B I 型钻铤螺旋切槽通常尺寸
Spiral grooved drill collars (Type B I ) usual sizes

外径 D		切削深度 A	导程 ± 25.4	切削深度 B
OD		Depth of cut	Spiral pitch	Depth of cut
mm	in	mm	mm	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	2032	8.7 ± 1.59
注： BI 型钻铤有 3 个螺旋槽，右旋，均布
Note:BI style drill collar three spiral grooves, right hand,well distributed.

螺纹连接部位应力分散槽尺寸

Size of connection stress-relief features

钻铤螺纹类型	内螺纹台肩	内螺纹圆柱段	内螺纹圆柱段	外螺纹槽直径	可替代内螺纹
style of	面至最后	直径	后的椎孔锥度	D rc +0 mm	台肩面至应力
connection	一牙刻痕长度 Lx ± 1.59mm length shoulder face of box member	D cb +0.40 mm	±20.83mm/m	-0.79	分散槽长度
-	-	0	Taper of area behind cylinder area of box member	Diameter of pin member at	L RC +0 mm
-	-	Diameter of cylinder area of box member	-	groove	-3.18
-	-	-	-	-	length shoulder face
-	-	-	-	-	to groove of box
-	-	-	-	-	member
NC35	82.6	82.15	166.67	82.15	85.73
NC38	88.9	88.11	166.67	89.3	92.08
NC44	101.6	101.6	166.67	106.36	104.78
NC46(4IF)	101.6	106.76	166.67	109.93	104.78
NC50(4 1 / 2 IF)	101.6	117.48	166.67	120.65	104.78
NC56	114.3	121.84	250	134.14	117.48
NC61	127	132.95	250	149.25	130.18
NC70	139.7	152	250	171.05	142.88
6 5 / 8 REG	114.3	134.14	166.67	137.72	117.48
7 5 / 8 REG	120.7	133.35	250	162.72	123.83
8 5 / 8 REG	123.8	149.25	250	184.94	127
注： NC23 、 NC26 、 NC31 与 2 3 / 8 IF,2 7 / 8 IF 螺纹因壁薄不带应力分散槽。
Note:Connection NC23 、 NC23 （ 2 3/8IF ） and NC31( 2 3/8IF) do not have sufficient metal to accommodate
stress-relief feature