S-91286A252 3/8"-24 x 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 industrial environments
- Superior corrosion resistance through zinc-flake coating, extending service life in harsh operating conditions
- Precision thread engagement with Class 2A fit and UNF fine threads ensuring secure, vibration-resistant connections
- Optimized torque transmission via external hex drive design for efficient installation and removal with standard tools
- Enhanced mechanical durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental directives
- Strategic partial threading providing unthreaded shank section for improved shear strength in critical applications
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The zinc-flake coated steel construction provides superior corrosion protection compared to conventional platings, making these 3/8"-24 UNF fasteners ideal for outdoor equipment, heavy machinery, and automotive assemblies exposed to moisture and chemicals. The partially threaded design with precise Class 2A thread fit ensures maximum clamping force distribution while preventing thread stripping in soft materials. With 150,000 PSI tensile strength and Rockwell C33 hardness, these industrial hex screws maintain structural integrity in vibration-intensive environments where inferior fasteners would fatigue and fail.
Specification Summary & Compliance
This 2" length hex head screw features 3/8"-24 UNF fine threads with Class 2A thread fit precision manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations regarding chemical safety. Manufacturing adheres to inch system measurements with controlled thread diameter of 0.375" and minimum thread length of 1" on the partially threaded section.
