S-91268A180 3/8"-16 x 1 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior wear resistance thanks to Rockwell C33 hardness and Grade 8 steel construction
- Optimized installation efficiency through external hex drive design and coarse UNC threading
- Precise thread engagement ensured by Class 2A thread fit for vibration-resistant connections
- Strategic material distribution with partial threading to concentrate strength where needed most
- Industry-standard compatibility with ASME B18.2.1 and SAE J429 specifications
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for global applications
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in demanding industrial environments where failure is not an option. The 3/8"-16 UNC coarse thread configuration provides superior resistance to vibration loosening while enabling faster installation in structural steel, heavy machinery, and construction applications. The partially threaded design concentrates the high 150,000 psi tensile strength at critical stress points, while the Rockwell C33 hardness ensures lasting performance in high-wear scenarios. The external hex drive accommodates standard tools for efficient maintenance and assembly operations, making these steel fasteners ideal for equipment manufacturing, structural connections, and industrial maintenance where reliability and compliance with ASME B18.2.1 standards are paramount.
Specification Summary & Compliance
This 3/8"-16 UNC hex head screw features precise Class 2A thread fit tolerances with 1-1/4" length and partial threading beginning at 1" minimum thread length. Manufactured to exacting ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance reliability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
