S-90128A642 3/8"-16 x 4 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength (170,000 PSI) ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from zinc-plated alloy steel construction extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal play, enhancing assembly stability.
• Coarse UNC threads enable quicker installation and easier alignment, saving time during assembly and maintenance.
• Partially threaded design provides optimal grip and clamping force where needed, improving joint security.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial standards.

Professional Applications & Engineering Value

These Socket Head Cap Screws are engineered to address critical challenges in heavy-duty machinery, automotive assemblies, and structural frameworks where high tensile strength and corrosion resistance are paramount. The zinc-plated alloy steel construction combats rust and degradation, prolonging lifespan in humid or outdoor settings. With UNC coarse threads and a Class 3A fit, they deliver reliable fastening that resists loosening under vibration, reducing maintenance downtime. The partially threaded rod type allows for precise clamping in bolted joints, making them ideal for applications requiring controlled tension. Designed for industrial fasteners in the inch system, they ensure compatibility with existing equipment while meeting rigorous ASTM A574 specifications for consistent performance.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse threads (3/8"-16 size) per inch system requirements. Manufacturing follows ASTM A574 specifications, ensuring high-quality alloy steel with a tensile strength of 170,000 PSI and Rockwell C37 hardness. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for safe industrial use.