S-90117A112 2-56 x 1/4" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

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 in critical applications.
• Superior corrosion resistance from the Black-Oxide finish prolongs service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit guarantees tight, secure connections with minimal backlash, enhancing assembly accuracy and vibration resistance.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity and drive engagement through repeated use.
• Compact 5/64" hex drive design allows for easy installation in confined spaces while offering robust torque transmission.
• Fully threaded UNC coarse spacing enables rapid installation and strong holding power across the entire length, improving assembly efficiency.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, supporting global supply chain requirements.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this Black-Oxide Alloy Steel Socket Head Cap Screw combines high tensile strength with corrosion resistance to address common challenges like vibration loosening and environmental degradation. The 2-56 UNC coarse thread and Class 3A fit provide secure fastening in precision assemblies, from machinery and automotive components to electronic enclosures. Its fully threaded design ensures uniform load distribution, while the standard socket head profile with a 5/64" hex drive facilitates easy access in tight spaces. Ideal for applications requiring reliable, high-strength fasteners that meet stringent ASME B18.3 specifications, this screw delivers consistent performance where durability and compliance are critical.

Specification Summary & Compliance

This socket head cap screw features a 2-56 UNC thread with Class 3A fit and coarse spacing, ensuring precise dimensional accuracy per ASME B18.3. Manufactured from alloy steel with a Black-Oxide surface treatment, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, supporting safe and sustainable use in industrial applications.