S-91286A224 3/8"-16 x 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 capability with 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc-flake coating that withstands harsh industrial environments
- Enhanced installation efficiency with external hex drive design for high-torque applications
- Reliable thread engagement through Class 2A thread fit ensuring consistent fastening performance
- Optimized weight distribution with partial threading design for balanced strength-to-weight ratio
- Exceptional durability backed by Rockwell C33 hardness for long-term service life
- Industry-standard compatibility with UNC coarse threads for versatile application across equipment
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws provide critical solutions for construction, machinery assembly, and structural frameworks where failure is not an option. The 3/8"-16 UNC coarse thread configuration delivers superior pull-out resistance in metal-to-metal connections, while the zinc-flake coated finish ensures long-term performance in corrosive environments. The partially threaded design concentrates strength where needed most, preventing stress concentration at the thread run-out. These high-tensile fasteners are specifically designed to withstand extreme vibration and dynamic loading conditions common in industrial machinery, transportation equipment, and structural steel applications.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 and SAE J429 standards with Class 2A thread fit tolerance for precision installation. The UNC coarse thread (3/8"-16) ensures reliable performance in high-vibration environments. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making these fasteners suitable for global industrial applications requiring stringent chemical substance controls.
