S-92327A332 5/8"-11 x 3" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi provides reliable load-bearing capacity for medium-duty industrial applications.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh or outdoor environments.
• High hardness rating (Rockwell C25) ensures excellent wear resistance and reduced thread deformation under stress.
• Coarse UNC threading enables faster installation and better performance in softer materials or where vibration is a concern.
• External square drive design allows for high-torque application with standard tools, minimizing cam-out and improving installation efficiency.
• Full threading along the 3" length offers versatile positioning and secure fastening across the entire shank.
• Standardized Class 2A thread fit ensures consistent compatibility and interchangeability with unified nut and tapped hole components.

Professional Applications & Engineering Value

Engineered for demanding industrial, automotive, and construction environments, this Grade 5 square head screw combines medium strength with robust material properties to address common fastening challenges. The zinc yellow-chromate plated steel construction resists oxidation and chemical exposure, making it ideal for outdoor machinery, structural frames, and assembly lines where moisture or corrosive agents are present. Its coarse 5/8"-11 UNC thread provides superior grip in cast iron, aluminum, or wood substrates, reducing the risk of stripping. The external square drive head design ensures secure tool engagement under high torque, preventing slippage during critical installations. This fastener delivers reliable performance where vibration resistance, durability, and consistent clamping force are essential for operational safety and reduced maintenance intervals.

Specification Summary & Compliance

This square head screw adheres to Unified Standard Class 2A thread tolerances for precise fit and interchangeability. Manufacturing and dimensional specifications conform to ASME B18.2.1 and SAE J429 standards, ensuring consistent quality and performance. The product meets common industry requirements for material composition, mechanical properties, and dimensional accuracy, supporting compliance in regulated industrial and automotive applications.