... 5)Coating:ARNCO100 api 5dp drill pipe,drill collar,welded/integral heavy weight drill pipe and kelly M&B ... plastic coat DS/HT TJ Our API 5dp drill pipe are of high physical property, for ... and drilling operation, all threads are also phosphated or coppered, and all the roots are cold rolled. ... The products shall be equipped with pressed steel or plastic steel thread protectors on the connections. Our ...