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Suggested Hole Sizes for Die Casting Screws

The chart below lists the suggested hole sizes for die casting for various industrial machine screw sizes.

Hole sizes for die casting screws from Leland Powell.

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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