M16 M18 hexagon heavy bolt and nut washer HDG Geomet Dacromet Oxided Cadmium

M12 M14 hexagon heavy bolt and nut washer white black blue yellow hot dip zinc

Product Description:

Hex Bolts: Applications and Advantages

Hex bolts are widely used across various industries and products due to their simple design, high strength, and ease of installation. Below are some key applications and advantages of hex bolts:

Industries and Products That Use Hex Bolts

1. Construction Industry
- Hex bolts are commonly used in structural steel connections, such as bridges, building frameworks, and scaffolding. Their ability to handle heavy loads and external forces like wind ensures stability and durability in construction projects.

2. Machinery Manufacturing
- In machinery and equipment assembly, hex bolts are essential for fastening mechanical parts in machinery such as lathes, heavy-duty equipment, and assembly lines. Their high strength and durability make them suitable for machines operating under vibration and heavy loads.

3. Automotive and Transportation
- Hex bolts are widely used in the automotive industry for securing critical parts like chassis, engines, and transmission systems. Their strength and reliability help maintain the vehicle's integrity under high-speed and heavy-duty conditions.

4. Home Appliances and Electronics
- Hex bolts are used to assemble and secure parts in appliances such as air conditioners, washing machines, and televisions. They provide reliable connections and ensure the overall stability of the products.

5. Energy and Petrochemical Industry
- Hex bolts are crucial in wind turbines, nuclear power plants, and petrochemical plants, where they are used in securing large equipment and pipeline systems. Their corrosion resistance and strength allow them to perform in harsh environments.

6. Marine and Offshore Engineering
- In shipbuilding and offshore platforms, hex bolts are used to secure deck fittings, hulls, and equipment. Stainless steel hex bolts, in particular, resist corrosion from seawater, ensuring the longevity of marine structures.

7. Furniture Manufacturing
-Hex bolts are frequently used in the assembly of furniture such as beds, tables, chairs, and cabinets. Their easy installation and firm fastening provide stability and long-term durability to household and office furniture.

Applications

Cadmium plating is widely used to protect steel and cast iron from corrosion. Cadmium plating is used to protect the inner metal, and since cadmium is an anode with respect to iron, the ferrous metal underneath it and even the bare substrate when the cadmium is strained or etched out of the cracks are protected by the consumption of cadmium plates. Usually cadmium is applied as a thin layer (less than 25μm or 1mil thick) to resist atmospheric corrosion. Cadmium in the marine atmosphere or seawater contact parts and in the hot water above 70 ℃, cadmium plating is more stable, corrosion resistance, so cadmium plating is often used in the marine environment using the plating.
Cadmium is a silver-white malleable metal. Cadmium metal is easy to forge and rolling. Cadmium's relative atomic mass is 112.41, density is 8.65g/cm3, melting point is 320.9 ℃, boiling point is 767 ℃. Cadmium exists as a divalent metal in compounds. Its hardness is 200 HV.Cadmium's chemical properties are very similar to zinc, but it is insoluble in alkali, soluble in nitric acid and ammonium nitrate, and dissolves very slowly in dilute sulfuric acid and dilute hydrochloric acid. At room temperature and dry air, almost no chemical change, but in the humid air cadmium is easy to oxidise, the formation of oxide film can protect the metal cadmium no longer continue to be corroded.
Cadmium vapour and soluble cadmium salts are toxic and must be strictly prevented from cadmium pollution. The standard potential of cadmium is -0.4 V. In the general industrial atmosphere, cadmium plating on steel parts is cathodic plating, but in the maritime climate, seawater or high temperature environment, cadmium plating on steel parts is anodic plating. When the working temperature exceeds 232 ℃ above, cadmium plating is easy to cause parts brittle.
Cadmium plating is commonly used in aviation, navigation, radio and electronic parts of the protection.
Domestic production of cadmium plating solution used in more types: ammonia carboxyl complex cadmium plating, acid sulfate cadmium plating and cyanide cadmium plating. In addition, there are pyrophosphate cadmium plating, alkaline triethanolamine cadmium plating and HEDP cadmium plating.

Cadmium chemical properties and galvanised layer is similar, in the humid air surface can generate a layer of alkaline carbonate film, has a certain protective effect, can protect the cadmium layer so that it does not continue to be corroded. Cadmium and zinc plating, often on steel, especially high-strength steel parts prone to ‘hydrogen embrittlement’, but cadmium plating than zinc plating tendency to produce hydrogen embrittlement smaller. Therefore, low hydrogen embrittlement cadmium plating is usually used as an important protection method for structural steel, high-strength steel and spring steel parts. However, after plating, it is still necessary to carry out rigorous dehydrogenation treatment, or other more effective anti-hydrogen penetration measures.

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