S-90019A320 3/8"-16 x 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Thread-Locking Hex Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with Nylon Patch thread locker maintains secure fastening from -55° to 250°F, preventing loosening in dynamic environments
• Exceptional load-bearing capacity with 150,000 psi tensile strength and Rockwell C33 hardness for heavy-duty applications
• Superior corrosion protection through zinc yellow-chromate plating extends service life in harsh industrial conditions
• Reliable thread engagement with fully threaded UNC coarse design and Class 2A fit ensures consistent installation performance
• High-torque capability through external hex drive and 9/16" head width facilitates secure tightening with standard tools
• Industry-standard compliance with ASME B18.2.1/SAE J429 specifications guarantees interchangeability and quality assurance
• Temperature-stable performance maintains mechanical properties across extreme operating conditions from -55° to 250°F

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Grade 8 hex head screws deliver critical vibration resistance through their innovative Nylon Patch thread locker technology. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides exceptional structural integrity for heavy machinery, construction equipment, and automotive assemblies where failure is not an option. The zinc yellow-chromate plated steel construction offers superior corrosion protection in exposed applications, while the 3/8"-16 UNC coarse thread design ensures rapid installation and reliable performance in high-vibration environments. These fully threaded fasteners maintain consistent clamping force across the entire 3/4" length, making them ideal for critical joints in manufacturing, transportation, and structural applications where security and durability are paramount.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading and right-hand thread direction. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The external hex drive with 9/16" head width and 1/4" head height provides standardized tool engagement. Meets industry standards for Grade 8 fastener strength classification with verified 150,000 psi tensile strength and material composition requirements.