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# 连接套管

Because of different applications, we need different lengths of drill stems, so couplings sleeves are used for connecting extension rods. There are semi-bridge couplings and full bridge couplings, the only difference between them is that semi-bridge couplings have a middle stop at the middle of couplings. Usually couplings two ends are the same couplings, like R25, R32,R38,T45, T51, etc .While sometime people need crossover couplings to work, for example, one end is R32 and another end is R38, but basically all couplings are female threads at the two ends.

 ConnectionD1 Length diameter Connection D2 mm mm R22 100 32 R22 R32 160 48 R32 R32 170 55 R32 R25 160 37 R25 R38 170 55 R38 T38 190 55 T38 T45 210 64 T45 T51 225 75 T51 T38 185 55 T38