S-91247A611 5/16"-18 x 8" 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 strength for demanding applications with Grade 5 classification and 120,000 psi tensile strength
- Enhanced corrosion resistance provided by zinc plating, extending service life in various environments
- Reliable coarse threading with UNC thread type and Class 2A fit for secure fastening and vibration resistance
- Optimized partial threading design allowing for precise clamp force control in specific assembly scenarios
- Industrial-grade hardness at Rockwell C25 ensuring excellent wear resistance and durability
- Standard-compliant engineering meeting ASME B18.2.1 and SAE J429 specifications for consistent quality
- Environmental compliance assurance with RoHS 3 and REACH regulations for safe industrial use
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional performance in heavy-duty industrial applications where reliability is paramount. The zinc plated steel construction provides essential corrosion protection for machinery, structural frameworks, and equipment exposed to harsh conditions. Featuring 5/16"-18 UNC coarse threading with partial threading design, it offers superior grip strength while preventing overtightening in critical joints. The external hex drive and substantial 8" length make it ideal for construction, manufacturing, and automotive assemblies requiring high clamp loads. Engineered to withstand significant stress with its 120,000 psi tensile strength, this fastener solves vibration-related loosening issues while maintaining structural integrity under dynamic loads.
Specification Summary & Compliance
This hex head screw maintains precise Class 2A thread fit tolerances with 5/16"-18 UNC coarse thread specifications. Manufacturing complies with ASME B18.2.1 and SAE J429 standards ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting current industrial safety requirements for hazardous substance restrictions.
