S-90128A589 5/16"-18 x 1 3/4" 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 applications.
• Superior corrosion resistance from zinc plating protects against rust and environmental degradation, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance, minimizing loosening in dynamic applications.
• High hardness rating (Rockwell C37) offers excellent wear resistance and durability, maintaining thread integrity through repeated installation cycles.
• Standard hex drive compatibility with 1/4" drive size allows for easy installation using common tools, reducing assembly time and labor costs.
• Partially threaded design enables optimal clamping force distribution, preventing joint separation in precision mechanical assemblies.
• Comprehensive compliance with ASTM A574, RoHS 3, and REACH standards ensures material quality and environmental safety for global industrial use.

Professional Applications & Engineering Value

These zinc-plated alloy steel socket head cap screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The 5/16"-18 UNC coarse thread configuration combined with Class 3A thread fit provides superior vibration resistance in heavy machinery, automotive assemblies, and industrial equipment. The partially threaded design allows for precise clamping force control while the standard hex drive ensures compatibility with existing tooling systems. Engineered to withstand extreme mechanical stresses, these socket head cap screws prevent joint failure in high-vibration environments, making them ideal for critical applications requiring reliable fastening performance and long-term durability.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread specifications. These socket head cap screws comply with ASTM A574 manufacturing standards for socket head cap screws and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The zinc-plated alloy steel construction maintains dimensional stability across the specified 1 3/4" length with 1 1/8" minimum thread length ensuring consistent performance in industrial applications.