Bulk 1-1/4"-7 Grade B Heavy Hex Bolts (A307, Coarse Thread, Plain Finish)

Heavy-Duty Fasteners for Industrial & Structural Applications

For high-strength structural and industrial fastening applications, choose 1-1/4"-7 ASTM A307 Grade B Heavy Hex Bolts. These heavy hex bolts are crafted from low-carbon steel with a plain (uncoated) finish, making them ideal for structural steel connections, bridge construction, and industrial assemblies where coatings are unnecessary.

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: 1-1/4"-7 Coarse Thread (UNC)
• Finish: Plain (Uncoated) for versatile use
• Head Style: Heavy hex head for increased torque capacity
• Compliance: Meets ASTM A307 Grade B specifications

Why Choose a Plain Finish?

Plain finish bolts are ideal for applications where additional coatings are not required or where users prefer to apply their own surface treatments. Benefits include:

• Cost-Effective: No additional coating costs, making them economical for bulk use.
• Versatile Applications: Can be used as-is or with custom finishes like galvanization or painting.
• Ideal for Indoor Use: Suitable for environments where corrosion resistance is not a primary concern.

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 1-1/4"-7 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.
• Plain Finish for Versatility: Suitable for applications where coatings are not necessary or where custom coatings will be applied.

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.

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 heavy hex nuts and washers for maximum stability and security.
• Store in Dry Conditions: Protect bolts from excess moisture before installation to prevent oxidation.

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 1-1/4"-7 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

✔️ ASTM A307 Grade B compliant with plain finish