S-91247A356 1/2"-20 x 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 capacity with 120,000 PSI tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in various industrial environments
- Precise thread engagement with Class 2A fit and UNF fine thread design ensuring secure fastening and vibration resistance
- Optimized torque transmission through external hex drive and 3/4" head width for easy installation with standard tools
- Enhanced durability with Rockwell C25 hardness providing excellent wear resistance and thread integrity
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting industry standards for quality and environmental safety
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical engineering solutions for industrial equipment, machinery assembly, and structural applications where high tensile strength and reliable fastening are paramount. The zinc plated finish provides essential corrosion protection in environments exposed to moisture and chemicals, while the UNF fine thread configuration maintains superior clamping force under vibration and dynamic loads. The partially threaded design offers precise control over joint compression, making it ideal for applications requiring both alignment and secure fastening. With its external hex drive and standardized dimensions, this fastener ensures compatibility with common installation tools and simplifies maintenance procedures in manufacturing, automotive, and construction sectors.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 1/2"-20 UNF fine thread specifications. Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features Rockwell C25 hardness and 120,000 PSI tensile strength consistent with Grade 5 classification for reliable performance in industrial fastening applications.
