S-90019A350 3/8"-16 x 1 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Thread-Locking Hex Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant secure fastening with nylon patch thread locker that maintains integrity across a wide temperature range from -55° to 250°F
• Exceptional load-bearing capacity with 150,000 psi tensile strength for demanding industrial applications
• Superior corrosion resistance provided by zinc yellow-chromate plating on steel, extending service life in harsh environments
• Reliable installation and removal through external hex drive design that prevents tool slippage under high torque
• Optimized thread engagement with Class 2A thread fit ensuring consistent performance and proper mating
• Enhanced durability from Rockwell C33 hardness that resists wear and deformation under stress
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical performance in heavy machinery, construction equipment, and automotive assemblies where vibration-induced loosening compromises safety. The nylon patch thread locking technology embedded in the 3/8"-16 UNC coarse thread creates permanent friction that eliminates the need for secondary locking devices, reducing assembly time and maintenance costs. Manufactured from zinc yellow-chromate plated steel, it provides superior corrosion protection in outdoor or chemically aggressive environments. The partially threaded design concentrates strength where needed while the external hex drive ensures secure tool engagement during high-torque installation. These engineering features make it ideal for structural connections, equipment frames, and industrial machinery requiring vibration-resistant fastening solutions that maintain clamp load under dynamic stresses.

Specification Summary & Compliance

This fastener features Class 2A thread fit tolerance for consistent mating, 3/8"-16 UNC coarse thread spacing, and partial threading with minimum 1" thread length. Manufactured to ASME B18.2.1 and SAE J429 specifications, it complies with industry standards for dimensional accuracy and mechanical properties. The zinc yellow-chromate plating meets RoHS and REACH environmental compliance requirements while providing corrosion resistance.