S-92316A220 5/16"-24 x 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws
High-Strength Grade 8 Steel Flanged 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 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-phosphate steel coating extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
- Flanged hex head design eliminates the need for separate washers, speeding up installation and distributing load evenly.
- UNF fine threading offers improved adjustment accuracy and better resistance to loosening under dynamic loads.
- Grade 8 strength classification guarantees consistent durability and hardness (Rockwell C32) for heavy-duty fastening requirements.
- Full threading along the 3/4" length allows for versatile engagement depth in various material thicknesses.
Professional Applications & Engineering Value
This Grade 8 black-phosphate steel hex head screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and environmental corrosion. The UNF fine thread with Class 3A fit ensures precise engagement in machinery, automotive, and construction assemblies, maintaining clamp load under cyclic stresses. The external hex drive and flanged head simplify installation with standard tools, reducing assembly time while the black-phosphate finish provides a protective layer against moisture and chemicals. Ideal for heavy-duty applications requiring 150,000 psi tensile strength, this screw delivers long-term reliability in demanding environments like equipment manufacturing and structural frameworks.
Specification Summary & Compliance
This fastener adheres to inch system measurements with a thread size of 5/16"-24 UNF fine thread and Class 3A thread fit for high precision. It conforms to IFI 111 / SAE J429 standards for Grade 8 mechanical properties, including Rockwell C32 hardness. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for industrial use.
