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Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

British Association Threads

B.A.

Tapping Drill

Clearance Drill

 

inches

mm

inches

mm

0

0.189

4.8

0.242

6.147

1

0.166

4.216

0.213

5.410

2

0.147

3.734

0.191

4.851

3

0.1285

3.264

0.166

4.216

4

0.111

2.819

0.147

3.734

5

0.098

2.489

0.136

3.454

6

0.086

2.184

0.116

2.946

7

0.076

1.930

0.104

2.462

8

0.067

1.702

0.0935

2.375

9

0.0595

1.511

0.081

2.057

10

0.0465

1.181

0.073

1.854

11

0.042

1.067

0.067

1.702

12

0.037

0.940

0.055

1.397

13

0.035

0.889

0.055

1.397

14

0.028

0.711

0.0469

1.191

15

0.025

0.635

0.040

1.016

16

0.0225

0.572

 

 

17

0.020

0.508

 

 

18

0.018

0.457

 

 

19

0.0145

0.368

 

 




Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z