S-91247A739 1/2"-13 x 7 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength, ideal for heavy-duty structural and machinery applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Reliable fastening performance with Grade 5 steel construction and Rockwell C25 hardness for consistent durability
- Optimized thread engagement featuring UNC coarse threads and Class 2A fit for quick assembly and vibration resistance
- Secure installation and removal with external hex drive and 3/4" head width for high-torque applications
- Versatile partial threading design allowing precise clamping force distribution across connected materials
- Full regulatory compliance meeting ASME B18.2.1 standards while being RoHS 3 and REACH compliant for global applications
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical engineering solutions for industrial assembly challenges where vibration resistance and structural integrity are paramount. The 1/2"-13 UNC coarse thread configuration ensures rapid installation in steel frameworks, construction equipment, and heavy machinery while maintaining Class 2A thread fit precision. The zinc plated finish provides essential corrosion protection in manufacturing facilities and outdoor applications, significantly reducing maintenance frequency. With partial threading optimizing clamp load distribution, this external hex drive fastener withstands extreme dynamic loads in automotive, infrastructure, and industrial machinery applications where 120,000 psi tensile strength prevents joint failure under stress.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 specifications with Class 2A thread fit tolerances ensuring precise engagement. The UNC coarse thread (1/2"-13) maintains consistent performance across industrial applications while the 7 1/2" length with 1 1/2" minimum thread length provides versatile fastening solutions. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety standards are met for global supply chain requirements.
