S-91286A101 1/4"-20 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 demanding industrial applications
- Superior corrosion protection through zinc-flake coating that withstands harsh environmental conditions
- Reliable fastening performance with fully threaded UNC coarse pattern for quick assembly and vibration resistance
- Enhanced durability from Rockwell C33 hardness that maintains structural integrity under stress
- Precise thread engagement with Class 2A fit ensuring consistent torque and secure connections
- Optimized drive efficiency through external hex design for high-torque applications
- Industry compliance assurance meeting critical standards for quality and environmental safety
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in heavy machinery, construction equipment, and automotive assemblies where high tensile strength and corrosion resistance are critical. The zinc-flake coated steel construction provides superior protection against rust and chemical exposure, extending service life in demanding environments. The UNC coarse thread pattern ensures rapid installation and maintains grip strength even under vibration, while the external hex drive accommodates high torque applications without stripping. Engineered to prevent joint failure, these fully threaded fasteners distribute stress evenly across the entire engagement length, making them ideal for structural connections requiring maximum reliability.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC 1/4"-20 coarse threading and right-hand orientation. Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use across regulated industries.
