S-92327A821 1/2"-13 x 1" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc yellow-chromate plating, extending service life in harsh industrial environments
• High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration
• Rockwell C25 hardness provides excellent wear resistance and prevents thread deformation during installation
• External square drive design allows for secure tool engagement and higher torque application without slippage
• Coarse UNC threads enable faster installation and better performance in softer materials
• Unified Standard Class 3A thread fit guarantees precise engagement and consistent clamping force
• Full threading along the 1" length offers maximum adjustment flexibility and uniform stress distribution

Professional Applications & Engineering Value

This SAE Grade 5 square head screw delivers exceptional engineering value for demanding industrial applications where reliability is critical. The combination of medium carbon steel construction and zinc yellow-chromate finish provides optimal protection against corrosion in manufacturing facilities, construction sites, and heavy equipment assembly. The 1/2"-13 UNC coarse thread configuration ensures rapid installation in structural steel, machinery bases, and high-vibration environments where fine threads might fail. The external square drive design prevents cam-out issues common with hexagonal drives, allowing maintenance crews to apply maximum torque without damaging the fastener head. These fully threaded screws maintain consistent clamping force across the entire engagement length, making them ideal for critical joints in material handling systems, industrial machinery, and structural frameworks where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This square head screw features precision Unified Standard Class 3A thread fit with 1/2"-13 UNC coarse threading and maintains dimensional accuracy per ASME B18.2.1 specifications. The fastener complies with SAE J429 standards for Grade 5 mechanical properties, including the specified 120,000 psi tensile strength and Rockwell C25 hardness. Manufacturing follows inch system requirements with a 1" length and 3/4" head width, ensuring interchangeability and proper fitment in industrial applications requiring standardized components.