S-91257A681 7/16"-14 x 3" 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 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
- Enhanced installation efficiency with external hex drive design providing secure tool engagement and torque transmission
- Reliable thread engagement with Class 2A thread fit ensuring consistent fastening performance in coarse UNC threading
- Optimized strength-to-weight ratio through partial threading design that concentrates material where needed most
- Extended service life with Rockwell C33 hardness maintaining structural integrity under repeated stress
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these Grade 8 hex head screws deliver exceptional performance in heavy machinery, structural steel connections, and high-vibration equipment. The 7/16"-14 UNC coarse threading provides superior resistance to loosening while the zinc yellow-chromate finish creates a robust barrier against corrosion in outdoor or chemically aggressive settings. The partially threaded design concentrates the 150,000 psi tensile strength precisely where shear forces are greatest, making these external hex drive fasteners ideal for critical joints in construction, automotive, and manufacturing applications where failure is not an option.
Specification Summary & Compliance
This 3" length hex head screw features precise Class 2A thread fit tolerances with 7/16"-14 UNC coarse threading and right-hand thread direction. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, providing assurance for international industrial applications and supply chain requirements.
