S-91286A514 3/4"-16 x 4" 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 demanding industrial applications
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh environments
- Reliable thread engagement through Class 2A thread fit and UNF fine threading for vibration resistance
- Optimized torque transmission with external hex drive and 1 1/8" head width for secure installation
- Grade 8 certification ensuring consistent performance with Rockwell C33 hardness specification
- Partial threading design allowing for both clamping and unthreaded shank functionality
- Regulatory compliance meeting ASME B18.2.1, SAE J429 standards and environmental regulations
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical performance in heavy-duty industrial applications where failure is not an option. The 3/4"-16 UNF fine threading provides superior resistance to vibrational loosening in machinery, construction equipment, and structural assemblies. The zinc-flake coated steel construction offers exceptional corrosion protection, making it suitable for outdoor applications and harsh environmental conditions. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains integrity under extreme loads while the 4" length with partial threading allows for precise clamping force distribution. The external hex drive and substantial 1 1/8" head width ensure reliable torque application during installation and maintenance procedures.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNF fine thread spacing (16 threads per inch). Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features right-hand thread direction with minimum thread length of 1 3/4" on a 4" overall length fastener.
