S-92620A548 1/4"-20 x 1 3/4" 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 capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
- Precise thread engagement with Class 2A UNC coarse threads ensuring reliable fastening and vibration resistance
- Optimal torque transmission via external hex drive design that prevents tool slippage during installation
- Full-length threading provides consistent grip strength along the entire 1-3/4" length for uniform clamping force
- Enhanced durability from Rockwell C33 hardness that maintains fastener integrity under repeated stress
- Regulatory compliance meeting ASME, SAE, RoHS 3 and REACH standards for global industrial applications
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in heavy machinery, construction equipment, and automotive assemblies where high tensile strength is non-negotiable. The zinc yellow-chromate plating provides superior corrosion resistance that outperforms standard zinc coatings in humid or chemical-exposed environments. With UNC coarse threads and Class 2A fit, these fasteners resist loosening from vibration while enabling quicker installation than fine-thread alternatives. The external hex drive accommodates standard wrenching tools for secure tightening in confined spaces, making them ideal for structural connections requiring 150,000 psi tensile strength and reliable performance under extreme loads.
Specification Summary & Compliance
Manufactured to exact Class 2A thread tolerances with UNC 1/4"-20 coarse threading and full compliance with ASME B18.2.1 and SAE J429 Grade 8 specifications. These hex head screws meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they contain no restricted substances for global industrial use. The fully threaded design maintains consistent mechanical properties along the entire 1-3/4" length, providing reliable performance in demanding applications requiring certified Grade 8 fastener strength.
