S-90128A317 1/4"-20 x 7/16" ASME B18.3, 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.
• Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
• Precision Class 3A thread fit guarantees tight, secure fastening with minimal backlash, enhancing assembly accuracy.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, improving efficiency.
• Coarse UNC threads provide quick assembly and strong holding power, ideal for repetitive or vibration-prone setups.
• Full threading along the 7/16" length offers versatile grip depth and consistent clamping force across various materials.
• Compliance with ASME B18.3 and ASTM A574 ensures consistent quality and interoperability with standard components, simplifying procurement.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 1/4-20 UNC Socket Head Cap Screws deliver robust performance where reliability is critical. The zinc-plated alloy steel construction combats corrosion, making them suitable for outdoor equipment, automotive assemblies, and machinery exposed to moisture. With a Rockwell C37 hardness and 170,000 psi tensile strength, they withstand heavy loads and vibrations without stripping or shearing. The hex drive and standard socket head profile enable secure tool engagement, reducing installation time and minimizing damage to the fastener. Ideal for precision engineering, these screws ensure long-term durability in heavy-duty applications, from manufacturing jigs to structural frameworks, while meeting strict industry standards for safety and performance.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for precise dimensional accuracy under UNC coarse threading standards. It conforms to ASME B18.3 specifications and is manufactured in accordance with ASTM A574 for consistent quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it ensures environmental safety and regulatory acceptance in global markets.