S-92620A301 5/16"-18 x 2 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

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 through zinc yellow-chromate plating, extending service life in harsh environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster installation and secure fastening
• Maximum thread coverage through full threading along the 2 1/4" length for enhanced grip and distribution of stress
• High durability backed by Rockwell C33 hardness, resisting wear and deformation under heavy loads
• Easy installation and removal with external hex drive and standard 1/2" head width for common tool compatibility
• Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for consistent quality and reliability

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where structural integrity cannot be compromised. The steel construction combined with zinc yellow-chromate plating provides excellent protection against corrosion in industrial settings, while the UNC coarse threads ensure rapid assembly without cross-threading risks. Engineered for heavy-duty applications such as machinery assembly, construction equipment, and automotive frameworks, these fully threaded fasteners maintain consistent clamping force across the entire 2 1/4" length. The external hex drive design allows for high torque application, making them ideal for applications requiring both high tensile strength and reliable, repeatable fastening solutions in demanding environments.

Specification Summary & Compliance

This 5/16"-18 hex head screw features precision Class 2A thread fit with UNC coarse threading (18 TPI) and maintains dimensional accuracy per ASME B18.2.1 and SAE J429 specifications. The fastener meets industry standards for Grade 8 strength classification with verified mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness. Manufacturing complies with relevant industrial specifications, ensuring consistent performance and reliability for professional applications requiring certified steel fasteners with superior corrosion protection.