S-91286A179 5/16"-18 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc-flake coating that withstands harsh industrial environments
- Reliable mechanical performance maintained by Rockwell C33 hardness and Grade 8 certification
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and vibration resistance
- Secure external hex drive providing maximum torque transfer during installation and removal
- Partial threading design offering both gripping strength and clearance flexibility
- Full regulatory compliance meeting ASME B18.2.1, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in demanding applications where failure is not an option. The zinc-flake coated steel construction provides superior corrosion protection for outdoor equipment, machinery, and structural frameworks exposed to environmental elements. The 5/16"-18 UNC coarse thread configuration ensures rapid installation in production environments while maintaining vibration resistance in dynamic applications. With partial threading and 150,000 psi tensile strength, these fasteners are engineered for heavy machinery, construction equipment, and automotive assemblies where both clamping force and shear strength are critical. The external hex drive allows for high-torque installation using standard tools, reducing assembly time while preventing stripping in high-stress applications.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent performance. Complies with ASME B18.2.1 specifications and SAE J429 standard for Grade 8 fasteners. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for environmental safety. Thread specifications include 5/16"-18 UNC coarse thread with right-hand direction and minimum 7/8" thread length on a 5" overall fastener.
