S-91247A742 1/2"-13 x 9" 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, ideal for demanding structural and machinery applications.
- Superior corrosion resistance due to zinc plating, extending service life in harsh or outdoor environments.
- Reliable mechanical performance ensured by Grade 5 classification and Rockwell C25 hardness for consistent durability.
- Optimized for quick assembly with coarse UNC threading and external hex drive, reducing installation time and effort.
- Secure and precise fit from Class 2A thread tolerance, minimizing the risk of loosening under vibration.
- Versatile partial threading design providing strong clamping force where needed along the 9-inch shank.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and quality.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty industrial and construction settings. The zinc plated steel construction offers a protective barrier against corrosion, which is essential for outdoor infrastructure or equipment exposed to moisture. Its partially threaded design with coarse UNC threads ensures high clamping force is maintained in joint areas, while the unthreaded section adds shear strength. The external hex drive and right-hand thread facilitate straightforward installation with common tools, speeding up assembly in time-sensitive projects like structural steel framing, machinery manufacturing, or heavy vehicle maintenance. By combining 120,000 psi tensile strength with standardized dimensions, this fastener reduces the risk of joint failure and supports long-term operational safety.
Specification Summary & Compliance
This product adheres to Class 2A thread fit for consistent engagement and meets dimensional specifications per ASME B18.2.1 and SAE J429. It is manufactured from steel with a zinc plated finish and is verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental and safety standards are met for global industrial use.
