S-91247A128 5/16"-24 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 with 120,000 psi rating ensures reliable performance in high-stress applications, reducing failure risks.
- Superior corrosion resistance from zinc plating extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 2A thread fit with 5/16"-24 UNF fine threading provides secure, vibration-resistant connections for critical assemblies.
- Grade 5 steel construction with Rockwell C25 hardness delivers optimal durability and fatigue resistance under heavy loads.
- External hex drive design allows for easy installation and high torque application with standard tools, improving assembly efficiency.
- Partial threading configuration combines gripping power with unthreaded shank strength, ideal for clamping applications.
- Full regulatory compliance with ASME B18.2.1, RoHS 3, and REACH ensures safety and environmental standards are met.
Professional Applications & Engineering Value
This Grade 5 hex head screw addresses critical engineering challenges in heavy machinery, automotive, and construction applications where vibration resistance and structural integrity are paramount. The 5/16"-24 UNF fine thread configuration maintains clamping force under dynamic loads, while the zinc plated finish provides essential corrosion protection in outdoor or humid environments. The partially threaded design offers superior shear strength in bolted joints, making it ideal for equipment requiring precise alignment and long-term reliability. With 120,000 psi tensile strength and Rockwell C25 hardness, this fastener delivers consistent performance in demanding industrial settings where failure is not an option.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications with Class 2A thread fit tolerance for precision engagement. The 5/16"-24 UNF fine thread maintains dimensional accuracy per industry standards. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Grade 5 classification ensures mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness are consistently maintained.
