S-91251A232 4-40 x 5/32" 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.
- Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic applications.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long service life.
- Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
- Fully threaded right-hand coarse UNC thread enables quick assembly and strong holding power in a variety of materials.
- Consistent Rockwell C37 hardness maintains dimensional stability and wear resistance, ensuring repeatable performance.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
This 4-40 UNC Socket Head Cap Screw is engineered to address critical challenges in precision assembly and heavy-duty applications. The black-oxide alloy steel construction provides excellent resistance to corrosion and wear, making it ideal for environments exposed to moisture or chemicals. Its fully threaded design with Class 3A fit ensures tight tolerances and secure fastening, reducing the need for frequent maintenance in machinery, automotive components, and electronic enclosures. The coarse thread facilitates quick installation and robust performance in softer materials, while the hex drive allows for efficient torque transmission without stripping. These features collectively enhance reliability and reduce downtime in industrial settings.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for high precision, with UNC coarse threads and right-hand direction. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring material integrity and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for industrial use.
