S-91268A970 1"-8 x 5 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 demanding structural applications
- Superior wear resistance from Rockwell C33 hardness rating ensuring extended service life
- Reliable thread engagement through Class 2A thread fit and UNC coarse threading for vibration resistance
- Optimized drive efficiency with external hex drive design enabling high-torque installation
- Strategic material distribution through partial threading for balanced strength-to-weight ratio
- Regulatory compliance assurance meeting RoHS 3 and REACH environmental standards
- Industry-standard compatibility with ASME B18.2.1 specifications for interchangeability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in critical assemblies where failure is not an option. The 1"-8 UNC coarse threading provides superior resistance to vibrational loosening in machinery, construction equipment, and structural frameworks. Manufactured from high-strength steel with Rockwell C33 hardness, these fasteners maintain integrity under extreme loads while the partial threading design concentrates material where stress is highest. The external hex drive accommodates standard tools for efficient installation in confined spaces, making them ideal for maintenance operations and OEM manufacturing across multiple industries.
Specification Summary & Compliance
This 5 1/2" length hex head screw features precise Class 2A thread fit tolerances with 1"-8 UNC coarse thread spacing and right-hand thread direction. Manufactured to ASME B18.2.1 specifications (SAE J429) with complete compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fastener meets Grade 8 strength classification requirements with verified mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness testing.
