S-92620A554 1/4"-20 x 3 1/2" 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 Grade 8 strength rating and 150,000 psi tensile strength for critical structural applications
• Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
• Optimized thread engagement with Class 2A UNC coarse threads ensuring reliable installation and vibration resistance
• Enhanced durability from Rockwell C33 hardness maintaining fastener integrity under extreme stress conditions
• Full-threaded design providing consistent clamping force along the entire 3-1/2" length for uniform load distribution
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed performance and interchangeability
• Efficient installation with external hex drive design allowing high-torque application using standard tools

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value in demanding applications where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion resistance for outdoor equipment, machinery, and structural assemblies exposed to environmental elements. The UNC coarse thread pattern with Class 2A fit ensures rapid installation and reliable performance in vibration-prone environments, while the fully threaded design maintains consistent clamping force across the entire fastener length. Engineered to ASME B18.2.1 and SAE J429 standards, these heavy-duty fasteners are ideal for construction equipment, automotive frames, and industrial machinery where 150,000 psi tensile strength and Rockwell C33 hardness are critical for long-term reliability.

Specification Summary & Compliance

This 1/4"-20 x 3-1/2" hex head screw features precise Class 2A thread fit with UNC coarse threading and right-hand thread direction. Manufactured to exacting ASME B18.2.1 dimensional standards and SAE J429 material specifications, ensuring consistent quality and performance. The fastener maintains strict compliance with industry standards for dimensional accuracy, mechanical properties, and surface treatment requirements, providing reliable performance in critical engineering applications.