Threads / Series directory
Metric coarse
thread sizes.
20 distinct nominal diameter–pitch combinations. Open a size for its differences and exact next steps.
Choose the complete designation
14 of 20 sizes have a matching reviewed drill-chart row. Other sizes provide an equation estimate with no rounded drill recommendation.
Swipe to see all columns →
| Designation | Major Ø · in / mm | TPI | Pitch · mm | Drill evidence | Next step |
|---|---|---|---|---|---|
| M1.6x0.35 Metric coarse | 0.062992 / 1.6 | 72.571429 converted | 0.35 | Chart row | Tap-drill lookup → |
| M2x0.4 Metric coarse | 0.07874 / 2 | 63.5 converted | 0.4 | Chart row | Tap-drill lookup → |
| M2.5x0.45 Metric coarse | 0.098425 / 2.5 | 56.444444 converted | 0.45 | Chart row | Tap-drill lookup → |
| M3x0.5 Metric coarse | 0.11811 / 3 | 50.8 converted | 0.5 | Chart row | Tap-drill lookup → |
| M4x0.7 Metric coarse | 0.15748 / 4 | 36.285714 converted | 0.7 | Chart row | Tap-drill lookup → |
| M5x0.8 Metric coarse | 0.19685 / 5 | 31.75 converted | 0.8 | Chart row | Tap-drill lookup → |
| M6x1 Metric coarse | 0.23622 / 6 | 25.4 converted | 1 | Chart row | Tap-drill lookup → |
| M8x1.25 Metric coarse | 0.314961 / 8 | 20.32 converted | 1.25 | Chart row | Tap-drill lookup → |
| M10x1.5 Metric coarse | 0.393701 / 10 | 16.933333 converted | 1.5 | Chart row | Tap-drill lookup → |
| M12x1.75 Metric coarse | 0.472441 / 12 | 14.514286 converted | 1.75 | Chart row | Tap-drill lookup → |
| M14x2 Metric coarse | 0.551181 / 14 | 12.7 converted | 2 | Chart row | Tap-drill lookup → |
| M16x2 Metric coarse | 0.629921 / 16 | 12.7 converted | 2 | Chart row | Tap-drill lookup → |
| M20x2.5 Metric coarse | 0.787402 / 20 | 10.16 converted | 2.5 | Chart row | Tap-drill lookup → |
| M24x3 Metric coarse | 0.944882 / 24 | 8.466667 converted | 3 | Chart row | Tap-drill lookup → |
| M30x3.5 Metric coarse | 1.181102 / 30 | 7.257143 converted | 3.5 | Equation only | Tap-drill lookup → |
| M36x4 Metric coarse | 1.417323 / 36 | 6.35 converted | 4 | Equation only | Tap-drill lookup → |
| M42x4.5 Metric coarse | 1.653543 / 42 | 5.644444 converted | 4.5 | Equation only | Tap-drill lookup → |
| M48x5 Metric coarse | 1.889764 / 48 | 5.08 converted | 5 | Equation only | Tap-drill lookup → |
| M56x5.5 Metric coarse | 2.204724 / 56 | 4.618182 converted | 5.5 | Equation only | Tap-drill lookup → |
| M64x6 Metric coarse | 2.519685 / 64 | 4.233333 converted | 6 | Equation only | Tap-drill lookup → |
Before treating a size as a match
Confirm pitch, thread profile and complete drawing requirements. A nominal diameter match does not establish mating compatibility.
Read the designation and class →