S-91571A402 1/2"-13 x 2 3/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength ensures reliable performance in heavy-duty structural connections
• Superior hardness and durability with Rockwell C19 rating provides excellent resistance to wear and deformation under stress
• Optimized thread design featuring 1/2"-13 UNC coarse threading offers faster installation and superior grip in various materials
• Precision thread fit with Class 2A tolerance guarantees consistent engagement and reduces the risk of cross-threading
• Robust hex head design with 7/8" width and external drive allows for high-torque application using standard tools
• Partial threading configuration with 1" thread length and 1 3/4" grip length provides optimal clamping force distribution
• Comprehensive compliance with major industry standards ensures interoperability and reliability in critical applications

Professional Applications & Engineering Value

These Grade A325 hex head screws deliver exceptional engineering value in structural steel connections, heavy machinery assembly, and construction applications where high tensile strength and reliability are paramount. The steel construction combined with Rockwell C19 hardness ensures these heavy-duty hex screws maintain integrity under extreme loads and vibration. The 1/2"-13 UNC coarse threading provides superior resistance to loosening while enabling quicker installation in structural steel and other demanding materials. The partially threaded design concentrates clamping force precisely where needed, preventing joint slippage in critical connections. These industrial hex screws are engineered to solve common challenges in structural bolting, including maintaining preload, resisting dynamic loads, and ensuring long-term joint integrity in harsh environments.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances for consistent performance, these hex head screws comply with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting. The inch system fasteners feature precise dimensional control with 2 3/4" length, 1/2"-13 UNC coarse threads, and right-hand thread direction. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, ensuring these components meet the latest regulatory standards for industrial use.