S-91247A598 5/16"-18 x 3 3/4" 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
- Superior load-bearing capability with 120,000 psi tensile strength, ideal for high-stress industrial assemblies
- Enhanced corrosion resistance from zinc plating, extending service life in demanding environments
- Reliable thread engagement with UNC coarse threads and Class 2A fit, ensuring consistent fastening performance
- Optimized partial threading (7/8" min thread length) provides secure clamping where full threading isn't required
- Grade 5 strength classification delivers proven durability with Rockwell C25 hardness for repeated use
- External hex drive design allows high-torque installation using standard tools without stripping
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH standards for global applications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 5 hex head screw addresses critical fastening challenges in machinery assembly, structural frameworks, and equipment manufacturing. The zinc plated steel construction provides essential corrosion protection in environments exposed to moisture and chemicals, while the 5/16"-18 UNC coarse thread design ensures rapid installation and vibration resistance. The partially threaded configuration allows precise clamping force distribution, preventing joint loosening in dynamic load conditions. With external hex drive compatibility, maintenance teams can achieve proper torque values using standard tools, reducing installation time and improving workplace safety across manufacturing, construction, and automotive sectors.
Specification Summary & Compliance
This hex head screw maintains Class 2A thread fit tolerances per UNC standards with precise 3 3/4" length and 7/8" minimum thread length. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The fastener is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international environmental and safety regulations for industrial components.
