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 Thread pitches are manufactured according to metric coarse thread standards.  | 
          
| A TYPE | B TYPE | C TYPE | ||
|---|---|---|---|---|
Female-female, hexagonal  | 
            Female-female, round type  | 
            Male screw/Female threadHexagonal  | 
            Male screw/Female threadRound type  | 
            Hollow tube(Pipe)  | 
          
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