Bulk 3/8"-16 Grade A Hex Bolts (A307, Coarse Thread, Low Carbon, Plain)

Reliable Fasteners for Construction, Industrial, and Structural Applications

For high-strength, secure fastening, trust 3/8"-16 ASTM A307 Grade A Hex Bolts. Manufactured from low carbon steel with a plain (uncoated) finish, these bolts provide durability for infrastructure, heavy-duty structural projects, 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: 3/8"-16 Coarse Thread (UNC)
• Finish: Plain (Uncoated) for welding, custom coatings, or controlled oxidation
• 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 3/8"-16 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

• Reliable Performance: Manufactured with a minimum tensile strength of 60,000 psi, ensuring secure fastening in demanding applications.
• Versatile Construction Fastener: Commonly used in commercial buildings, bridges, and heavy equipment manufacturing.
• Uncoated Finish: The plain steel finish allows for custom coatings, welding applications, or natural oxidation where needed.
• 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.
• Consider Coatings: If used in outdoor or corrosive environments, additional plating or protective coatings may be beneficial.

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 3/8"-16 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