S-90128A114 4-40 x 7/8" 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 applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc-plated alloy steel construction extends service life in harsh industrial environments.
- Precise Class 3A thread fit guarantees tight, secure fastening with minimal backlash for improved assembly accuracy.
- High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threads enable quick installation and reduced cross-threading risks, speeding up assembly processes.
- Hex socket drive design allows for high torque application and easy access in confined spaces, enhancing installation efficiency.
- Full compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
This Socket Head Cap Screw is engineered to address critical fastening challenges in demanding sectors such as machinery, automotive, and heavy equipment. The zinc-plated alloy steel construction combats corrosion, while the 4-40 UNC coarse threads with Class 3A fit deliver vibration-resistant, secure connections that withstand dynamic loads. Its 170,000 psi tensile strength and Rockwell C37 hardness prevent stripping and deformation under high torque, making it ideal for applications requiring reliable, heavy-duty fastening solutions. The hex drive socket facilitates efficient installation in tight spaces, reducing assembly time and labor costs in industrial maintenance and production lines.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise dimensional accuracy and UNC coarse thread standards. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industrial markets.
