What Are The Unified Threads Of Fastener?
The term “Unified threads” in the context of fasteners refers to a standardized thread system used in the United States, Canada, and occasionally in other countries. This standard specifies the thread form, series, tolerance, and designation for fasteners. Unified Thread Standard (UTS) is the dominant thread standard used in the majority of screws, nuts, bolts, and other fasteners.
The Unified Thread Standard includes:
Unified Coarse (UNC): This is the most common thread series used in bulk production and general-purpose fastening. It has a larger thread pitch (fewer threads per inch) compared to other types, which makes it more suitable for threading into lower strength materials and for easier assembly. Coarse threads are more resistant to stripping and cross-threading.
Unified Fine (UNF): This series has a smaller thread pitch (more threads per inch) than UNC, providing a higher tensile strength than coarse threads. Fine threads are better for adjusting mechanisms and are used in applications where higher strength and precision are needed.
Unified Extra Fine (UNEF): This series has an even smaller thread pitch than UNF, offering the highest precision and strength. It’s commonly used in applications requiring fine adjustments and in materials that are brittle or thin.
Unified 8-Thread Series (8UN): This is a series of threads with eight threads per inch, regardless of the diameter. It’s typically used for large diameter bolts and nuts and provides a good balance between strength and ease of assembly. This series is often seen in high-pressure and high-temperature applications.
Unified threads are designated by a specific nomenclature that includes the major diameter (in inches), the thread pitch (for UNC and UNF) or the number of threads per inch, and the thread series (UNC, UNF, UNEF, UNS). For example, a 1/4″-20 UNC thread has a 1/4-inch major diameter and 20 threads per inch, following the UNC standard.
This standard ensures compatibility and interchangeability among fasteners, making it easier to select and use them in various applications.
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