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Crossover Subs
Crossover subs join drill string components of different sizes or thread connections (Figure 1: Crossover Sub and Figure 2: Non-magnetic corssover sub). For example, a double-box crossover would be needed to join a bit with an API Regular pin connection to a drill collar with API Full Hole pin connection. It is important to keep track of the types of connections on each component of the drill string, and to make sure that the appropriate crossovers are available.
