S-90128A201 8-32 x 1 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength (170,000 PSI) ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from zinc plating protects against rust and environmental degradation, extending service life in harsh industrial settings.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening in critical machinery.
• Coarse UNC threading enables faster installation and easier alignment, saving valuable assembly time in production environments.
• Partially threaded design offers optimal grip and clamping force control, preventing over-tightening and material damage.
• Standard hex socket drive (9/64") allows for high-torque application with common tools, ensuring efficient maintenance and disassembly.
• Certified material hardness (Rockwell C37) maintains structural integrity under repeated loads, providing long-term durability for industrial equipment.

Professional Applications & Engineering Value

These zinc-plated alloy steel socket head cap screws deliver critical engineering solutions where vibration resistance and structural integrity are paramount. The 8-32 UNC coarse thread configuration prevents cross-threading during rapid assembly in automotive, aerospace, and heavy machinery applications, while the partially threaded rod design concentrates clamping force precisely where needed. The 170,000 PSI tensile strength and Rockwell C37 hardness ensure these fasteners withstand extreme operational stresses without deformation, making them ideal for high-vibration environments where standard fasteners would fail. The corrosion-resistant zinc plating provides essential protection in humid or chemically aggressive settings, significantly extending maintenance intervals and reducing total cost of ownership for industrial equipment manufacturers.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit standards with UNC coarse thread spacing and right-hand thread direction. These socket head cap screws comply with ASTM A574 manufacturing specifications for high-strength alloy steel fasteners. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring hazardous substance restrictions are met for global industrial applications.