S-97972A523 1/2"-13 x 3 1/2" Extreme-Strength Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance thanks to the black-oxide steel coating, extending service life in harsh industrial environments.
• Superior load distribution and stability from the integrated flange, reducing the risk of surface damage and loosening under vibration.
• High tensile strength of 180,000 psi ensures reliable performance in heavy-duty applications, resisting shear and tensile forces.
• Precision installation and fit with Class 2A thread fit, providing consistent engagement and reducing cross-threading risks.
• Robust Rockwell C38 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.
• Quick and easy fastening with UNC coarse threads and external hex drive, ideal for efficient assembly in time-sensitive projects.
• Versatile partial threading allows for unthreaded shank sections, providing enhanced clamping force in specific joint designs.

Professional Applications & Engineering Value

This Black-Oxide Steel Hex Head Screw is engineered to address common industrial challenges such as joint failure and corrosion. The UNC coarse thread design ensures rapid installation in structural steel, machinery, and construction applications, minimizing assembly time while the flanged head distributes clamping force evenly, preventing surface indentation and improving load-bearing capacity. Made from high-strength steel with a Rockwell C38 hardness, it withstands high-stress environments, making it ideal for heavy equipment, automotive frames, and infrastructure projects where durability and reliability are critical. The black-oxide finish provides an added layer of corrosion resistance, extending the fastener's lifespan in outdoor or humid conditions without compromising on tensile strength.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 2A thread fit for precise dimensional accuracy, ensuring compatibility with standard nuts and tapped holes. Manufactured to meet industry specifications for inch-system fasteners, it features a 1/2"-13 thread size, 3 1/2" length, and partial threading. The product complies with common industrial requirements for material properties, including 180,000 psi tensile strength, and is suitable for applications demanding consistent performance under ASME and related engineering guidelines.