S-91247A728 1/2"-13 x 4" 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 ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Zinc plating provides superior corrosion resistance, extending the service life of the screw in harsh industrial environments.
- Grade 5 classification and Rockwell C25 hardness guarantee consistent durability and resistance to wear under heavy loads.
- Coarse 1/2"-13 UNC threading with Class 2A fit allows for quicker assembly and secure fastening in a variety of materials.
- Partially threaded design offers optimal clamping force where needed, improving joint stability in structural applications.
- External hex drive and hex head enable easy installation and high torque application with standard tools, saving time on the job site.
- Compliance with ASME B18.2.1, SAE J429, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for safe, global use.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address common challenges in heavy-duty industrial settings, such as vibration loosening and corrosion-induced failure. Made from zinc plated steel, it combats rust effectively, making it ideal for outdoor machinery, construction frameworks, and automotive assemblies. The 1/2"-13 UNC coarse thread and partial threading provide excellent grip and controlled tension distribution, reducing the need for frequent maintenance. With a right-hand thread and external hex drive, it ensures straightforward installation in tight spaces, enhancing efficiency in production lines and repair operations while meeting rigorous ASME B18.2.1 specifications for reliability.
Specification Summary & Compliance
This fastener features precise Class 2A thread fit and UNC coarse threading with a minimum thread length of 1 1/4", ensuring dimensional accuracy per ASME B18.2.1 and SAE J429 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial applications without hazardous substances.
