S-90002A104 1/4"-20 x 1" ASME B18.2.1, SAE J429 High-Strength Steel Hex Head Screws with Material Certification

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in demanding environments
• Optimized thread engagement through Class 2A thread fit and UNC coarse threading for secure fastening and vibration resistance
• Enhanced durability with Rockwell C33 hardness rating, maintaining structural integrity under repeated stress
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
• Full-thread design ensuring maximum grip length and uniform stress distribution along the entire fastener
• External hex drive compatibility for straightforward installation using standard tools and torque equipment

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The combination of high-strength steel construction and zinc yellow-chromate plating addresses common industrial challenges including corrosion-induced degradation and mechanical fatigue. The UNC coarse threading with Class 2A fit provides excellent engagement in both metallic and composite materials, while the external hex drive design ensures reliable torque transmission during installation. These fully threaded fasteners are engineered to maintain clamping force in vibration-prone environments, making them ideal for construction, automotive, and manufacturing applications requiring ASME B18.2.1 and SAE J429 compliance.

Specification Summary & Compliance

This 1/4"-20 x 1" hex head screw features UNC coarse threading with Class 2A thread fit tolerance for precise engagement. Manufacturing adheres to ASME B18.2.1 dimensional standards and SAE J429 material specifications, ensuring consistent quality and performance. The fastener maintains Grade 8 strength classification with verified 150,000 psi tensile strength and Rockwell C33 hardness. The zinc yellow-chromate plating provides corrosion protection while meeting industry requirements for surface treatments in industrial applications.