S-91286A201 3/8"-16 x 1 1/4" 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial environments
- Optimized torque transmission with external hex drive design for secure installation and removal
- Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Maximum thread coverage through full threading for enhanced grip strength across the entire fastener length
- Heavy-duty construction meeting Grade 8 standards with Rockwell C33 hardness for durability
- Regulatory compliance assurance with RoHS 3 and REACH standards for environmental safety
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The zinc-flake coated surface provides exceptional corrosion resistance, making them ideal for outdoor equipment, automotive assemblies, and machinery exposed to harsh conditions. The 3/8"-16 UNC coarse thread configuration ensures rapid installation and reliable holding power in structural steel connections, heavy equipment manufacturing, and construction applications. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity under extreme vibration and dynamic loads, reducing maintenance frequency and preventing costly downtime in critical industrial operations.
Specification Summary & Compliance
This heavy-duty hex head screw features precise Class 2A thread fit with UNC coarse thread spacing (3/8"-16) and full threading along the 1-1/4" length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use across global markets.
