B- Type (ISO 3552-1) Metric Core Bits

Size

Outside Set Diameter

Inside Set Diameter

Inch

mm

inch

mm

B36

1.422 / 1.412

36.12 / 35.87

0.859 / 0.849

21.82 / 21.57

B46

1.818 / 1.808

46.18 / 45.92

1.253 / 1.243

31.82 / 31.57

B56

2.210 / 2.200

56.13 / 55.88

1.647 / 1.637

41.83 / 41.58

B66

2.603 / 2.593

66.12 / 65.87

2.040 / 2.030

51.81 / 51.56

B76

2.997 / 2.987

76.12 / 75.87

2.434 / 2.424

61.82 / 61.57

B86

3.391 / 3.381

86.13 / 85.88

2.828 / 2.818

71.83 / 71.58

B101

3.981 / 3.971

101.12 / 100.87

3.418 / 3.408

86.82 / 86.57

B116

4.575 / 4.560

116.20 / 115.82

4.009 / 3.999

101.83 / 101.58

B131

5.165 / 5.150

131.19 / 130.81

4.599 / 4.589

116.82 / 116.57

B146

5.755 / 5.740

146.18 / 145.80

5.190 / 5.180

131.82 / 131.57

 

 

 

 

 

 

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