DTH Drill Pipe with API NC threadDTH drill pipes are widely used in mining,Website: ,water well drilling,geothermal,oil and all kinds of DTH rock drilling,with high quality low carbon steel to ensure good resistance to strengthen and tensile,friction welded to ensure the adapter and pipe connect tightly as a whole set the cyclic extrusion-compression ensure reliable pipeSpecification:(3 1/2")89mm    DTH drill pipe  with  NC26( API 2 3/8 REG)          1500-3000m length(4")102mm   DTH drill pipe  with  NC31( API 2 7/8 REG)             1500-6000m length(4 1/4")108mm   DTH drill pipe  with  NC31( API 2 7/8 REG)          1500-6000m length(4 1/2")114mm   DTH drill pipe  with  NC31( API 2 7/8 REG)or NC35   1500-6000m length(5")127mm   DTH drill pipe  with  NC38( API 3 1/2 IF)               1500-6000m lengthNo.Specifications (mm)CraftConnection typeDiameterLengthThread type1891500-3000NC26(2 3/8 IF)Friction weldingBox/pin21021500-6000NC31 (2 7/8 IF)Friction weldingBox/pin31081500-6000NC31 (2 7/8 IF)Friction weldingBox/pin41141500-6000NC31 (2 7/8 IF)or NC35Friction weldingBox/pin51271500-6000NC38(3 1/2 IF)Friction weldingBox/pin