If I have the measurements of the threads on a connection I want to replace with a new one from you, how do I know what inch or millimeter size it corresponds to?

To find the right one, you can start from this table. Keep in mind that it can hit up to 5 mm when measuring over threads so it is not accurate but indicative.

R - Inch - Inv thread - Utv thread

R6 - 1/8" - 9mm - 10mm
R8 - 1/4" - 12mm - 13mm
R10 - 3/8" - 15mm - 17mm
R15 - 1/2" - 19mm - 21mm
R20 - 3/4" - 24mm - 26mm
R25 - 1" - 31mm - 33mm
R32 - 1 1/4" - 39mm - 42mm
R38 - 1 1/2" - 45mm - 48mm
R50 - 2" - 57mm - 59mm
R65 - 2 1/2" - 72mm - 75mm
R80 - 3" - 85mm - 88mm
R100 - 4" - 110mm - 113mm

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