is stable with minimal dispersion, guaranteeing controllable preload.

II. PRODUCT ADVANTAGES

RELIABLE CONNECTION WITH EXCELLENT FATIGUE RESISTANCE: Precisely matched with bolts, it stably establishes and maintains high preload, giving steel structure joints outstanding fatigue resistance and anti-loosening performance under dynamic loads and alternating stresses.

CONVENIENT CONSTRUCTION WITH STRONG ADAPTABILITY: The large hexagon design works well with electric or hydraulic torque wrenches, making tightening convenient and suitable for large-scale steel structure installation in complex environments.

TRACEABLE QUALITY AND EASY INSPECTION: Products are managed by batch number and shipped with quality inspection reports. After on-site installation, preload can be verified through final tightening torque or turn-angle methods, ensuring standardized quality control.

HIGH STANDARDIZATION WITH EXCELLENT INTERCHANGEABILITY: Strictly conforming to national standards, it is universally compatible with other national standard steel structure connectors. Market supply is abundant and procurement and acceptance procedures are well-established.

III. APPLICATION SCOPE

HIGH-RISE AND SUPER HIGH-RISE BUILDINGS: Rigid connection nodes of steel columns and beams, and core load-bearing areas of frame structures.

LARGE-SPAN SPATIAL STRUCTURES: Steel truss and grid node connections in sports stadiums, exhibition centers, and airport terminals.

HEAVY INDUSTRIAL PLANTS: Fastening of crane beams and inter-column bracing in metallurgical, shipbuilding, and heavy machinery manufacturing plants.

BRIDGE ENGINEERING: Box beams, truss members, and crossbeam node splicing in highway and railway steel bridges.

TOWERS AND TALL STRUCTURES: Flange fastening of power transmission towers, communication towers, wind turbine towers, and outdoor billboard structures.