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See Also
Wood Screw Sizes. Chart With Screw Number and DiameterScrew Measurement: How Screws Are MeasuredWhat do the numbers - such as 8-32 mean on a machine screw? - Westlake Ace HardwareUnderstanding Inch Fasteners - Fastener MartIMPERIAL VS METRIC NUT THREAD PITCH
| Body Size Metric | Metric Distance Between Threads | Decimal Distance Between Threads | Threads per Inch Metric Screws | Decimal Body Size Metric | Nearest Imperial Equivalent Body Size | Decimal Body Size Imperial | Nearest Imperial Equivalent Size | Threads per Inch Imperial Screws | |
| M2.5 | - | 0.45 | 0.01772 | 56.4 | 0.0984 | #3 | 0.0990 | 3-56 | 56 |
| M3 | - | 0.50 | 0.01969 | 50.8 | 0.1181 | #4 | 0.1113 | 4-48 | 48 |
| M3.5 | - | 0.60 | 0.02362 | 42.3 | 0.1378 | #6 | 0.1380 | 6-40 | 40 |
| M4 | - | 0.70 | 0.02756 | 36.3 | 0.1575 | #8 | 0.1640 | 8-36 | 36 |
| M5 | - | 0.80 | 0.03150 | 31.8 | 0.1969 | #10 | 0.1900 | 10-32 | 32 |
| M6 | - | 1.00 | 0.03937 | 25.4 | 0.2362 | 1/4 | 0.2500 | 1/4-28 | 28 |
| M8 | - | 1.25 | 0.04921 | 20.3 | 0.3150 | 5/16 | 0.3125 | 5/16-18 | 18 |
| M10 | - | 1.50 | 0.05906 | 16.9 | 0.3937 | 3/8 | 0.3750 | 3/8-16 | 16 |
Recommended Metric and ImperialDrill Sizes for Clearance Holes
| Metric Screw Size | Recommended Hole Size for Clearance | Recommended Drill Size | ||
| Metric Drill Size | Decimal Equivalent | Imperial Drill Size | Decimal Equivalent | |
| M3 | 3.2mm | 0.1260 | 1/8 | 0.1285 |
| M4 | 4.3mm | 0.1693 | 11/64 | 0.1710 |
| M5 | 5.3mm | 0.2087 | 13/64 | 0.2030 |
| M6 | 6.4mm | 0.2520 | 1/4 | 0.2500 |
| M8 | 8.4mm | 0.3307 | 3/8 | 0.3750 |
| M10 | 10.5mm | 0.4134 | 7/16 | 0.4370 |
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