S-91257A467 3/8"-24 x 5 1/4" 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 through zinc yellow-chromate plating, extending service life in demanding environments
- Precision thread engagement with Class 2A fit and UNF fine threads ensuring vibration resistance and secure fastening
- Optimized torque transmission via external hex drive design and 9/16" head width for efficient installation
- Reduced assembly weight through partial threading while maintaining 1" minimum thread length for sufficient grip
- Enhanced durability with Rockwell C33 hardness providing excellent wear resistance against repeated use
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality and interoperability
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The 3/8"-24 UNF fine thread configuration provides superior vibration resistance in dynamic equipment, while the zinc yellow-chromate plating creates a protective barrier against industrial contaminants and moisture. The partially threaded design allows for precise clamp load distribution, making these heavy-duty fasteners ideal for structural assemblies, machinery frames, and automotive components where 150,000 psi tensile strength ensures joint integrity under extreme operating conditions. The external hex drive facilitates quick installation with standard tools, reducing assembly time in production environments.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 3/8"-24 UNF fine thread spacing and 1" minimum thread length. Full compliance with ASME B18.2.1 dimensional standards and SAE J429 material specifications for Grade 8 fasteners. The zinc yellow-chromate plating meets industrial corrosion protection requirements while the Rockwell C33 hardness ensures consistent performance across temperature variations and loading conditions.
