Metric Tap & Clearance Drill Sizes — M1.5 to M20
All dimensions in mm | Highlighted rows = coarse (standard) pitch| Screw Size | Thread Pitch (mm) | Tap Drill | Clearance Drill | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 75% Thread Aluminium, Brass & Plastics |
50% Thread Steel, Stainless & Iron |
Close Fit | Standard Fit | ||||||
| Drill (mm) | American | Drill (mm) | American | Drill (mm) | American | Drill (mm) | American | ||
| M1.5 | 0.35 | 1.15 | 56 | 1.25 | 55 | 1.60 | 1/16 | 1.65 | 52 |
| M1.6 | 0.35 | 1.25 | 55 | 1.35 | 54 | 1.70 | 51 | 1.75 | 50 |
| M1.8 | 0.35 | 1.45 | 53 | 1.55 | 1/16 | 1.90 | 49 | 2.00 | 5/64 |
| M2 | 0.45 | 1.55 | 1/16 | 1.70 | 51 | 2.10 | 45 | 2.20 | 44 |
| 0.40 | 1.60 | 52 | 1.75 | 50 | |||||
| M2.2 | 0.45 | 1.75 | 50 | 1.90 | 48 | 2.30 | 3/32 | 2.40 | 41 |
| M2.5 | 0.45 | 2.05 | 46 | 2.20 | 44 | 2.65 | 37 | 2.75 | 7/64 |
| M3 | 0.60 | 2.40 | 41 | 2.60 | 37 | 3.15 | 1/8 | 3.30 | 30 |
| 0.50 | 2.50 | 39 | 2.70 | 36 | |||||
| M3.5 | 0.60 | 2.90 | 32 | 3.10 | 31 | 3.70 | 27 | 3.85 | 24 |
| M4 | 0.75 | 3.25 | 30 | 3.50 | 28 | 4.20 | 19 | 4.40 | 17 |
| 0.70 | 3.30 | 30 | 3.50 | 28 | |||||
| M4.5 | 0.75 | 3.75 | 25 | 4.00 | 22 | 4.75 | 13 | 5.00 | 9 |
| M5 | 1.00 | 4.00 | 21 | 4.40 | 11/64 | 5.25 | 5 | 5.50 | 7/32 |
| 0.90 | 4.10 | 20 | 4.40 | 17 | |||||
| 0.80 | 4.20 | 19 | 4.50 | 16 | |||||
| M5.5 | 0.90 | 4.60 | 14 | 4.90 | 10 | 5.80 | 1 | 6.10 | B |
| M6 | 1.00 | 5.00 | 8 | 5.40 | 4 | 6.30 | E | 6.60 | G |
| 0.75 | 5.25 | 4 | 5.50 | 7/32 | |||||
| M7 | 1.00 | 6.00 | B | 6.40 | E | 7.40 | L | 7.70 | N |
| 0.75 | 6.25 | D | 6.50 | F | |||||
| M8 | 1.25 | 6.80 | H | 7.20 | J | 8.40 | Q | 8.80 | S |
| 1.00 | 7.00 | J | 7.40 | L | |||||
| M9 | 1.25 | 7.80 | N | 8.20 | P | 9.50 | 3/8 | 9.90 | 25/64 |
| 1.00 | 8.00 | O | 8.40 | 21/64 | |||||
| M10 | 1.50 | 8.50 | R | 9.00 | T | 10.50 | Z | 11.00 | 7/16 |
| 1.25 | 8.80 | 11/32 | 9.20 | 23/64 | |||||
| 1.00 | 9.00 | T | 9.40 | U | |||||
| M11 | 1.50 | 9.50 | 3/8 | 10.00 | X | 11.60 | 29/64 | 12.10 | 15/32 |
| M12 | 1.75 | 10.30 | 13/32 | 10.90 | 27/64 | 12.60 | 1/2 | 13.20 | 33/64 |
| 1.50 | 10.50 | Z | 11.00 | 7/16 | |||||
| 1.25 | 10.80 | 27/64 | 11.20 | 7/16 | |||||
| M14 | 2.00 | 12.10 | 15/32 | 12.70 | 1/2 | 14.75 | 37/64 | 15.50 | 39/64 |
| 1.50 | 12.50 | 1/2 | 13.00 | 33/64 | |||||
| 1.25 | 12.80 | 1/2 | 13.20 | 33/64 | |||||
| M15 | 1.50 | 13.50 | 17/32 | 14.00 | 35/64 | 15.75 | 5/8 | 16.50 | 21/32 |
| M16 | 2.00 | 14.00 | 35/64 | 14.75 | 37/64 | 16.75 | 21/32 | 17.50 | 11/16 |
| 1.50 | 14.50 | 37/64 | 15.00 | 19/32 | |||||
| M17 | 1.50 | 15.50 | 39/64 | 16.00 | 5/8 | 18.00 | 45/64 | 18.50 | 47/64 |
| M18 | 2.50 | 15.50 | 39/64 | 16.50 | 41/64 | 19.00 | 3/4 | 20.00 | 25/32 |
| 2.00 | 16.00 | 5/8 | 16.75 | 21/32 | |||||
| 1.50 | 16.50 | 21/32 | 17.00 | 43/64 | |||||
| M19 | 2.50 | 16.50 | 21/32 | 17.50 | 11/16 | 20.00 | 25/32 | 21.00 | 53/64 |
| M20 | 2.50 | 17.50 | 11/16 | 18.50 | 23/32 | 21.00 | 53/64 | 22.00 | 55/64 |
| 2.00 | 18.00 | 45/64 | 18.50 | 47/64 | |||||
| 1.50 | 18.50 | 47/64 | 19.00 | 3/4 | |||||