S-90340A112 1/4"-20 x 5/8" Socket Head Screws for Square-Drive Wrenches

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
• Exceptional thread engagement and vibration resistance due to the Class 3A precision thread fit for secure, reliable assemblies.
• High tensile strength of 70,000 psi ensures the fastener can withstand significant loads without failure.
• Durable Rockwell B84 hardness provides excellent wear resistance and maintains thread integrity during installation and use.
• Secure, high-torque installation enabled by the square 1/4" drive and high-profile socket head design.
• Broad compatibility and easy assembly with standard 1/4"-20 UNC coarse threads, suitable for a wide range of industrial applications.
• Full regulatory compliance with RoHS 3 and REACH, ensuring safety and environmental standards are met for global supply chains.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Socket Head Cap Screw is engineered to address critical challenges in industrial assembly, such as joint failure under stress and corrosion in demanding environments. The Class 3A thread fit provides tighter tolerances than standard fits, minimizing loosening from vibration and ensuring consistent clamp load in machinery, automotive, and aerospace components. Its high-strength 70,000 psi tensile rating and Rockwell B84 hardness make it suitable for high-stress applications where durability is paramount. The corrosion-resistant properties of 18-8 stainless steel extend service life in moist or chemical-exposed settings, while the fully threaded UNC coarse design allows for quick installation and robust holding power. This combination of precision, strength, and compliance delivers reliable performance for OEMs and MRO professionals seeking to optimize assembly integrity and reduce maintenance costs.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-20 UNC coarse thread with a Class 3A precision fit, ensuring high dimensional accuracy and reliable thread engagement. The manufacturing adheres to standard inch system specifications for drive size (1/4"), head diameter (7/16"), and length (5/8"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting safe use in industrial and consumer products.