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Drill collars 2-7/8" to 14" connection threads: nc26, nc31, nc38, nc40, nc46, nc50, 5 1/2fh.6 5/8fh. internal upset: iu, eu, ieu heavy weight drill pipe is a medium-weight drilling pipe, (referred standards in api spec 7-1). it has bigger wall thickness than common drilling pipe and smaller than drill collar.
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