S-90019A330 3/8"-16 x 1" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Thread-Locking Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capability – With 150,000 psi tensile strength and Grade 8 classification, this screw delivers exceptional reliability in high-stress applications.
• Permanent Vibration Resistance – The integrated nylon patch thread locker prevents loosening under dynamic loads, ensuring long-term assembly integrity.
• Superior Corrosion Protection – Zinc yellow-chromate plating on steel provides enhanced resistance to rust and environmental degradation in harsh industrial settings.
• Wide Temperature Tolerance – Operates reliably across an extensive range from -55° to 250°F, making it suitable for both extreme cold and high-heat environments.
• Optimized Thread Engagement – Class 2A thread fit with UNC coarse threading ensures easy installation and consistent clamping force in various materials.
• High Durability – Rockwell C33 hardness guarantees excellent wear resistance and reduced risk of stripping during repeated use.
• Standardized Compatibility – Manufactured to ASME B18.2.1 and SAE J429 specifications, ensuring interchangeability and compliance with industry engineering requirements.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration-induced failure and corrosion are common concerns. The nylon patch locking feature eliminates the need for separate locking washers or adhesives, streamlining installation while providing a permanent seal against back-off. The zinc yellow-chromate plated steel construction offers a robust barrier against moisture, chemicals, and UV exposure, extending service life in outdoor or corrosive environments. With full UNC 3/8"-16 threading and an external hex drive, it enables rapid torque application using standard tools, reducing assembly time in production lines. Ideal for structural frames, engine components, and industrial equipment, this fastener ensures maintained clamp load under cyclic stresses and temperature fluctuations from -55° to 250°F.

Specification Summary & Compliance

This fully threaded screw adheres to Class 2A thread fit tolerances per UNC standards, delivering precise dimensional accuracy for consistent performance. It meets ASME B18.2.1 and SAE J429 mechanical and material specifications, ensuring compliance with recognized industrial benchmarks. The product is also RoHS 3 (2015/863/EU) Compliant, confirming the absence of restricted hazardous substances, and is suitable for global supply chain requirements.