S-91247A112 5/16"-24 x 1 3/4" 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
- Superior corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- High tensile strength of 120,000 psi ensures reliable performance in heavy-duty applications without failure
- Fine UNF threading with Class 2A fit provides precise, vibration-resistant connections that maintain integrity under stress
- Partially threaded design allows for secure clamping while reducing the risk of cross-threading during assembly
- External hex drive and hex head enable easy installation and removal with standard tools, saving time on the job site
- Grade 5 strength classification backed by Rockwell C25 hardness for consistent durability and load-bearing capacity
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, ensuring quality and interchangeability
Professional Applications & Engineering Value
This 5/16"-24 UNF hex head screw is engineered to address critical fastening challenges in industrial settings. The zinc plated steel construction offers enhanced corrosion resistance, making it suitable for outdoor or humid environments where oxidation can compromise fastener integrity. With a fine thread and Class 2A thread fit, it delivers superior vibration resistance, reducing the need for frequent retightening in machinery, automotive assemblies, and structural frameworks. The partially threaded shank provides optimal grip length for secure joint clamping, while the external hex drive ensures compatibility with common wrenches, streamlining maintenance and installation processes. Ideal for heavy-duty applications, this screw meets the demands of industrial fasteners requiring high tensile strength and reliability.
Specification Summary & Compliance
This hex head screw adheres to Class 2A thread fit tolerances per UNF standards, ensuring precise threading for consistent performance. It conforms to ASME B18.2.1 and SAE J429 Grade 5 specifications, guaranteeing mechanical properties and dimensional accuracy. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.
