S-90002A112 5/16"-18 x 2" 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 through zinc yellow-chromate plating that protects against harsh industrial environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced durability from Rockwell C33 hardness that maintains structural integrity under repeated stress
• Easy installation and removal with external hex drive design providing superior torque transmission
• Precision manufacturing meeting ASME B18.2.1 and SAE J429 standards for consistent quality and interchangeability
• Versatile partial threading allowing for both clamping force and clearance in complex assembly applications

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions for industrial applications where failure is not an option. The steel construction combined with zinc yellow-chromate plating creates a durable barrier against corrosion in demanding environments from manufacturing equipment to structural assemblies. The UNC coarse thread design ensures rapid installation and superior resistance to vibration loosening, while the partial threading provides optimal stress distribution across fastened components. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain clamping force under extreme loads, making them ideal for heavy machinery, construction equipment, and automotive applications where reliability and safety are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerances ensuring consistent performance and interchangeability. These 5/16"-18 UNC coarse thread screws comply with ASME B18.2.1 and SAE J429 specifications, guaranteeing engineering precision and quality assurance. The 2" length with 7/8" minimum thread length provides optimal engagement for various material thicknesses. The external hex drive and right-hand thread configuration follow industry standards for compatibility with standard tools and installation procedures.