S-91571A405 1/2"-13 x 3 3/4" 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 demanding structural applications
- Enhanced durability and wear resistance thanks to Rockwell C19 hardness, ensuring long service life under heavy loads
- Optimized thread engagement with partial threading and 1" thread length for secure fastening while reducing installation time
- Superior torque transmission through the external hex drive and 7/8" head width, preventing stripping during high-torque applications
- Precise dimensional consistency with Class 2A thread fit and UNC coarse threads for easy assembly and consistent clamping force
- Comprehensive regulatory compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 standards for guaranteed quality and safety
- Environmental responsibility through RoHS 3 and REACH compliance, ensuring safe use in regulated industries
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical engineering solutions for heavy-duty applications where structural integrity is paramount. The high-strength steel construction combined with Rockwell C19 hardness provides exceptional resistance to vibration loosening and fatigue failure in construction, bridgework, and structural steel connections. The 1/2"-13 UNC coarse threads offer superior pull-out resistance in various materials, while the partial threading design concentrates strength where needed most. The external hex drive configuration ensures reliable torque application even in confined spaces, making these industrial hex head bolts ideal for critical joints requiring predictable clamp load maintenance under dynamic loading conditions.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse threads and 3 3/4" overall length. These fasteners strictly conform to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures these components meet the latest international standards for restricted substances.
