S-91286A211 3/8"-16 x 2 1/2" 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 reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
- Optimized torque transmission through external hex drive design for secure installation and removal
- Precise thread engagement with Class 2A thread fit ensuring consistent fastening performance
- Reduced cross-threading risk through UNC coarse threading for faster assembly in demanding conditions
- Partial threading design allowing for both clamping and positioning functions in structural applications
- Regulatory compliance assurance meeting international standards for safety and environmental requirements
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance in heavy machinery, structural steel connections, and industrial equipment where failure is not an option. The zinc-flake coated steel construction provides exceptional corrosion protection, significantly outperforming standard zinc plating in aggressive environments. The 3/8"-16 UNC coarse thread configuration ensures rapid installation while maintaining secure fastening, particularly valuable in field maintenance and production line applications. With Rockwell C33 hardness and 150,000 psi tensile strength, these fasteners withstand extreme vibrational loads and shock impacts common in construction, mining, and transportation equipment. The partially threaded design offers versatility for applications requiring both clamping force and unthreaded shank functionality.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit for precise dimensional accuracy. These inch system fasteners feature 3/8"-16 UNC coarse threads with minimum 1" thread length and 2 1/2" overall length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.
