S-91286A113 1/4"-20 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 resistance through zinc-flake coating that protects against harsh industrial environments
- Optimized torque transmission with external hex drive design for secure installation and removal
- Enhanced thread engagement with UNC coarse threading that resists vibration loosening
- Precision manufacturing to Class 2A thread fit standards ensuring consistent quality and compatibility
- Grade 8 certification guaranteeing mechanical properties meet rigorous industrial standards
- Environmental compliance with RoHS 3 and REACH regulations for safe, sustainable usage
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance advantages in demanding industrial settings where failure is not an option. The zinc-flake coated steel construction provides exceptional corrosion protection in outdoor equipment, machinery, and structural applications exposed to moisture and chemicals. The 1/4"-20 UNC coarse thread configuration ensures rapid assembly and superior vibration resistance compared to fine-thread alternatives. With partial threading along the 1 1/4" length, these fasteners provide maximum clamping force in joint connections while maintaining material strength. The external hex drive design accommodates high torque applications common in construction, automotive, and heavy equipment industries, delivering reliable fastening solutions that withstand extreme operational stresses.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse threading specifications. These hex head screws comply with ASME B18.2.1 and SAE J429 Grade 8 mechanical requirements, ensuring consistent performance across industrial applications. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations for chemical safety, providing assurance for environmentally conscious procurement decisions.
