S-91286A299 7/16"-20 x 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 UNF fine threading and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced durability through Rockwell C33 hardness and Grade 8 classification for long-term mechanical integrity
• Optimized torque transmission via external hex drive design allowing for efficient installation with standard tools
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and safety
• Versatile partial threading enabling both clamping and alignment functions in heavy-duty assemblies

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance advantages for demanding industrial applications where failure is not an option. The UNF fine threading provides superior resistance to vibrational loosening compared to coarse threads, while the zinc-flake coating offers exceptional corrosion protection that outperforms conventional platings in harsh environments. The partially threaded design allows for precise clamping force distribution, making these fasteners ideal for heavy machinery, structural steel connections, and automotive assemblies requiring both high tensile strength and reliable thread engagement. With 150,000 psi tensile strength and Rockwell C33 hardness, these screws maintain integrity under extreme loads and repetitive stress cycles, solving common failure points in industrial equipment and construction applications.

Specification Summary & Compliance

This 7/16"-20 hex head screw features precise Class 2A thread fit tolerances and UNF fine thread spacing manufactured to exacting standards. The fastener complies with ASME B18.2.1 dimensional specifications and SAE J429 material requirements for Grade 8 classification. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across various industrial sectors. The 2" length with 1 1/8" minimum thread length provides optimal engagement for critical connections requiring maximum strength and reliability.