S-90128A361 1/4"-28 x 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi provides reliable load-bearing capacity and resistance to mechanical failure in demanding applications.
• Superior corrosion resistance from the zinc-plated alloy steel construction, extending service life and reducing maintenance needs in harsh environments.
• Precise Class 3A fine thread fit ensures secure, vibration-resistant assemblies with minimal risk of loosening over time.
• High hardness rating (Rockwell C37) offers excellent wear resistance and durability, maintaining thread integrity through repeated use.
• Fully threaded design allows for maximum grip length and uniform stress distribution across the entire fastener.
• Hex socket drive enables high-torque installation and removal in confined spaces without stripping the drive.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality, environmental safety, and regulatory acceptance for global industrial use.

Professional Applications & Engineering Value

This 1/4"-28 UNF Socket Head Cap Screw is engineered to address critical challenges in precision machinery, automotive systems, and heavy-duty equipment assembly. The zinc-plated alloy steel material provides a robust barrier against corrosion, essential for components exposed to moisture or chemicals. The Class 3A fine thread and fully threaded rod design deliver superior clamping force and vibration resistance, preventing joint failure in high-stress environments. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme operational loads without deforming, making it ideal for securing critical parts in aerospace, manufacturing, and construction applications where reliability is non-negotiable.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-28 UNF fine thread with Class 3A fit for high-precision assembly and dimensional accuracy. It is manufactured in accordance with ASTM A574 specifications, ensuring consistent quality and performance. 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 for industrial use worldwide.