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Conversion & Reference Tables

Inch Fractions to Millimetres

Conversion and reference tables to use alongside the thread charts.

Sizes listed
128

Fraction InchDecimal Fraction InchSize mm
1/1280.00781250.198
3/1280.02343750.595
5/1280.03906250.992
7/1280.05468751.389
9/1280.07031251.786
11/1280.08593752.183
13/1280.10156252.580
15/1280.11718752.977
17/1280.13281253.373
19/1280.14843753.770
21/1280.16406254.167
23/1280.17968754.564
25/1280.19531254.961
27/1280.21093755.358
29/1280.22656255.755
31/1280.24218756.152
33/1280.25781256.548
35/1280.27343756.945
37/1280.28906257.342
39/1280.30468757.739
41/1280.32031258.136
43/1280.33593758.533
45/1280.35156258.930
47/1280.36718759.327
49/1280.38281259.723
51/1280.398437510.120
53/1280.414062510.517
55/1280.429687510.914
57/1280.445312511.311
59/1280.460937511.708
61/1280.476562512.105
63/1280.492187512.502
65/1280.507812512.898
67/1280.523437513.494
69/1280.539062513.692
71/1280.554687514.089
73/1280.570312514.486
75/1280.585937514.882
77/1280.601562515.280
79/1280.617187515.677
81/1280.632812516.073
83/1280.648437516.470
85/1280.664062516.867
87/1280.679687517.264
89/1280.695312517.661
91/1280.710937518.058
93/1280.726562518.455
95/1280.742187518.852
97/1280.757812519.248
99/1280.773437519.645
101/1280.789062520.042
103/1280.804687520.439
105/1280.820312520.836
107/1280.835937521.233
109/1280.851562521.630
111/1280.867187522.027
113/1280.882812522.423
115/1280.898437522.820
117/1280.914062523.416
119/1280.929687523.614
121/1280.945312524.011
123/1280.960937524.408
125/1280.976562524.805
127/1280.992187525.202
1/640.0156250.397
3/640.0468751.191
5/640.0781251.984
7/640.1093752.778
9/640.1406253.572
11/640.1718754.366
13/640.2031255.159
15/640.2343755.953
17/640.2656256.747
19/640.2968757.541
21/640.3281258.334
23/640.3593759.128
25/640.3906259.922
27/640.42187510.716
29/640.45312511.509
31/640.48437512.303
33/640.51562513.097
35/640.54687513.891
37/640.57812514.684
39/640.60937515.478
41/640.64062516.272
43/640.67187517.066
45/640.70312517.859
47/640.73437518.653
49/640.76562519.447
51/640.79687520.241
53/640.82812521.034
55/640.85937521.828
57/640.89062522.622
59/640.92187523.416
61/640.95312524.209
63/640.98437525.003
1/320.0312500.794
3/320.0937502.381
5/320.1562503.969
7/320.2187505.556
9/320.2812507.144
11/320.3437508.731
13/320.40625010.319
15/320.46875011.906
17/320.53125013.494
19/320.59375015.081
21/320.65625016.669
23/320.71875018.256
25/320.78125019.844
27/320.84375021.431
29/320.90625023.019
31/320.96875024.606
1/160.0625001.588
3/160.1875004.763
5/160.3125007.938
7/160.43750011.113
9/160.56250014.288
11/160.68750017.463
13/160.81250020.638
15/160.93750023.813
1/80.1250003.175
3/80.3750009.525
5/80.62500015.875
7/80.87500022.225
1/40.2500006.350
3/40.75000019.050
1/20.50000012.700
11.00000025.400
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Related Standards

TPI to Pitch (mm) Conversion 66 rows Number & Letter Drill Sizes ANSI B94.11M 170 rows Thread Designations & Abbreviations 33 rows

Reference values only. Verify against the current edition of the governing standard before use in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.