... pipe Standard: API 7 and API spec. 5D O.D 2 3/8, 3 1/2, 4, 4 1/2, 5, 5 1/2,6 5 ... /8 Steel Grade: E75, X95, G105, S135 drill pipeapi drill pipe:well drill pipeAPI 7 and API spec ... . 5DSpecification: O.D 2 3/8, 3 1/2, 4, 4 1/2, 5, 5 ... 1/2,6 5/8Steel ...