| 摘要 |
Or the invention A connection (20) for oilwell tubing and the like is disclosed which has the same outer diameter (21) as does the tubing joints (8 /A 9) that it connects. Tubing joints are formed internally with a tapered thread (6 /A 7) having a loadbearing flank angle (75.degree. or more) that negates pullout tendency. A mating coupling (23 having external threads (3 /A 4) may be provided with a bore 10 so as to clear a driftbar. Coupling (2) may be provided with bore (13) extending from (14 to 15) so as to develop substantially, a 100% joint strength. |
