S-91286A146 1/4"-28 x 2" 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 that withstands harsh industrial environments
- Precise thread engagement with Class 2A fit and UNF fine threads ensuring vibration-resistant connections
- Optimized drive efficiency featuring external hex design for high-torque installation with standard tools
- Enhanced durability from Rockwell C33 hardness providing excellent wear resistance
- Controlled thread distribution through partial threading for focused clamping force where needed
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional performance in heavy machinery, structural assemblies, and equipment manufacturing. The zinc-flake coated surface treatment provides superior corrosion resistance compared to conventional platings, significantly extending service life in challenging environments. The 1/4"-28 UNF fine thread configuration offers enhanced vibration resistance and precise tension control, while the partially threaded design concentrates clamping force exactly where needed. With external hex drive compatibility, these fasteners accommodate high-torque installation using standard industrial tools, making them ideal for maintenance, repair, and OEM applications requiring reliable, high-strength connections.
Specification Summary & Compliance
This 2" hex head screw features precise Class 2A thread fit tolerances with 1/4"-28 UNF fine threads and 3/4" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, it delivers 150,000 psi tensile strength and Rockwell C33 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
