S-91236A974 1/2"-13 x 20" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength Steel Hex Head Screws
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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 60,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating protection, extending service life in harsh environments
- Optimized thread engagement with Class 2A UNC coarse threads for faster assembly and reduced cross-threading risk
- High-torque installation capability featuring external hex drive design for secure fastening with standard tools
- Reduced material stress concentration through partial threading design while maintaining full shank strength
- Consistent mechanical properties with Rockwell B69 hardness ensuring dimensional stability under load
- Industry-standard compatibility meeting ASME B18.2.1 specifications for reliable interchangeability
Professional Applications & Engineering Value
This heavy-duty hex head screw delivers critical engineering solutions for structural applications requiring high tensile strength and corrosion resistance. The 1/2"-13 UNC coarse thread configuration ensures rapid installation in steel frameworks, construction equipment, and industrial machinery, while the zinc plating provides essential protection against environmental degradation. The 20" length with partial threading offers optimal stress distribution for applications where full thread engagement isn't required, preventing thread damage in critical connection points. Engineered to withstand 60,000 psi tensile loads, this fastener addresses common failure points in heavy equipment assembly and structural steel connections.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threads (1/2"-13) and right-hand thread direction. Complies with ASME B18.2.1 dimensional standards and ASTM A307 material specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions. The external hex drive (3/4" head width) ensures compatibility with standard industrial tools.
