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Thetapertapisaspecialfishingtoolmakingthreadintubedroppedobjectsuchasdrillpipeandoiltube.Thetapsareturnedfromhightrengthalloysteelforgingmaterialsandheattreated.Itismadewithchipgroovesoastomakethreads.Theboxtapisaspecialexternalfishingtoolwhichisengagedontheoutsidewalloftubingobjectssuchasoiltubinganddrillpipe.
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