S-91247A638 3/8"-16 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
- Superior corrosion resistance with zinc plating that protects against rust and extends service life in demanding environments
- High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration, reducing failure risks
- Rockwell C25 hardness provides excellent durability and resistance to wear, maintaining thread integrity over time
- Coarse UNC threading allows for faster installation and easier alignment, saving time in assembly operations
- Class 2A thread fit offers consistent, precise engagement with nuts for secure fastening without binding
- External hex drive design enables high torque application with standard tools, ensuring tight and stable connections
- Partially threaded shank with 1" minimum thread length provides optimal grip and shear strength where needed
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address common industrial challenges such as joint loosening under dynamic loads and environmental corrosion. The zinc plated steel construction offers a protective barrier against moisture and chemicals, making it ideal for outdoor machinery, automotive assemblies, and structural frameworks. Its 3/8"-16 UNC coarse thread ensures quick, reliable fastening in materials where fine threads might strip, while the external hex drive allows for efficient installation with common wrenches. By combining 120,000 psi tensile strength and Rockwell C25 hardness, this fastener maintains clamp force in high-stress applications, reducing maintenance needs and enhancing operational safety in industrial fastening systems.
Specification Summary & Compliance
This product adheres to precise dimensional standards with Class 2A thread fit and UNC coarse threading for consistent performance. It meets ASME B18.2.1 and SAE J429 specifications, ensuring manufacturing quality and interchangeability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and restricts hazardous substances, supporting sustainable procurement in global supply chains.
