S-91286A122 1/4"-20 x 2 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc-flake coating that withstands harsh industrial environments
- Enhanced durability with Rockwell C33 hardness to resist wear and deformation under stress
- Reliable thread engagement with Class 2A fit and coarse UNC threading for secure fastening
- Optimized partial threading design providing both gripping strength and clearance where needed
- Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications
- External hex drive design for high-torque installation with standard tools
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional performance in demanding industrial applications where failure is not an option. The zinc-flake coated steel construction provides superior corrosion resistance compared to conventional platings, making these 1/4"-20 UNC screws ideal for outdoor equipment, heavy machinery, and structural assemblies exposed to environmental challenges. The partially threaded design ensures maximum clamping force where needed while allowing clearance in non-critical sections. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity under extreme vibration and dynamic loads, solving common failure points in construction, automotive, and manufacturing applications where standard fasteners would compromise system reliability.
Specification Summary & Compliance
This 2 1/4" length hex head screw features precise Class 2A thread fit with 1/4"-20 UNC coarse threading and right-hand 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, making them suitable for global industrial applications with strict material restrictions.
