S-91247A442 5/8"-18 x 3 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 high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise Class 2A thread fit provides smooth assembly and secure fastening, minimizing the chance of cross-threading and improving installation efficiency.
- High hardness rating (Rockwell C25) offers excellent wear resistance, maintaining thread integrity and durability over repeated use.
- Partially threaded design allows for controlled clamping force and optimal grip in materials where full threading is not required.
- External hex drive and hex head enable easy installation and removal with standard tools, speeding up maintenance and assembly processes.
- Compliance with major standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interoperability in regulated industries.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical fastening challenges in heavy-duty industrial settings. The zinc plated steel construction provides a durable barrier against moisture and chemicals, preventing corrosion in environments like manufacturing plants and outdoor machinery. With a fine UNF thread and Class 2A fit, it delivers precise engagement and vibration resistance, reducing loosening in dynamic applications such as automotive assemblies, construction equipment, and structural frameworks. The partially threaded shank ensures optimal load distribution, making it ideal for components requiring firm clamping without thread interference. By meeting ASME B18.2.1 and SAE J429 specifications, it guarantees reliability and safety, minimizing downtime and maintenance costs for B2B clients.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances for consistent assembly and is manufactured in accordance with ASME B18.2.1 and SAE J429 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory alignment for global industrial use.
