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Suggested Hole Sizes for Die Casting

Image Key for Items A-J

The minimum length of thread engagement should be equal to twice the diameter of the screw. The hole diameter, to ensure optimum performance, should provide for 65% to 75% thread engagement.
Screw
Size
Hole Diameter as
Cast Std. Taper
F

Hole
Dia.
as
Drilled
L

Length
of Thread
Engage-
ment
H


Boss
Dia.
Max.
J
Distance
to Edge
for no
Measurable
Distortion - Min.
A - Top
B - Bottom
Max.
Min.
Max.
Min.
M2 x 0.40
1.91
1.83
1.81
1.73
1.81
4.00
3.32
1.04
2-56
.081
.078
.077
.074
.077
.172
.197
.046
M2.5x0.45
2.39
2.31
2.28
2.20
2.28
5.00
4.15
0.55
3-48
.093
.090
.088
.085
.088
.198
.208
.054
M3x0.5
2.90
2.82
2.76
2.68
2.76
6.00
4.98
0.61
5-40
.118
.115
.112
.109
.112
.250
.232
.065
M3.5x0.6
3.31
3.23
3.21
3.13
3.21
7.00
5.81
0.74
6-32
.128
.125
.122
.119
.122
.276
.242
.081
M4x0.7
3.82
3.74
3.64
3.56
3.64
8.0
6.64
0.86
8-32
.155
.152
.148
.145
.148
.328
.272
.081
M4.5x0.75
4.31
4.23
4.11
4.03
4.11
9.00
7.47
0.92
10-24
.177
.174
.168
.165
.168
.380
.315
.108
10-32
.182
.179
.174
.171
.174
.380
.315
.081
M5x0.8
4.8
4.72
4.58
4.50
4.58
10.00
8.30
.098
12-24
.203
.200
.194
.191
.194
.432
.359
.108
M6x1.0
5.75
5.66
5.48
5.40
5.48
12.00
9.96
1.23
M6.3x1.0
6.05
5.97
5.78
5.70
5.78
13.00
10.46
1.23
1/4-20
.235
.232
.224
.221
.224
.500
.415
.130
M7x1.0
6.78
6.70
6.48
6.40
6.48
14.00
11.62
1.23
5/16-18
.267
.294
.284
.281
.284
.625
.519
.144
M8x1.25
7.69
7.61
7.32
7.27
7.35
16.00
13.28
1.53
3/8-16
.359
.356
.343
.340
.343
.750
.623
.162
M10x1.5
9.64
9.56
9.22
9.14
9.22
20.00
16.60
1.84
7/16-14
.419
.416
.400
.397
.400
.875
.726
.186
M12x1.75
11.59
11.51
11.09
11.01
11.09
24.00
19.92
2.15
1/2-13
.481
.478
.460
.457
.460
1.00
.830
.200

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