S-91286A302 7/16"-20 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 150,000 psi tensile strength, ideal for high-stress structural connections
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A fit and UNF fine thread profile ensuring vibration-resistant fastening
- Optimized torque transmission through external hex drive and 5/8" head width for secure installation
- Reduced cross-threading risk with partially threaded design facilitating easier alignment in deep applications
- Guarded against material fatigue with Rockwell C33 hardness maintaining integrity under repeated stress
- Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality-critical applications
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this Grade 8 hex head screw delivers reliable performance in heavy machinery, structural steel assemblies, and high-vibration equipment. The zinc-flake coated steel construction provides superior corrosion protection compared to standard platings, addressing premature fastener failure in exposed environments. Its 7/16"-20 UNF fine thread with Class 2A fit ensures precise engagement in tapped holes, while the partially threaded design prevents binding in thick materials. The external hex drive and substantial head width enable high torque application without stripping, making it ideal for critical connections requiring 150,000 psi tensile strength and consistent clamping force.
Specification Summary & Compliance
This 2 1/2" length hex head screw features precise Class 2A thread fit with 7/16"-20 UNF fine thread and right-hand direction. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring dimensional accuracy and mechanical properties. The fastener is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for industrial components.
