S-90128A109 4-48 x 3/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in critical assemblies.
• Class 3A fine thread fit provides superior thread engagement and vibration resistance, maintaining clamp load integrity in dynamic or high-vibration environments.
• Zinc-plated alloy steel construction offers excellent corrosion resistance, extending service life and reducing maintenance needs in harsh industrial settings.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency and tool accessibility.
• Rockwell C37 hardness rating ensures high durability and wear resistance, preventing thread stripping and head deformation during repeated use.
• Full thread coverage along the 3/8" length enables maximum adjustability and secure fastening across the entire engagement area.
• Compliance with ASTM A574 guarantees consistent quality and dimensional accuracy, ensuring reliable interchangeability and performance in precision applications.

Professional Applications & Engineering Value

These 4-48 UNF Class 3A socket head cap screws deliver critical engineering solutions where space constraints and high strength requirements intersect. The fine thread configuration provides enhanced resistance to loosening under vibration, making them ideal for precision equipment, automotive assemblies, and machinery subjected to dynamic loads. The zinc-plated alloy steel material withstands corrosive environments while maintaining the 170,000 psi tensile strength necessary for structural applications. The hex socket drive enables high torque transmission without slippage, crucial for maintaining proper clamp force in industrial fastening systems. Engineered to ASTM A574 specifications, these screws ensure dimensional consistency and reliable performance in OEM manufacturing and maintenance applications requiring precision inch-system fasteners.

Specification Summary & Compliance

This socket head cap screw features 4-48 UNF fine threads with Class 3A fit for precise engagement and manufactured to ASTM A574 standards. The inch-system dimensional specifications include 3/8" length, 3/32" hex drive, and standard socket head profile. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in various industrial applications.