S-91257A693 7/16"-14 x 7" 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
- Maximum load-bearing capability with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Precision thread engagement with Class 2A fit and UNC coarse threads for faster assembly and reduced cross-threading risks
- Enhanced installation torque control via external hex drive design that prevents tool slippage under high stress
- Optimized strength-to-weight ratio through Grade 8 steel construction and Rockwell C33 hardness
- Reliable partial threading allowing unthreaded shank sections to bear shear loads without thread damage
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws solve critical fastening challenges where vibration resistance and structural integrity are paramount. The 7/16"-14 UNC coarse thread configuration ensures rapid installation in steel frameworks, construction equipment, and machinery assemblies while maintaining Class 2A thread fit precision. The zinc yellow-chromate plating creates a sacrificial barrier against oxidation in outdoor or high-moisture environments, significantly reducing maintenance cycles. With partial threading design, the unthreaded shank section provides superior shear strength for pivot points and structural connections, making these external hex drive fasteners ideal for demanding applications requiring ASME B18.2.1 compliance and consistent performance under extreme loads.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 and SAE J429 standards with Class 2A thread tolerances for consistent fit. Features UNC coarse threads (7/16"-14) with 1 3/8" minimum thread length on a 7" overall fastener. The zinc yellow-chromate finish meets industrial corrosion protection requirements while the Grade 8 classification guarantees mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness verification.
