S-91247A633 3/8"-16 x 2 1/4" 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 demanding applications, reducing the risk of fastener failure.
- Zinc plating provides corrosion resistance, extending service life in harsh industrial environments and minimizing maintenance needs.
- Grade 5 classification and Rockwell C25 hardness offer a robust balance of strength and durability for repeated use.
- UNC coarse thread design enables faster installation and better grip in softer materials, improving assembly efficiency.
- External hex drive and hex head allow for easy tightening with standard tools, reducing installation time and labor costs.
- Class 2A thread fit ensures consistent, reliable engagement with nuts and tapped holes, preventing loosening under vibration.
- Partial threading provides unthreaded shank for enhanced shear strength, ideal for applications requiring precise clamping force.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this 3/8"-16 Grade 5 hex head screw addresses critical challenges in machinery assembly, structural framing, and equipment manufacturing. The zinc plated steel finish combats corrosion in humid or outdoor settings, while the UNC coarse thread and external hex drive simplify installation in high-volume production lines. With a tensile strength of 120,000 psi and Rockwell C25 hardness, it withstands dynamic loads and vibrations, reducing downtime and replacement costs. Ideal for construction, automotive, and agricultural machinery, this fastener ensures long-term reliability where secure fastening is non-negotiable.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit for consistent dimensional accuracy and meets ASME B18.2.1 and SAE J429 specifications, ensuring interoperability with standard components. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing. The partially threaded design and coarse thread spacing align with industrial norms for reliable performance in varied applications.
