S-91251A257 10-24 x 3 3/4" 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 for reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish, extending service life in demanding industrial environments.
- Precise Class 3A thread fit ensures tight, secure connections with minimal play, enhancing assembly integrity.
- High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading allows for quicker installation and reduced cross-threading risks, improving efficiency.
- Hex socket drive design offers high torque capability and easy access in confined spaces, streamlining maintenance.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration-induced loosening and environmental degradation. The UNC coarse thread and Class 3A fit provide a secure, vibration-resistant connection in machinery, automotive assemblies, and heavy equipment, where reliability is critical. The partially threaded design allows for precise clamping without unnecessary thread engagement, reducing stress concentrations. With a high tensile strength and corrosion-resistant coating, it excels in applications requiring durability under dynamic loads and exposure to oils or moisture, ensuring long-term operational safety and reduced maintenance costs.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. It meets ASTM A574 specifications for high-strength alloy steel and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material consistency for industrial use.
