S-90128A563 1/4"-20 x 3 3/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Zinc-plated alloy steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
• Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
• UNC coarse threading allows for quicker installation and reduced cross-threading risks, improving assembly efficiency.
• Partially threaded design with a 1 1/4" minimum thread length provides optimal grip and alignment in varied material thicknesses.
• Hex socket drive enables high torque application and access in confined spaces, enhancing installation versatility.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these socket head cap screws deliver robust performance where reliability is non-negotiable. The zinc-plated alloy steel material combats corrosion, making these fasteners ideal for outdoor machinery, automotive assemblies, and manufacturing equipment exposed to moisture or chemicals. With a Rockwell C37 hardness and 170,000 psi tensile strength, they withstand extreme loads and vibrations, preventing loosening in dynamic applications. The 1/4"-20 UNC coarse thread and Class 3A fit ensure rapid, secure engagement in metals and composites, reducing assembly time while maintaining precision. Commonly used in jigs, fixtures, and heavy-duty frameworks, these screws provide long-term durability and compliance with international standards for seamless integration into global supply chains.

Specification Summary & Compliance

This socket head cap screw adheres to Class 3A thread fit for high precision and UNC coarse threading per inch system standards. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring material and dimensional consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for industrial use worldwide.