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           Threads and Points For Type F Thread Cutting Screws      ANSI/ASME B18.6.4 1981

Nominal Size

Threads Per Inch

Major Dia.(D)

Point Dia.(P)

Point Taper Length(S)

Determinant Length For Point Taper(L)

Minimum Practical Nominal Screw

Lengths(L)

Short Screws

Long Screws

Max

Min

Max

Min

Max

Min

Max

Min

90 Heads

Csk Heads

90 Heads

Csk Heads

2

56

.0860

.0813

.068

.061

.062

.045

.080

.062

5/32

3/16

5/32

3/16

4

40

.1120

.1061

.087

.078

.088

.062

.112

.088

7/32

1/4

3/16

1/4

6

32

.1380

.1312

.107

.096

.109

.078

.141

.109

1/4

5/16

1/4

5/16

8

32

.1640

.1571

.132

.122

.109

.078

.141

.109

1/4

11/32

1/4

5/16

10

24

.1900

.1818

.148

.135

.146

.104

.188

.146

11/32

7/16

5/16

13/32

10

32

.1900

.1831

.158

.148

.109

.078

.141

.109

1/4

11/32

1/4

5/16

12

24

.2160

.2078

.174

.161

.146

.104

.188

.146

11/32

7/16

5/16

13/32

1/4

20

.2500

.2408

.200

.184

.175

.125

.225

.175

13/32

17/32

3/8

1/2

5/16

18

.3125

.3026

.257

.239

.194

.139

.250

.194

15/32

19/32

7/16

9/16

3/8

16

.3750

.3643

.312

.293

.219

.156

.281

.219

1/2

11/16

15/32

5/8

 

Suggest Test Plate Thickness & Hole Sizes for Types 1, 23 & F

Nominal Size

Thickness

Hole Size

Gage

Max

Min

Drill Size

Hole Dia.

2-56

18

.0800

.0760

49

.0730

4-40

18

.1110

.1070

41

.0960

5-40

18

.1110

.1070

37

.1010

6-32

14

.1425

.1385

31

.1200

8-32

14

.1905

.1845

26

.1470

10-24

1/8

.1905

.1845

17

.1730

10-32

1/8

.1905

.1845

16

.1770

12-24

1/8

.1905

.1845

8

.1990

-20

3/16

.2530

.2470

1

.2280

5/16-18

3/16

.3155

.3095

L

.2900

3/8-16

3/16

.3780

.3720

T

.3580

-13

3/16

.4710

.4430

29/64

.4531

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