S-92620A659 3/8"-24 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance with zinc yellow-chromate plating extends service life in harsh industrial environments.
• Precision Class 2A thread fit provides consistent engagement and reduces cross-threading during installation.
• Full threading design offers maximum grip length and uniform load distribution across the entire fastener.
• High-strength Grade 8 classification with Rockwell C33 hardness guarantees durability under heavy-duty conditions.
• External hex drive design allows for high-torque installation using standard tools, improving assembly efficiency.
• Compliance with ASME B18.2.1 and SAE J429 standards ensures consistent quality and interchangeability in industrial applications.

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical performance in demanding applications where fastener integrity is non-negotiable. The 3/8"-24 UNF fine threading provides superior resistance to vibration loosening compared to coarse threads, making it ideal for machinery, automotive assemblies, and structural frameworks. The zinc yellow-chromate plating creates a protective barrier against corrosion, significantly extending service life in environments exposed to moisture or chemicals. With full threading along its 2 1/2" length, it ensures maximum clamping force distribution, preventing joint failure in heavy-load scenarios. These engineering features address common industrial pain points including vibration-induced fatigue, corrosion degradation, and installation inefficiency.

Specification Summary & Compliance

This fastener features Class 2A thread fit per UNF standards, ensuring precise dimensional accuracy and compatibility. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications, guaranteeing consistent quality and performance. The right-hand thread direction with fine thread spacing provides optimal engagement in high-vibration environments. Material composition meets industry standards for Grade 8 strength classification, validated by 150,000 psi tensile strength and Rockwell C33 hardness testing.