S-90128A134 1/4"-28 x 1/4" 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.
• Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
• Precise Class 3A fine threads provide a tighter, more secure fit, minimizing loosening under vibration and improving assembly integrity.
• Full threading along the entire length allows for maximum adjustability and uniform load distribution in fastened joints.
• High hardness (Rockwell C37) enhances wear resistance and durability, maintaining thread integrity through repeated use.
• Hex socket drive design enables easy installation and removal with standard tools, reducing assembly time and labor costs.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting stringent industry and regulatory standards.

Professional Applications & Engineering Value

These socket head cap screws are engineered to address critical challenges in demanding industrial settings. The zinc-plated alloy steel construction provides robust protection against corrosion, making them ideal for machinery, automotive, and outdoor equipment exposed to moisture or chemicals. The Class 3A UNF fine threads deliver superior clamping force and vibration resistance, preventing joint failure in dynamic applications. With a fully threaded design and high tensile strength, they ensure consistent performance in assemblies requiring precise alignment and heavy load-bearing capacity. These screws are a reliable choice for engineers seeking durable, high-performance industrial fasteners that enhance operational safety and reduce maintenance needs.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-28 UNF thread with Class 3A fit for high precision and fine thread spacing. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent material and manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards without hazardous substances.