S-91286A243 3/8"-24 x 1" 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 capability 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
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Maximum hardness durability through Rockwell C33 rating, maintaining structural integrity under repeated use
- Optimized torque transmission via external hex drive design for efficient installation with standard tools
- Full-threaded coverage along the 1" length for consistent clamping force distribution
- Heavy-duty construction meeting Grade 8 specifications for demanding mechanical and structural applications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The 3/8"-24 UNF fine thread configuration provides superior resistance to vibrational loosening in machinery, automotive assemblies, and structural frameworks. The zinc-flake coating offers exceptional protection against corrosion in challenging environments, from manufacturing facilities to outdoor equipment. With fully threaded design and external hex drive, these fasteners ensure maximum engagement depth and straightforward installation using common wrenching tools. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness makes these screws ideal for critical joints in construction equipment, industrial machinery, and transportation applications where reliability under extreme loads is paramount.
Specification Summary & Compliance
These hex head screws feature precise Class 2A thread fit with 3/8"-24 UNF fine threads and right-hand thread direction. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict chemical substance control.
