Structural Carbon Steel Heavy Hex Nuts

Structural Carbon Steel Heavy Hex Nuts serve as essential fasteners for steel structures, bridge projects and heavy-duty machinery. Manufactured in accordance with GB/T 3098.2-2025 and GB/T 1231-2006, they are made from medium carbon steel and feature 6H standard thread tolerance for smooth assembly and perfect matching with high-strength bolts. As vital connecting components for load-bearing joints, these nuts are widely used in outdoor engineering and mechanical assembly.

Material & Mechanical Performance

All products go through professional quenching and tempering processes. They reach Class 8 mechanical grade, with a minimum tensile strength of 800 MPa and Vickers hardness ranging from 180 HV to 302 HV. Thanks to such reliable physical properties, Structural Carbon Steel Heavy Hex Nuts can withstand long-term dynamic loads and vibration without loosening or deformation. We provide multiple surface treatments including black oxide finish and hot-dip galvanization. Hot-dip galvanized units can resist atmospheric corrosion for more than 8 years under regular outdoor conditions. Our mature processing technology keeps product performance consistent all year round.

Dimensional & Application Features

All dimensions comply with ISO 4032 and JB/ZQ 4330-2006, covering common metric sizes from M12 to M30. The thickened hexagon design enhances load-bearing capacity, while flat bearing surfaces distribute pressure evenly. For assembled sets of 8H grade fasteners, the guaranteed load capacity reaches 70 kN. Structural Carbon Steel Heavy Hex Nuts are well suited for steel frame connections, truss installation on road and railway bridges, and assembly of large mining equipment. Every batch undergoes strict sampling inspection before delivery to guarantee quality.

Quality Control & Supply Capacity

We follow unified industrial specifications throughout the whole production process, including raw material inspection, forging, thread machining and finished product testing. Professional testing equipment is used to examine hardness, load resistance and thread accuracy. Supported by well-established production lines and standardized management, we supply standard and custom fasteners to clients across the globe. Stable production and comprehensive testing ensure every batch of Structural Carbon Steel Heavy Hex Nuts fully meets international engineering standards.