British Threads - ME
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 |