S-90117A118 4-40 x 1/2" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws
Alloy Steel Wire-Lockable 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.
- Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance, extending service life in harsh operating conditions.
- Hex socket drive design allows for high torque application and easy installation in confined spaces with standard 3/32" tools.
- Coarse UNC 4-40 threads enable quick assembly and disassembly, improving efficiency in maintenance and production lines.
- Full threading along the 1/2" length ensures consistent clamping force and versatility in various material thicknesses.
- Compliance with ASME B18.3 and environmental standards guarantees quality, safety, and regulatory adherence for global supply chains.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and corrosion in demanding environments. The Class 3A thread fit and coarse 4-40 UNC threads provide secure, repeatable connections in machinery, automotive assemblies, and electronic enclosures, reducing maintenance downtime. The high tensile strength and Rockwell C37 hardness ensure durability under heavy loads, while the hex drive facilitates efficient installation with common tools. Ideal for OEM and MRO applications, this screw delivers reliable performance where precision and corrosion resistance are paramount.
Specification Summary & Compliance
This socket head cap screw features a Class 3A thread fit per UNC standards, ensuring tight tolerances for precise assembly. It meets ASME B18.3 specifications for dimensional accuracy and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable manufacturing practices.
