Q:

Difference between 1/2×20 and 1/2×28 unf threads?

what do the numbers 20 and 28 represent? If i were to put 1/2″x28 threads on a condor barrel would i still be able to put on accessories?

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It would but only accesoiries havin 1/2’28UNEF threads.
That number represents number of threads per inch!
Most accesoiries are 1/2-20UNF

Regards,

Marc

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