S-91247A371 1/2"-20 x 6 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 tensile strength of 120,000 psi ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc plating protects against rust and extends service life in harsh environments.
- Fine UNF threading provides improved vibration resistance and secure fastening in precision assemblies.
- Grade 5 steel construction offers a balance of high strength and durability, suitable for heavy-duty mechanical uses.
- Partially threaded design allows for controlled clamping force and easier alignment in structural applications.
- Class 2A thread fit ensures consistent, easy assembly with standard nuts while maintaining secure connections.
- External hex drive enables quick installation and removal with common tools, boosting efficiency in maintenance and assembly.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address common industrial challenges such as vibration loosening and corrosion in heavy machinery, construction, and automotive assemblies. The fine UNF thread and partial threading design enhance grip and distribution of load, reducing stress concentrations. Made from high-strength steel with a zinc-plated finish, it resists environmental degradation, ensuring long-term reliability in outdoor or corrosive settings. Ideal for applications requiring high tensile strength and compliance with industry standards, this fastener minimizes downtime and maintenance costs in industrial fastening systems.
Specification Summary & Compliance
This screw features a 1/2"-20 UNF thread with Class 2A fit for precise tolerance, a 6 1/2" length, and partial threading up to a minimum of 1 1/2". It meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are adhered to.
