S-91286A509 3/4"-16 x 3" 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 tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance from zinc-flake coating extends service life in harsh environments
- Precise Class 2A thread fit guarantees consistent engagement and vibration resistance
- Heavy-duty Grade 8 classification provides maximum durability for critical assemblies
- External hex drive design enables high-torque installation with standard tools
- Rockwell C33 hardness maintains structural integrity under repeated loading
- Comprehensive compliance with ASME, SAE, RoHS 3 and REACH standards ensures regulatory acceptance
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance in demanding industrial environments where failure is not an option. The 3/4"-16 UNF fine thread configuration provides superior clamping force distribution and vibration resistance compared to coarse threads, making them ideal for machinery, structural steel connections, and heavy equipment assemblies. The zinc-flake coated steel construction addresses corrosion concerns in manufacturing facilities, outdoor applications, and chemical processing environments. With partial threading optimizing grip length, these fasteners prevent joint loosening while the external hex drive accommodates high-torque installation requirements. Engineered to withstand extreme mechanical stresses, these industrial screws ensure long-term reliability in critical bolted connections.
Specification Summary & Compliance
This 3/4"-16 UNF hex head screw features precise Class 2A thread fit tolerances and fine thread spacing per unified screw thread standards. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, making it suitable for global industrial applications requiring certified components.
