---
type: "drill"
designation: "6 mm"
series: "metric"
series_name: "Metric Drill Sizes"
diameter_in: 0.23622
diameter_mm: 6
standard: "ANSI/ASME B94.11M; BS 328"
verified: "August 1, 2026"
url: https://shopmath.org/drills/metric/6mm
---

# 6 mm Drill Bit Size — 0.2362 in / 6.000 mm

A 6 mm drill bit is 0.2362 in (6.000 mm) in diameter. It belongs to the metric series of standard twist drills. It is the recommended tap drill for M7×1.

- **Designation**: 6 mm
- **Series**: Metric
- **Diameter**: 0.2362 in (6.000 mm)

## 6 mm Drill Diameter

| Property | Value |
| --- | --- |
| Designation | 6 mm |
| Series | Metric |
| Diameter (in) | 0.2362 |
| Diameter (mm) | 6.000 |

## 6 mm Drill Equivalents in the Other Size Series

The nearest standard drill to 6 mm in each of the other three series. Nothing here is an exact match unless the difference column reads 0.0000 in.

| Series | Nearest drill | Diameter (in) | Diameter (mm) | Difference |
| --- | --- | --- | --- | --- |
| Number | [#1](https://shopmath.org/drills/number/1.md) | 0.2280 | 5.791 | -0.0082 in |
| Letter | [B](https://shopmath.org/drills/letter/b.md) | 0.2380 | 6.045 | +0.0018 in |
| Fractional | [15/64](https://shopmath.org/drills/fractional/15-64.md) | 0.2344 | 5.953 | -0.0018 in |

## Threads Tapped With a 6 mm Drill

| Thread | Pitch | Thread engagement (%) |
| --- | --- | --- |
| [M7×1](https://shopmath.org/threads/metric-coarse/m7x1.md) | 1.000 mm | 77.0 |

_Engagement is what the real drill leaves with a cut tap, not the requested target._

## Sources and Method for the 6 mm Drill Size

### Drill index

- **Source**: Number/letter: bd_warehouse drill_sizes.csv (Apache-2.0) cross-checked against Wikipedia Drill bit sizes (CC BY-SA 4.0). Fractional: computed 1/64 in steps per ANSI B94.11M. Metric: computed BS 328 increment pattern.
- **Method**: computed
- **Verified against**: Wikipedia Drill bit sizes (CC BY-SA 4.0); 31/31 checks passed

### Assumptions

- Drill diameters are nominal. A worn or run-out drill cuts oversize; measure the hole, not the shank, when the fit matters.
- Dataset scope: Number sizes #61-#80 are stored but tagged demandTier 'extended' — query-space-map.md Appendix A found the tail thinning in the 60s. Sizes below #80 and metric sizes above 25.0 mm excluded.

**Data last verified**: August 1, 2026

## Common Questions About the 6 mm Drill Bit

### What size is a 6 mm drill bit size?

A 6 mm drill bit is 0.2362 in (6.000 mm) in diameter.

### What fraction is a 6 mm drill bit?

6 mm is 0.2362 in (6.000 mm), which is not itself a fractional size. The closest fractional drill is 15/64 at 0.2344 in (5.953 mm).

### What thread does a 6 mm drill bit tap?

A 6 mm drill is the recommended tap drill for M7×1. That leaves the thread engagement shown in the table above with a cut tap.

## Related pages

- Next size down (any series): [15/64](https://shopmath.org/drills/fractional/15-64.md) — 0.2344 in (5.953 mm)
- Next size up (any series): [B](https://shopmath.org/drills/letter/b.md) — 0.2380 in (6.045 mm)
- Previous in the metric series: [5.9 mm](https://shopmath.org/drills/metric/5-9mm.md)
- Next in the metric series: [6.1 mm](https://shopmath.org/drills/metric/6-1mm.md)
- All metric sizes: [Metric drill sizes](https://shopmath.org/drills/metric.md)
- All drill sizes: [Drill bit size reference](https://shopmath.org/drills.md)
- Complete index by diameter: [Drill size chart](https://shopmath.org/charts/drill-sizes.md)
- Tap drills by thread: [Tap drill chart](https://shopmath.org/charts/tap-drill.md)

---

*Source: [ShopMath](https://shopmath.org/drills/metric/6mm) — data verified August 1, 2026. Reference data; verify against the governing standard before manufacture.*