Hex Bolts and Screws

Design and Structure

Hex bolts are characterized by:

1. Hexagonal Head – Provides six gripping points for tools, allowing easy tightening and loosening.
2. Threaded Shaft – Can be fully or partially threaded depending on the application.
3. Shank – The unthreaded portion (if present) provides shear strength and reduces stress concentration.

Types of Hex Bolts

Hex bolts are classified based on various parameters, such as threading, material, and finish.

1. Based on Threading

• Fully Threaded Hex Bolts – The entire shaft is threaded, offering more grip and better engagement with nuts or tapped holes.
• Partially Threaded Hex Bolts – The upper part of the shank is smooth, providing extra strength in shear applications.

2. Based on Material

• Carbon Steel Hex Bolts – Common in construction and automotive industries; available in different grades like 4.6, 8.8, and 10.9.
• Stainless Steel Hex Bolts – Corrosion-resistant and ideal for marine, food processing, and outdoor environments. Grades include 304 and 316 stainless steel.
• Alloy Steel Hex Bolts – Offer high tensile strength and are used in heavy-duty applications.
• Brass and Bronze Hex Bolts – Used in electrical applications due to their conductivity and corrosion resistance.

3. Based on Finish

• Zinc-Plated Hex Bolts – Have a thin layer of zinc for mild corrosion resistance.
• Hot-Dip Galvanized Hex Bolts – Provide superior rust resistance with a thick zinc coating.
• Black Oxide Hex Bolts – Improve aesthetics and offer minimal corrosion protection.

Common Sizes and Dimensions

Hex bolts come in metric and imperial sizes. Standard sizes range from M4 to M100 (metric) and ¼-inch to 2½ inches (imperial). The length varies from 10mm to over 500mm, depending on application requirements.

Grades and Strength Ratings

Hex bolts are available in different grades, determining their mechanical properties such as tensile strength and hardness.

Metric System (ISO 898-1 Standards)

• Grade 4.6 – Low-strength bolts for light-duty applications.
• Grade 8.8 – Medium carbon steel, commonly used in structural applications.
• Grade 10.9 & 12.9 – High-strength bolts used in machinery and automotive industries.

Applications of Hex Bolts

Hex bolts are widely used across industries due to their strength, versatility, and ease of use.

1. Construction – Used in steel structures, bridges, and concrete reinforcement.
2. Automotive Industry – Fastening engine components, chassis, and suspension parts.
3. Machinery and Equipment – Securely holds mechanical parts together.
4. Electrical and Plumbing – Used in panel assemblies, grounding, and pipe fittings.
5. Aerospace and Marine – Corrosion-resistant variants like stainless steel are used in harsh environments.

For More Products Click Here…