S-91286A369 1/2"-20 x 1 1/2" 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 provided by zinc-flake coating, extending service life in harsh industrial environments
• Precise thread engagement with Class 2A fit UNF fine threads ensuring secure fastening and vibration resistance
• Maximum hardness durability through Rockwell C33 rating, maintaining structural integrity under repeated use
• Optimized torque transmission via external hex drive and 3/4" head width for efficient installation with standard tools
• Full-threaded design offering consistent clamping force along the entire 1½" length for uniform stress distribution
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The steel construction with Rockwell C33 hardness provides exceptional resistance to deformation under heavy loads, while the zinc-flake coating offers superior protection against corrosion in challenging environments. The 1/2"-20 UNF fine threads with Class 2A fit ensure precise mating with corresponding components, reducing the risk of cross-threading and providing reliable vibration resistance in machinery, structural assemblies, and heavy equipment. The external hex drive design allows for high torque application during installation, making these fully threaded screws ideal for critical joints requiring maximum clamping force and long-term reliability in construction, automotive, and manufacturing sectors.

Specification Summary & Compliance

This inch system fastener features precise Class 2A thread fit according to UNF thread standards, manufactured to meet ASME B18.2.1 and SAE J429 specifications. The product maintains dimensional accuracy with 1/2"-20 thread size, 1½" length, and 3/4" head width. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and restricted substance adherence for global industrial applications.