# M6x0.75 tap drill size

The tap drill for an M6 × 0.75 metric fine thread is 5.2 mm (0.2047 in). It leaves about 82 % thread, the normal range for steel.

## Drill options for M6 × 0.75

| Drill | Inch | Thread % |
|---|---|---|
| 5.1 mm | 0.2008 | 92 % |
| 5.2 mm | 0.2047 | 82 % |
| 5.3 mm | 0.2087 | 72 % |
| 5.4 mm | 0.2126 | 62 % |

## M6x0.75 thread data

- Thread: M6 × 0.75 (fine)
- Pitch: 0.75 mm
- Tap drill: 5.2 mm (0.2047 in)
- Thread engagement: 82 %
- Clearance hole (ISO 273): 6.4 close, 6.6 normal, 7 loose (mm)

## Method

Thread % = 76.98 × (D − drill) / P = 76.98 × 0.8 / 0.75 = 82 %. Aim for 65–75 % in steel, 75–85 % in aluminium, brass and plastics.

## FAQ

**What size drill for an M6 × 0.75 tap?**
Use a 5.2 mm drill. It leaves about 82 % thread engagement.

**What is 5.2 mm in inches?**
5.2 mm is 0.2047 inch.

**What size clearance hole for M6?**
ISO 273 gives 6.4 mm for a close fit, 6.6 mm normal and 7 mm loose.

**How tight should an M6 bolt be?**
About 11 N·m for class 8.8 with dry threads.

Source page: https://machinistcharts.com/tap-drill/m6x0-75/
Updated: 2026-10-05
Publisher: MachinistCharts (https://machinistcharts.com)