S-92620A556 1/4"-20 x 4 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 150,000 psi tensile strength for critical structural applications
• Superior corrosion resistance through zinc yellow-chromate plating in harsh industrial environments
• Precise thread engagement with Class 2A UNC coarse threads ensuring reliable installation
• Exceptional durability from Grade 8 steel construction and Rockwell C33 hardness rating
• Easy installation and removal with standard external hex drive design
• Full-threaded coverage along the 4½" length for maximum grip and distribution
• Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional performance in demanding industrial applications where failure is not an option. The zinc yellow-chromate plating provides superior corrosion protection for outdoor equipment, machinery, and structural assemblies exposed to harsh environments. With 150,000 psi tensile strength and Rockwell C33 hardness, these fully threaded UNC coarse thread fasteners maintain integrity under extreme vibration and dynamic loads. The external hex drive design allows for high torque application, making them ideal for heavy machinery, construction equipment, and automotive applications where reliable, high-strength fastening solutions are critical for operational safety and longevity.

Specification Summary & Compliance

Manufactured to exacting standards with Class 2A thread fit tolerance for consistent performance. These 1/4"-20 UNC coarse thread screws comply with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The 4½" length and fully threaded design provide maximum engagement, while the zinc yellow-chromate finish meets industry standards for corrosion protection in demanding industrial environments.