S-91286A134 1/4"-28 x 1/2" 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 resistance through zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Maximum thread coverage through full threading along the entire 1/2" length for enhanced grip strength
- Optimized drive efficiency with external hex head design allowing high torque application and easy installation
- Consistent hardness performance at Rockwell C33 maintaining structural integrity under repeated stress
- Regulatory compliance assurance meeting industry standards including RoHS 3 and REACH for global applications
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc-flake coated steel construction provides exceptional protection against environmental degradation, while the 1/4"-28 UNF fine threads with Class 2A fit ensure precise alignment and secure fastening in vibration-prone applications. The external hex drive design facilitates efficient installation in confined spaces common in industrial machinery, automotive assemblies, and heavy equipment. With fully threaded construction along the entire 1/2" length, these fasteners distribute clamping force evenly, preventing joint failure in critical structural applications where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 and SAE J429 specifications, these Grade 8 hex head screws feature precision UNF fine threads with Class 2A tolerance for consistent fit and performance. The fasteners maintain dimensional accuracy with 1/4"-28 thread size and 1/2" length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and global market acceptance for industrial applications requiring certified components.
