... DRILLING STABILIZERS, SUCKER ROD COUPLING PROFESSIONAL MANUFACTURER API 11B STANDARD ... coupling, class T coupling, Altra High Strength,Sub OD coupling, with various spec. of Full size, Slim Hole, grand chamfer, Two-way ... China.PRODUCT BRIEFThe SPRAY METAL sucker rod coupling is processed with some special technology, ... preventing and slowing down the wear. The coupling has many types and sizes, and it ...