S-92620A124 3/8"-32 x 2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With a tensile strength of 150,000 psi and Rockwell C33 hardness, this screw withstands extreme stress and prevents failure in critical applications.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life in harsh conditions.
• Precise Thread Engagement: Extra fine UNEF threads and Class 2A thread fit ensure tight, secure fastening with minimal risk of stripping or loosening under vibration.
• High-Strength Material Compliance: Manufactured from Grade 8 steel, it meets rigorous ASME B18.2.1 and SAE J429 standards for reliability in demanding industrial uses.
• Optimized for Heavy-Duty Applications: The partially threaded design and 2" length provide strong clamping force where full threading isn't required, reducing weight without compromising integrity.
• Easy Installation and Removal: The external hex drive and 9/16" head width allow for high torque application with standard tools, speeding up assembly and maintenance.
• Enhanced Durability in Fine-Thread Scenarios: The 3/8"-32 UNEF right-hand thread offers finer adjustment and better resistance to loosening in precision assemblies compared to coarse threads.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses common challenges in machinery, automotive, and construction sectors where vibration, high stress, and corrosion are concerns. The zinc yellow-chromate finish significantly enhances corrosion resistance, making it ideal for outdoor or humid environments. Its extra fine UNEF thread (3/8"-32) provides superior holding power in thin materials or applications requiring precise adjustment, while the Class 2A thread fit ensures consistent, reliable engagement without cross-threading. The partially threaded design concentrates strength where needed, reducing material use and weight without sacrificing the 150,000 psi tensile strength. Compliant with ASME B18.2.1 and SAE J429, it delivers proven performance in structural assemblies, engine components, and high-stress fixtures, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This screw features a 3/8"-32 UNEF extra fine thread with Class 2A thread fit for precise tolerance, ensuring reliable performance in fine-thread applications. It complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The zinc yellow-chromate plating meets industry standards for corrosion protection, and the Grade 8 steel material guarantees high tensile strength and hardness (Rockwell C33). It is manufactured to support heavy-duty use, with partial threading on a 2" length and external hex drive for easy installation.