Bulk 3/4"-10 Grade A Hex Bolts (A307, Coarse Thread, Zinc CR+3)

Durable Fasteners for Construction, Industrial, and Structural Applications

For applications requiring strong, dependable fasteners, trust 3/4"-10 ASTM A307 Grade A Hex Bolts. Manufactured from low carbon steel and zinc-coated with Cr+3 for corrosion resistance, these bolts are a top choice for construction, infrastructure, and general-purpose fastening.

Note – PT = Partial Thread

Key Specifications

• Material: Low carbon steel (ASTM A307 Grade A compliant)
• Tensile Strength: 60,000 psi minimum tensile strength
• Thread Size: 3/4"-10 Coarse Thread (UNC)
• Finish: Zinc CR+3 (trivalent chromate) for enhanced corrosion resistance
• Head Style: Standard hex head for easy wrench tightening
• Compliance: Fully meets ASTM A307 Grade A specifications

Differences Between ASTM A307 Grade A & B

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

• Grade A: Designed for general-purpose applications, including construction, infrastructure, and industrial equipment fastening. These bolts have a minimum tensile strength of 60,000 psi and are widely used for everyday structural needs.
• Grade B: Specifically made for flanged joints in piping systems with cast iron flanges. These bolts have a slightly higher tensile range (60,000 to 100,000 psi) and require heavy hex heads for added strength.
• Why Choose Grade A for 3/4"-10 Hex Bolts? Grade A is ideal for securing structural elements, mounting heavy equipment, and general-purpose fastening. Its broad usability makes it the go-to choice for large-scale construction projects.

Benefits of ASTM A307 Grade A

• Versatile Construction Fastener: Commonly used in commercial buildings, bridges, and heavy equipment manufacturing.
• Reliable Strength: With a minimum tensile strength of 60,000 psi, these bolts provide secure fastening in critical applications.
• Corrosion Resistance: The Zinc CR+3 plating extends bolt lifespan by providing a protective barrier against moisture and oxidation.
• Standard Compatibility: Easily integrates with standard nuts and washers, making replacement and installation simple.

Industries & Applications

• Structural Steel & Construction: Ideal for bolted connections in commercial buildings, bridges, and heavy-duty frameworks.
• Industrial Equipment Manufacturing: Used in assembling and securing large machinery and support structures.
• Infrastructure & Civil Engineering: Essential for securing steel beams, anchoring systems, and structural fastenings.
• General-Purpose Fastening: Perfect for securing wood, concrete, and metal components in industrial settings.

Installation Tips

• Use the Right Wrench: Standard hex head bolts require an appropriately sized wrench or impact socket for installation.
• Torque Properly: Follow recommended torque guidelines to avoid over-tightening or under-tightening, ensuring optimal performance.
• Secure with Matching Hardware: Always use A307-compatible nuts and washers to maintain strength and stability.
• Check for Corrosion Resistance: The zinc-plated finish protects against moisture, but regular inspections ensure long-term durability.

Bulk Purchasing Advantages

• Cost Savings: Buying in bulk lowers the per-unit cost, making large projects more affordable.
• Consistent Quality: All bulk orders are sourced from the same production lot, ensuring uniform strength and reliability.
• Fast Availability: Large stock ensures quick fulfillment, keeping your project on schedule.
• Ideal for Contractors & Manufacturers: Whether you're assembling heavy machinery or working on a large-scale build, having a bulk supply reduces downtime.

Order in Bulk & Save

Upgrade your construction and industrial fastening with bulk 3/4"-10 ASTM A307 Grade A Hex Bolts. Perfect for structural connections, equipment mounting, and general fastening. Order now for bulk discounts, fast shipping, and expert customer service.

✔️ Best for industrial, structural, and heavy machinery projects

✔️ Coarse-thread UNC design for strong and secure fastening

✔️ ASTM A307 Grade A compliant for reliable performance