S-91247A138 5/16"-24 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 high-stress applications, reducing the risk of fastener failure.
- Corrosion-resistant zinc plating extends service life by protecting against rust and environmental degradation in demanding conditions.
- Fine UNF threading provides superior vibration resistance and precise clamping force compared to coarse threads.
- Grade 5 classification guarantees consistent hardness (Rockwell C25) and durability for industrial and automotive uses.
- Partially threaded design allows for secure grip on materials without unnecessary threading, optimizing assembly efficiency.
- External hex drive enables easy installation and removal with standard tools, minimizing downtime.
- Compliance with ASME B18.2.1 and SAE J429 ensures interchangeability and reliability in regulated environments.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered for heavy-duty applications where vibration resistance and high tensile strength are critical. The 5/16"-24 UNF fine thread design enhances grip in metal assemblies, machinery, and structural frameworks, preventing loosening under dynamic loads. Made from zinc plated steel, it offers corrosion protection in industrial or outdoor settings, while the partially threaded shank concentrates force where needed. Ideal for construction, automotive, and equipment manufacturing, it delivers long-term reliability and meets rigorous engineering standards for safety and performance.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit for consistent engagement and ASME B18.2.1 / SAE J429 specifications. It is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety. Dimensions include a 6 1/2" length with a 1 1/8" minimum thread length, right-hand threading, and external hex drive for standardized tool compatibility.
