| Item | Specification Details |
|---|---|
| Product Name | Half Thread Hex Head Bolt / HDG Hex Bolt |
| Material | High Strength Carbon Steel (Grade 8.8 / 10.9 / 12.9 Optional) |
| Surface Finish | Hot Dip Galvanized (HDG), thick zinc coating for heavy anti-corrosion |
| Standard Sizes | M10, M12, M16, M20, M24, M30; Custom long overall lengths available |
| Component Structure | Standard hexagon head + smooth unthreaded shank + partial precision rolling thread |
| Applicable Base | Steel structure construction, power transmission tower, bridge engineering, photovoltaic support, coastal municipal facilities, highway guardrails |
| Core Features | Thick hot-dip galvanized layer with superior salt spray & rust resistance; half-thread design fits thick multi-layer steel plate assembly; standard hex head matches torque wrench for precise tightening; high tensile yield strength for heavy load engineering |
| Application Scenarios | High-rise steel frame installation, power tower assembly, bridge structural connection, outdoor solar PV bracket fixing, coastal infrastructure construction, road safety barrier engineering |
| Custom Service | OEM & ODM, customized total length, adjustable bolt strength grade, customizable zinc coating thickness, laser marking on hex head |
Half Thread Hot Dip Galvanized Hex Head Bolt
This half-thread hex bolt is a heavy-duty anti-corrosion fastener specially designed for outdoor, coastal and long-term exposed infrastructure projects.
Manufactured from high-strength medium carbon steel, the bolt undergoes hot-dip galvanizing post-processing. The dense thick zinc layer fully covers the bolt surface, isolating the base metal from rain, air and salt fog, delivering far longer service life than conventional electroplated bolts in harsh corrosive environments. Its half-thread structure features a long smooth unthreaded shank that penetrates thick stacked steel plates, while the precision partial thread pairs with heavy-duty hex nuts to form stable, high-pressure clamping joints.
The regular six-sided hex head works seamlessly with socket wrenches and torque spanners, enabling standardized torque control during construction. Strength grade markings are stamped onto the head surface for quick load capacity identification, complying with various engineering load design standards.
It is widely adopted in national infrastructure projects including steel structures, power transmission towers, bridges and photovoltaic power stations. All finished bolts pass strict tensile strength, hardness and zinc coating thickness tests before shipment, fully conforming to domestic and international steel structure fastening specifications. Custom overall lengths and special strength grades can be manufactured to fulfill large-scale engineering bulk orders.
