S-91247A544 1/4"-20 x 1 1/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength and Grade 5 classification, ensuring reliable performance in high-stress applications.
- Superior corrosion resistance from zinc plating, extending service life in harsh industrial environments.
- Optimized thread engagement with 1/4"-20 UNC coarse threads and Class 2A fit, enabling faster assembly and reduced cross-threading risks.
- Enhanced torque transmission via the external hex drive and 7/16" head width, allowing for secure tightening with standard tools.
- Controlled thread distribution through partial threading, providing improved clamping force and vibration resistance.
- Consistent mechanical properties with Rockwell C25 hardness, maintaining structural integrity under repetitive loads.
- Broad regulatory compliance including ASME B18.2.1, RoHS 3, and REACH, ensuring safety and environmental standards are met.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this Grade 5 hex head screw delivers robust fastening solutions where vibration resistance and structural stability are critical. The zinc plated steel construction combats oxidation in outdoor or humid settings, while the UNC coarse thread design facilitates quick installation in machinery, automotive assemblies, and structural frameworks. Its partial threading concentrates clamping force near the head, preventing joint loosening under dynamic stresses. With 120,000 psi tensile strength and compliance with ASME B18.2.1, it reliably secures heavy-duty components in construction, manufacturing, and equipment maintenance, reducing downtime and replacement costs.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances and UNC coarse thread standards, ensuring precise dimensional accuracy. Manufacturing follows ASME B18.2.1 and SAE J429 specifications for Grade 5 components. The product is verified to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted hazardous substances.
