S-91247A360 1/2"-20 x 3" 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 tensile strength of 120,000 psi provides reliable performance in high-stress industrial applications
- Superior corrosion resistance through zinc plating extends service life in demanding environments
- Precise Class 2A thread fit ensures smooth installation and secure fastening in critical assemblies
- Heavy-duty Grade 5 classification guarantees consistent performance under substantial mechanical loads
- External hex drive design allows for high-torque installation with standard tools
- Fine UNF threading delivers superior vibration resistance and clamping force distribution
- Partial threading configuration provides optimal grip length while reducing unnecessary thread engagement
Professional Applications & Engineering Value
These Grade 5 hex head screws are engineered to address critical challenges in heavy machinery, structural frameworks, and industrial equipment assembly. The zinc plated steel construction provides essential corrosion protection in manufacturing environments where exposure to moisture and chemicals is common. The 1/2"-20 UNF fine thread configuration offers superior resistance to vibration loosening, making these fasteners ideal for automotive components, construction equipment, and production machinery. With Rockwell C25 hardness and 120,000 psi tensile strength, these partially threaded hex bolts maintain structural integrity under extreme mechanical stress, preventing joint failure in critical applications while the external hex drive ensures reliable installation with standard industrial tools.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF fine thread specifications, these hex head screws comply with ASME B18.2.1 and SAE J429 Grade 5 standards. The fasteners feature precise dimensional control with 1/2"-20 thread size and 3" length configuration. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures these components meet international safety and environmental standards for industrial applications.
