Overview

The Carbon Steel DIN933 HDG Grade 8.8 Full Thread Hex Bolt with Washer is a robust and corrosion-resistant fastening solution designed for demanding applications. This product combines the strength of Grade 8.8 carbon steel with the excellent protective qualities of hot-dip galvanization (HDG) and a full-thread design, often paired with a washer for enhanced performance.

Key Features

• Material: High-quality carbon steel, offering excellent strength and durability.
• Standard: Conforms to DIN 933, specifying a hexagonal head bolt with a full thread.
• Strength Grade: Grade 8.8, indicating a high-tensile bolt with a minimum tensile strength of 800 MPa and a yield strength of 640 MPa, suitable for high-strength structural connections.
• Thread Type: Full thread, meaning the threading extends along the entire length of the bolt shaft. This design offers maximum gripping surface and is ideal for connections where the material being fastened is relatively thin or where maximum thread engagement is required.
• Coating: Hot-Dip Galvanized (HDG), providing a thick, durable zinc coating that offers superior corrosion resistance against rust, moisture, and various environmental elements, making it ideal for outdoor and harsh industrial applications.
• Included Washer: Typically supplied with a compatible washer (flat or spring washer) to increase the bearing surface, distribute the load more evenly, prevent loosening, and protect the fastened material surface.
• Hexagonal Head: Standard hexagonal head for easy tightening and loosening with common wrenches.

Advantages

• Superior Corrosion Resistance: The HDG coating ensures a significantly longer lifespan in corrosive environments compared to plain or electro-galvanized bolts.
• High Strength: Grade 8.8 carbon steel provides excellent tensile and shear strength, making it suitable for heavy-load applications.
• Optimized Thread Engagement: Full thread design maximizes engagement with the nut or tapped hole, suitable for thin materials or adjustable connections.
• Enhanced Load Distribution: The integrated or supplied washer helps to spread the clamping force over a larger area, reducing stress on the fastened material and preventing damage.
• Reliable Fastening: Offers a strong, durable, and secure connection, reducing the risk of loosening due to vibration or thermal expansion.

Applications

This type of bolt is extensively used in:

• Construction: Steel structures, bridges, guard rails, building frames, concrete anchoring.
• Infrastructure: Road and railway construction, power transmission towers, telecommunication infrastructure.
• Marine and Coastal Environments: Docks, piers, shipbuilding, offshore platforms where salt spray and moisture are prevalent.
• Industrial Machinery: Heavy equipment assembly, agricultural machinery, mining equipment, and general mechanical engineering requiring high strength and weather resistance.
• Outdoor Installations: Fences, gates, street furniture, and signage where exposure to the elements is constant.

Considerations

• Thread Fit: The HDG coating can slightly increase the thread diameter, requiring nuts with slightly oversized tapping or specifically designed galvanized nuts to ensure proper fit (often referred to as overtapped nuts).
• Appearance: Hot-dip galvanization can result in a slightly rougher and less uniform surface finish compared to electro-galvanized or plain bolts.
• Installation: Proper torque specifications should always be followed to ensure the integrity of the connection and prevent damage to the bolt or coating.