S-91251A190 8-32 x 1/4" 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 in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight, secure connections with minimal play, enhancing assembly accuracy and vibration resistance.
- Fully threaded design allows for consistent clamping force along the entire length, improving load distribution in critical joints.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated installations.
- Hex socket drive enables easy installation in confined spaces with standard tools, speeding up assembly processes.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chain integration.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. The 8-32 UNC coarse thread design provides rapid assembly and strong holding power in materials like aluminum and soft metals, while the Class 3A fit guarantees precise engagement for critical machinery, automotive, and aerospace components. The combination of 170,000 psi tensile strength and corrosion-resistant coating makes it ideal for high-stress applications where reliability and longevity are paramount, reducing downtime and replacement costs in demanding operational environments.
Specification Summary & Compliance
This fastener meets Class 3A thread fit tolerances per UNC standards, ensuring dimensional accuracy for secure fastening. Manufactured in compliance with ASTM A574 specifications for alloy steel socket head cap screws, it guarantees consistent mechanical properties. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, adhering to environmental regulations for hazardous substance restrictions. Additional features include right-hand coarse threads, a 9/64" hex drive, and full threading along the 1/4" length for uniform performance.
