S-91247A373 1/2"-20 x 7 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments
- Precise thread engagement through Class 2A thread fit and UNF fine threading for secure, vibration-resistant connections
- Optimized torque transmission via external hex drive design that prevents tool slippage during installation
- Enhanced durability from Rockwell C25 hardness rating that maintains structural integrity under repeated stress
- Versatile partial threading allowing unthreaded shank sections to function as precision alignment features
- Regulatory compliance assurance meeting multiple industry standards for quality and environmental safety
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc plated steel construction provides essential protection against environmental degradation in outdoor equipment, structural frameworks, and heavy machinery assemblies. The 1/2"-20 UNF fine threading ensures superior vibration resistance in dynamic load applications, while the external hex drive enables high-torque installation without cam-out issues. The partially threaded design offers precise bearing surface control, making it ideal for applications requiring both clamping force and alignment accuracy. These industrial hex screws are engineered to maintain joint integrity in critical connections where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF (Unified National Fine) thread specifications. Complies with ASME B18.2.1 and SAE J429 Grade 5 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features inch system measurements throughout with precise 7 1/2" length and 1/2"-20 thread size specifications.
