S-90128A638 3/8"-16 x 4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI provides superior resistance to breaking under high-stress loads, ensuring reliable performance in demanding applications.
• Class 3A thread fit offers tighter tolerances for a more precise, secure fit, reducing the risk of loosening in high-vibration environments.
• Zinc-plated alloy steel construction delivers excellent corrosion resistance, extending the screw's service life in various industrial conditions.
• Partially threaded design with a minimum 1-1/2" thread length allows for optimal clamping force and easier alignment in assembly operations.
• Rockwell C37 hardness ensures high durability and wear resistance, maintaining thread integrity through repeated use.
• 5/16" hex drive socket head enables easy installation and removal with standard tools, improving assembly efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees that the fastener meets rigorous industry and environmental standards for safe, reliable use.

Professional Applications & Engineering Value

This 3/8"-16 UNC Socket Head Cap Screw is engineered for high-performance industrial applications where strength and reliability are critical. The zinc-plated alloy steel material provides robust corrosion protection, making it ideal for machinery, automotive assemblies, and construction equipment exposed to harsh environments. The coarse UNC thread and Class 3A thread fit ensure quick assembly and a secure, vibration-resistant connection, reducing maintenance needs. With a partially threaded design, it offers precise clamping in fastened joints, preventing joint failure. These features make it a top choice for engineers seeking durable industrial fasteners that maintain integrity under high tensile and dynamic loads.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC coarse thread with a Class 3A thread fit for high precision, a minimum thread length of 1-1/2", and a length of 4". It is manufactured in compliance with ASTM A574 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for restricted substances.