Spiral Drill Collars

Product number:

Application:Oil drill collar

Product Details

Spiral Drill Collars by using AISI 4145H chromium molybdenum steel, execute API Specification 7 and SY / T5144 standard,which can be cold thread rolling, copper or phosphate processing, machine double shoulder screw and other specifications special thread.We can produce a maximum outside diameter of 14 inches spiral drill collars.

外径D		切削深度A mm	导程±25.4 mm	切削深度B mm
mm	in	切削深度A mm	导程±25.4 mm	切削深度B mm
98.4	3 7/8	4.0±0.79	914
101.6~111.1	4~4 3/8	4.8±0.79	914
114.3~130.2	4 1/2~5 1/8	5.6±0.79	965
133.4~146.1	5 1/4~5 3/4	6.4±0.79	1067
149.2~161.9	5 7/8~6 3/8	7.1±1.59	1067
165.1~177.8	6 1/2~7	7.9±1.59	1168
181.0~200.0	7 1/8~7 7/8	8.7±1.59	1626	5.6±0.79
203.2~225.4	8~8 7/8	9.5±1.59	1727	6.4±0.79
228.6~250.8	9~9 7/8	10.3±2.37	1829	7.1±1.59
254.0~276.2	10~10 7/8	11.1±2.37	1930	7.9±1.59
279.4	11	11.9±2.37	2037	8.7±1.59
注：螺旋钻铤有3个螺旋槽，右旋，均布