Bulk 1-1/2"-6 Grade B Heavy Hex Bolts (A307, Coarse Thread, HDG Finish)

Corrosion-Resistant Heavy-Duty Fasteners for Industrial & Structural Applications

For high-strength, corrosion-resistant fastening applications, choose 1-1/2"-6 ASTM A307 Grade B Heavy Hex Bolts. These heavy hex bolts are crafted from low-carbon steel with a hot-dipped galvanized (HDG) finish, offering superior rust resistance and durability for outdoor and high-moisture environments.

Note – PT = Partial Thread

Key Specifications

• Material: Low-carbon steel (ASTM A307 Grade B compliant)
• Tensile Strength: 60,000 - 100,000 psi tensile strength
• Thread Size: 1-1/2"-6 Coarse Thread (UNC)
• Finish: Hot-Dipped Galvanized (HDG) for corrosion resistance
• Head Style: Heavy hex head for increased torque capacity
• Compliance: Meets ASTM A307 Grade B specifications
• RoHS Compliant: HDG finish meets environmental safety standards

Why Choose Hot-Dipped Galvanized (HDG) Finish?

Hot-dipped galvanized (HDG) bolts provide enhanced corrosion resistance by forming a thick, protective zinc coating. Benefits include:

• Superior Rust Protection: Ideal for outdoor, marine, and high-moisture environments.
• Long-Lasting Performance: Zinc coating extends bolt lifespan, reducing maintenance costs.
• Industry-Standard Compliance: Meets ASTM and RoHS requirements for safety and durability.

Differences Between ASTM A307 Grade A & B

Understanding the differences between A307 Grade A and B is essential for selecting the right bolt for your application:

• Grade A: General-purpose fasteners for construction and industrial applications with a minimum tensile strength of 60,000 psi.
• Grade B: Specifically designed for flanged joints in piping systems with cast iron flanges, with a tensile strength of 60,000 - 100,000 psi.
• Why Choose Grade B for 1-1/2"-6 Heavy Hex Bolts? The heavy hex head design ensures a stronger and more secure hold, making it the preferred choice for high-load structural applications and piping installations.

Benefits of ASTM A307 Grade B Heavy Hex Bolts

• Increased Strength: Higher tensile range (up to 100,000 psi) for secure fastening in demanding applications.
• Reliable Flange Joint Fastener: Engineered for structural steel, bridge construction, and industrial piping.
• Heavy Hex Head: Larger head provides greater bearing surface and higher torque capability.
• Corrosion-Resistant HDG Finish: Protects against rust and harsh environmental conditions.

Industries & Applications

• Structural Steel & Construction: Ideal for bolted connections in commercial buildings and heavy-duty frameworks.
• Piping & Flange Joints: Designed for securing cast iron flanges in industrial pipeline systems.
• Utility & Infrastructure: Used in power plants, water treatment facilities, and outdoor industrial installations.
• Heavy Equipment Assembly: Ensures a secure fit in machinery and transportation structures.
• Marine & Outdoor Use: Resistant to saltwater and extreme weather conditions.

Installation Tips

• Use the Right Tools: Heavy hex head bolts require a larger wrench size for proper torque application.
• Torque Properly: Follow ASTM guidelines to achieve correct tightness without overloading the bolt.
• Pair with Compatible Hardware: Use with hot-dipped galvanized heavy hex nuts and washers for maximum stability and security.
• Store in Dry Conditions: Protect bolts from excess moisture before installation to prevent white rust formation.

Bulk Purchasing Advantages

• Cost Savings: Bulk purchases reduce per-unit cost, making large projects more economical.
• Consistent Product Quality: All bulk orders come from the same production lot to ensure uniformity.
• Reliable Supply: Maintain project timelines with readily available stock.
• Designed for Professionals: Perfect for contractors, manufacturers, and industrial suppliers handling large-scale construction and infrastructure projects.

Order in Bulk & Save

Ensure your project is built to last with bulk 1-1/2"-6 ASTM A307 Grade B Heavy Hex Bolts. Engineered for structural steel connections, flange joints, and high-load industrial applications. Order now for bulk discounts, fast shipping, and top-rated customer support.

✔️ Best for structural, piping, and industrial projects

✔️ Heavy hex head design for high-load applications

✔️ Hot-dipped galvanized finish for superior corrosion resistance