Can you mix 2A and 3B threads?

The requirements for screw thread fits for specific application are predicated on end use and can be met by specifying the proper combinations of thread classes for the components. For example, a Class 2A external thread may be used with a Class 1B, 2B or 3B internal thread.



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Classes 2A-2B Class 2A external threads have an allowance, Class 2B internal threads do not. Classes 2A and 2B, for most engineering applications, offer the optimum thread fit that balances fastener performance, manufacturing convenience and economy.

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?Class 2B is the typical fit for commercial products and is used for fasteners and threaded parts. Class 3B is the tightest tolerance and used for close fit and high strength fastening applications where a close and snug fit are required.

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Size for size, a fine thread is stronger than a coarse thread. This is both in tension (because of the larger stress area) and shear (because of their larger minor diameter). Because of the smaller pitch, they allow finer adjustments in applications that need such a feature.

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