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Screw Thread Conversion Table
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Screw Thread Conversion Table
Screw Thread
Conversion Tables
MAJOR DIAMETER (Converted to INCH Decimals)
NOMINAL DIAMETER (mm)
MAJOR DIAMETER
mm
INCH
M 1
1
.0393
M 1.1
1.1
.0433
M 1.2
1.2
.0472
M 1.4
1.4
.0551
M 1.6
1.6
.0629
M 1.8
1.8
.0708
M 2
2
.0787
M 2.2
2.2
.0866
M 2.3
2.3
.0905
M 2.5
2.5
.0984
M 2.6
2.6
.1023
M 3
3
.1181
M 3.5
3.5
.1378
M 4
4
.1574
M 4.5
4.5
.1771
M 5
5
.1968
M 6
6
.2362
M 7
7
.2755
M 8
8
.3149
M 10
10
.3937
M 12
12
.4724
M 14
14
.5511
M 16
16
.6299
M 18
18
.7086
M 20
20
.7874
M 22
22
.8661
M 24
24
.9448
M 27
27
1.0629
M 30
30
1.181
M 33
33
1.299
M 36
36
1.417
M 39
39
1.535
M 42
42
1.654
M 45
45
1.772
M 48
48
1.890
M 52
52
2.047
M 56
56
2.205
M 60
60
2.362
M 64
64
2.520
M 68
68
2.677
M 72
72
2.835
M 76
76
2.992
M 80
80
3.150
M 85
85
3.346
M 90
90
3.543
M 95
95
3.740
M 100
100
3.937
M 105
105
4.134
M 110
110
4.331
M 115
115
4.538
M 120
120
4.724
M 125
125
4.921
M 130
130
5.118
M 135
135
5.315
M 140
140
5.512
M 145
145
5.709
M 150
150
5.906
THREAD PITCH (Converted to Number of Threads per Inch)
PITCH (mm)
Approx. Threads per Inch
0.08
317.5
0.09
282.25
0.1
254
0.125
203.25
0.15
169.25
0.175
145.25
0.2
127
0.225
113
0.25
101.5
0.3
84.75
0.35
72.5
0.4
63.5
0.45
56.5
0.5
50.75
0.6
42.25
0.7
36.25
0.75
33.75
0.8
31.75
0.9
25.25
1
25.5
1.25
20.25
1.5
17
1.75
14.25
2
12.75
2.5
10.25
3
8.5
3.5
7.25
4
6.25
5
5
5.5
4.5
6
4.25
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