S-90128A149 3/8"-16 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 from zinc plating extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit provides secure, vibration-resistant connections for improved assembly reliability.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Hex socket drive design allows for high torque application and easy installation in confined spaces.
• Coarse UNC threads enable quick assembly and disassembly, saving valuable time in maintenance operations.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chain integration.

Professional Applications & Engineering Value

These zinc-plated alloy steel socket head cap screws deliver critical performance advantages in demanding applications where corrosion resistance and high tensile strength are paramount. The UNC coarse thread configuration combined with Class 3A thread fit provides superior engagement in machinery, automotive assemblies, and structural frameworks, preventing loosening under vibration while accommodating thermal expansion. The hex drive socket design enables high torque transmission without cam-out, making these fasteners ideal for heavy-duty applications requiring precise clamping force. The partially threaded design offers optimal grip length control, while the zinc plating creates a protective barrier against environmental degradation, extending service life in outdoor or chemically exposed environments.

Specification Summary & Compliance

This socket head cap screw features precise 3/8"-16 UNC coarse threads with Class 3A thread fit for superior engagement. Manufacturing complies with ASTM A574 specification for high-strength alloy steel fasteners. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) compliance for chemical safety. Thread diameter maintains 0.375" with minimum thread length of 1-1/4" and overall length of 1-3/8".