3/4 5/8 Anodized finishing Metric Imperial Hex Metal Bolt Carbon steel GRADE 12.9 10.9

3/4 5/8 Anodized finishing Metric Imperial Hex Metal Bolt Carbon steel GRADE 12.9 10.9

1,Description:

Hexagonal bolts have the following significant advantages over other fasteners:

1. Superior mechanical properties• High torque transmission efficiency: The hexagonal design provides a large contact surface between the wrench and the bolt head, making it less likely to slip and enabling it to withstand a greater tightening torque
• Strong load-bearing capacity: The head is not prone to deformation or stripped (slippage), making it suitable for high-load connections
• Uniform force distribution: The hexagonal structure ensures a more balanced stress distribution, reducing local fatigue damage

2. Good ease of operation• Strong tool versatility: Standard hex wrenches, socket wrenches, and ratchet wrenches can all be operated, and the tools are readily available
• Multi-directional operation: It can be disassembled and assembled from multiple angles on the side (one every 60°), with good spatial adaptability
• Fast and efficient: When combined with electric/pneumatic tools, it can achieve rapid batch assembly, enhancing production efficiency

3. Standardization and interchangeability• Unified international standards: Adhering to standards such as ISO, DIN, and GB, the specifications are globally universal, and procurement and replacement are convenient
• Complete range of specifications: Parameters such as diameter, length, and pitch are serialized and complete, meeting the requirements of various working conditions

To enhance the rust resistance of steel components, a strong oxidising agent is employed to oxidise the surface into a dense, smooth layer of iron(III) oxide. This thin layer of iron(III) oxide effectively shields the internal structure of the steel from oxidation. When oxidised at high temperatures (approximately 550°C), the resulting iron(III) oxide exhibits a sky-blue hue, hence the term “bluing treatment”. At lower temperatures (approximately 350°C), the formed magnetite appears dark black, hence termed blackening. In armaments manufacturing, bluing is commonly employed; in industrial production, blackening is more frequently utilised.
Operational procedure for black oxide treatment:
Workpiece clamping → Degreasing → Cleaning → Acid pickling → Cleaning → Oxidation → Cleaning → Saponification → Hot water rinsing → Inspection.
(1) Workpiece clamping: Design specialised fixtures or lifting devices according to the workpiece's shape and size. This ensures sufficient spacing between workpieces to prevent contact, allowing each to be fully immersed in the oxidation solution.
(2) Degreasing: This removes surface oils from the workpiece. Following machining (where bluing or blackening is the final process), oil residues inevitably remain on the surface, particularly when rust-preventative oils are used for interim protection. Any oil contamination severely impedes the formation of ferric oxide (Fe₃O₄), necessitating its removal prior to bluing or blackening.

2,Applications:

Machinery Manufacturing: Equipment assembly, base mounting
Construction Engineering: Steel structure connections, bridge construction
Automotive Industry: Engine and chassis assembly
Electronics and Electrical: Enclosures, equipment housings
Furniture Manufacturing: Metal frame structures
Pipe Installation: Flange connections

 

Packaging Options

Available in small packing, carton packing, or pallet configurations to meet your shipping and storage requirements.

Manufacturer Information

Manufactured by JIA SHAN Hardware Company with strict quality control measures and pre-shipment inspection.