The UNF-2A and UNF-2B thread designations refer to different classes of Unified National Fine (UNF) threads, which are standardized threads used in the United States for fastening applications.
UNF-2A and UNF-2B threads are the most commonly used for general applications, including production of bolts, screws, nuts and similar fasteners.
The main difference between UNF-2A and UNF-2B lies in their tolerances, specifically in terms of thread fit. The “A” and “B” designations represent different classes of fit:
UNF-2A threads apply to external (male) threads only, UNF-2A threads have a tighter tolerance compared to UNF-2B threads. This class is used when a closer fit and higher precision are required for the external threads.
UNF-2B threads apply to internal (female) threads only, UNF-2B threads have a looser tolerance compared to UNF-2A threads. This class is used when a looser fit is acceptable for internal threads, and it may provide more room for the mating external threads.
In summary, the choice between UNF-2A and UNF-2B depends on the specific requirements of the application and the desired level of thread fit precision. UNF-2A is used for external threads where a closer fit is needed, while UNF-2B is used for internal threads where a looser fit is acceptable.
QC Hydraulics can produce and supply stainless steel JIC male and female hydraulic fittings with UNF threads, please contact us for more details if interested.
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- JIC Female Hose Fittings
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- JIC Male Hose Fittings
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- JIC Female Weld-on Fittings
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- JIC Male Adjustable Elbow
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- JIC Male Compression Fittings
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- JIC Male Plug