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Threads For Self-Tapping Screws Type AB         ANSI B18.6.4

Nominal Size

Threads per Inch

Major Dia.

Minor Dia.

Minimum Practical screw Length

Max

Min

Max

Min

90 Heads

Csk Heads

6

20

.139

.132

.104

.099

9/32

11/32

7

19

.154

.147

.115

.109

5/16

3/8

8

18

.166

.159

.122

.116

5/16

3/8

10

16

.189

.182

.141

.135

3/8

7/16

12

14

.215

.208

.164

.157

7/16

17/32

14

14

.246

.237

.192

.185

1/2

19/32

 

Suggest Test Plate Thickness & Hole Sizes for Types AB, B, 25

Nominal Size

Thickness

Hole Size

Gage

Max

Min

Drill Size

Hole Dia.

2-32

18

.0500

.0460

48

.0760

3-28

18

.0500

.0460

46

.0810

4-24

18

.0500

.0460

44

.0860

5-20

18

.0500

.0460

36

.1065

6-20

14

.0770

.0730

32

.1160

7-19

14

.0770

.0730

30

.1285

8-18

14

.1270

.1230

29

.1360

10-16

1/8

.1270

.1230

21

.1590

12-14

1/8

.1270

.1230

3/16

.1875

-14

3/16

.1905

.1845

5.5mm

.2165

5/16-12

3/16

.1905

.1845

I

.2720

3/8-12

3/16

.1905

.1845

21/64

.3281