Outside diameter

Depth of cut A

Spiral pitch ±25.4

Depth of cut B

mm

in

mm

mm

mm

98.4

3 7/8

4.0±0.79

914

101.6111.1

44 3/8

4.8±0.79

914

114.3130.2

4 1/25 1/8

5.6±0.79

965

133.4146.1

5 1/45 3/4

6.4±0.79

1067

149.2161.9

5 7/86 3/8

7.1±1.59

1067

165.1177.8

6 1/27

7.9±1.59

1168

181.0200.0

7 1/87 7/8

8.7±1.59

1626

5.6±0.79

203.2225.4

88 7/8

9.5±1.59

1727

6.4±0.79

228.6250.8

99 7/8

10.3±2.37

1829

7.1±1.59

254.0276.2

1010 7/8

11.1±2.37

1930

7.9±1.59

279.4

11

11.9±2.37

2032

8.7±1.59

Figure 1. Spiral drill collar type B

Figure 2. Spiral drill collar type B

Outside diameter

Depth of cut (Max.)

Spiral pitch ±25.4

mm

in

mm

mm

120.7

4 3/4

4.8

1000

155.6

6 1/8

6.4

158.8

6 1/4

6.4

171.5

6 3/4

7.1

184.2

7 1/4

7.9

190.5

7 1/2

7.9

196.9

7 3/4

7.9

203.2

8

9.5

209.6

8 1/4

9.5

215.9

8 1/2

9.5

228.6

9

9.5

241.3

9 1/2

11.9

254.0

10

11.9

Note: B Style Drill Collar, 3 Spiral Grooves, right-hand, well-distributed. ρ= R-e(1-cos3)

Figure 2. Spiral drill collar type B