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ME = Model Engineer Threads

These come in 32 and 40 tpi sizes


No official across flats dimensions are given for ME ( Model Engineer ) threads as nuts and bolts are not commercially available


P = Pitch = 1/Number of threads per inch (tpi)
h = Angular Depth = 0.960491 x P
D = Depth of Rounding = 0.073917 x P
h/6 = Shortening = 0.160083 x P
d = Actual Depth = 0.640327 x P
r = Radius at the Crest & Root = 0.137329 x P
C = Core diameter = Major Diameter - 1.280654 x P
Effective or Pitch Diameter = Major Diameter - .640327 x P

Model Engineer ( M.E.) threads and tap drill sizes

Diameter

TPI

Tap drill (metric)

Tap drill

Clearance (metric)

Clearance Outside

1/8

40

2.40

3/32

3.30

No. 30

5/32

40

3.25

No. 30

4.2

No. 19

3/16

40

3.90

No. 23

5.00

No. 10

7/32

40

4.75

No. 13

5.8

No. 1

1/4

32

5.6

No. 2

6.6

G

1/4

40

5.5

No. 3

6.6

G

9/32

32

6.6

G

7.2

9/32

9/32

40

6.5

F

7.2

9/32

5/16

32

7.0

J

8.2

P

5/16

40

7.3

L

8.2

P

3/8

32

8.6

R

9.8

W

3/8

40

8.9

S

9.8

W

7/16

32

10.3

Y

11.4

29/64

7/16

40

10.5

Z

11.4

29/64

1/2

32

11.9

15/32

13

33/64

1/2

40

12.1

15/32

13

33/64

 

                           

 

 

 

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