S-91286A506 3/4"-16 x 2 3/4" 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 and Grade 8 classification for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
• Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
• Optimized torque transmission through the external hex drive and 1 1/8" head width for easy installation with standard tools
• Enhanced durability from Rockwell C33 hardness maintaining structural integrity under repeated stress
• Versatile partial threading allowing unthreaded shank sections for precise clamping in assembled components
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The 3/4"-16 UNF thread configuration with Class 2A tolerance provides superior thread engagement in high-vibration environments like heavy machinery, structural steel connections, and automotive assemblies. The zinc-flake coated finish offers exceptional corrosion protection, significantly outperforming conventional zinc plating in corrosive industrial atmospheres. With partial threading and 2 3/4" length, these fasteners enable precise clamping force distribution while the external hex drive and substantial head width ensure reliable torque application without stripping. These screws solve critical engineering challenges by combining maximum 150,000 PSI tensile strength with compliance to major industrial standards.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 3/4"-16 UNF fine threading and 1 3/4" minimum thread length. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting the latest environmental regulations for industrial fasteners. Material certification confirms Grade 8 strength classification with verified Rockwell C33 hardness and 150,000 PSI tensile strength.