S-91286A257 3/8"-24 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 demanding applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial environments
- Precision thread engagement with Class 2A UNF fine threading ensuring secure fastening and vibration resistance
- Optimized torque transmission through external hex drive design for efficient installation with standard tools
- Enhanced durability with Rockwell C33 hardness maintaining structural integrity under repeated stress
- Versatile partial threading allowing both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3 and REACH standards for global applications
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance advantages for industrial equipment, heavy machinery, and structural assemblies where high tensile strength and corrosion resistance are paramount. The zinc-flake coated steel construction provides exceptional protection against environmental degradation, while the UNF fine threading with Class 2A fit ensures precise engagement that resists loosening under vibration. The partially threaded design offers dual functionality - full thread engagement in tapped holes combined with unthreaded shank strength. These heavy-duty fasteners are engineered to withstand extreme mechanical stresses in construction, automotive, and manufacturing applications where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 and SAE J429 specifications with Class 2A thread fit tolerance. Features 3/8"-24 UNF fine threading with minimum 1" thread length on a 2 1/2" overall length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe use in international markets.
