S-91247A597 5/16"-18 x 3 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 industrial and construction applications
- Superior corrosion resistance provided by zinc plating, extending service life in harsh environments
- Reliable fastening performance with Class 2A thread fit ensuring consistent engagement and vibration resistance
- Optimized for high-torque installation thanks to the external hex drive design and Rockwell C25 hardness
- Versatile partial threading allows for precise clamping force control in varied material thicknesses
- Industry-standard compliance with ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
- Environmental regulation adherence through RoHS 3 and REACH compliance, ensuring safe usage in regulated markets
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical engineering solutions where structural integrity is non-negotiable. The coarse UNC threading and partial threading design prevent loosening under dynamic loads, making it ideal for machinery assembly, structural steel connections, and heavy equipment manufacturing. The zinc-plated finish actively combats oxidation in humid or outdoor settings, while the external hex drive facilitates high-torque installation with standard tools. Engineered to ASME B18.2.1 standards, this fastener ensures predictable performance in industrial and construction applications where failure is not an option.
Specification Summary & Compliance
This hex head screw maintains Class 2A thread fit tolerances per UNC standards, with precise 5/16"-18 coarse threading and a 3 1/2" length. Manufacturing adheres to ASME B18.2.1 and SAE J429 Grade 5 requirements, guaranteeing mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety regulations.
