S-90128A158 3/8"-24 x 1 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 in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tight, secure connections with minimal backlash, ideal for vibration-prone assemblies.
• Fine UNF threads offer improved load distribution and better resistance to loosening under dynamic loads compared to coarse threads.
• Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
• Rockwell C37 hardness ensures excellent wear resistance and durability, maintaining thread integrity over repeated use.
• Partial threading enables optimal clamping force control, preventing over-tightening and material damage.

Professional Applications & Engineering Value

These 3/8"-24 UNF socket head cap screws are engineered to address critical challenges in demanding industrial applications where precision, strength, and corrosion resistance are paramount. The zinc-plated alloy steel construction provides essential protection against rust and chemical exposure in manufacturing equipment, automotive assemblies, and heavy machinery. The fine thread configuration and Class 3A fit ensure vibration resistance and reliable performance in dynamic loading conditions, while the hex drive socket head design facilitates installation in tight spaces where wrench clearance is limited. These partially threaded fasteners are particularly valuable in applications requiring precise clamp load distribution, such as precision machinery, hydraulic systems, and structural frameworks where joint integrity cannot be compromised.

Specification Summary & Compliance

This socket head cap screw features 3/8"-24 UNF fine threads with Class 3A fit for precision threading applications. Manufactured to ASTM A574 specifications, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for hazardous substance restrictions. With a minimum thread length of 1 1/4" and overall length of 1 3/8", it maintains dimensional accuracy per inch system requirements.