S-91571A250 1/2"-13 x 1 1/2" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 120,000 PSI tensile strength for reliable performance in heavy-duty structural applications
- Superior hardness and durability with Rockwell C19 rating to resist wear and deformation under high stress conditions
- Optimized thread design featuring 1/2"-13 UNC coarse threads for faster installation and reduced cross-threading risks
- Precision manufacturing with Class 2A thread fit ensuring consistent engagement and reliable fastening performance
- Robust material composition using high-grade steel for excellent strength-to-weight ratio and long-term reliability
- Versatile partial threading with 1" threaded section and 1/2" grip length for controlled clamping force distribution
- Comprehensive compliance meeting multiple industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125
Professional Applications & Engineering Value
This Grade A325 hex head screw delivers critical engineering solutions for structural steel connections where failure is not an option. The high-strength steel construction combined with Rockwell C19 hardness addresses common industrial challenges of joint relaxation and material fatigue under dynamic loads. The 1/2"-13 UNC coarse thread configuration ensures rapid assembly in structural steel applications while maintaining Class 2A thread fit precision for consistent torque transmission. The partially threaded design provides optimal stress distribution across connected materials, making it ideal for structural steel framing, bridge construction, and heavy machinery assembly where vibration resistance and long-term structural integrity are paramount.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 1/2"-13 UNC coarse thread specifications. Complies with ASME B18.2.6 dimensional standards and meets material requirements of ASTM A325 and ASTM F3125 for structural bolts. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
