S-91251A920 1"-8 x 4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight, secure fastening with reduced vibration loosening for enhanced assembly integrity.
- Robust Rockwell C37 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.
- Heavy-duty 3/4" hex drive allows for high-torque installation with standard tools, speeding up assembly processes.
- Coarse UNRC threads enable quick engagement and are ideal for applications requiring rapid disassembly and reassembly.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chain integration.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this black-oxide alloy steel socket head cap screw combines high tensile strength and corrosion resistance to address common challenges like joint failure and environmental degradation. The coarse UNRC thread and Class 3A fit provide secure fastening in heavy machinery, automotive assemblies, and construction equipment, where vibration resistance and quick maintenance are critical. Its partially threaded design allows for precise clamping force distribution, reducing stress concentration. Ideal for applications requiring high-strength fasteners with reliable performance in corrosive or high-load conditions, it ensures long-term operational safety and reduces downtime.
Specification Summary & Compliance
This screw features a 1"-8 UNRC coarse thread with Class 3A thread fit for precise dimensional accuracy, meeting ASTM A574 specifications for alloy steel socket head cap screws. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards in industrial fastener applications.
