S-90117A562 1/4"-20 x 1 3/4" 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides consistent engagement and vibration resistance, enhancing assembly integrity and reducing loosening over time.
• Hex socket drive design with 3/16" drive size allows for high-torque installation in confined spaces, improving installation efficiency.
• Partially threaded shank offers optimal clamping force distribution, preventing joint slippage in critical mechanical assemblies.
• Rockwell C37 hardness ensures high durability and wear resistance, maintaining thread integrity through repeated use.
• Compliance with ASME B18.3 and environmental standards guarantees consistent quality and safe use in regulated industries.

Professional Applications & Engineering Value

This 1/4"-20 UNC Socket Head Cap Screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in heavy machinery. The black-oxide alloy steel construction provides a robust barrier against moisture and chemicals, making it ideal for automotive, aerospace, and manufacturing equipment where exposure to harsh conditions is frequent. Its coarse UNC thread and Class 3A fit ensure quick, secure fastening in high-vibration environments, reducing downtime for adjustments. The partially threaded design concentrates clamping force precisely, preventing damage to assembled components. By integrating these features, this fastener delivers reliable performance in industrial assembly applications, supporting long-term operational stability and safety.

Specification Summary & Compliance

This socket head cap screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. Threads are manufactured to Class 3A fit with UNC coarse threading for consistent engagement. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environmentally sensitive applications. Additional details include a tensile strength of 170,000 psi, Rockwell C37 hardness, and right-hand thread orientation, all meeting industrial standards for reliability.