# 7/16-14 tap drill size

The tap drill for a 7/16-14 UNC thread is a U drill (0.3680 in, 9.35 mm). It leaves about 75 % thread. The closest metric drill is 9.3 mm, which leaves 77 % thread.

## Drill options for 7/16-14 UNC

| Drill | Inch | Thread % |
|---|---|---|
| U | 0.3680 | 75 % |
| 9.2 mm | 0.3622 | 81 % |
| 9.3 mm | 0.3661 | 77 % |
| 9.4 mm | 0.3701 | 73 % |

## 7/16-14 thread data

- Thread: 7/16-14 UNC, 14 TPI
- Major diameter: 0.4375 in (11.11 mm)
- Tap drill: U = 0.3680 in (9.35 mm)
- Thread engagement: 75 %

## Method

Thread % = TPI × (D − drill) / 0.01299 = 14 × 0.0695 / 0.01299 = 75 %.

## FAQ

**What size drill for a 7/16-14 tap?**
Use a U drill (0.3680 in, 9.35 mm). It leaves about 75 % thread.

**Can I use a metric drill for 7/16-14?**
Yes. A 9.3 mm drill gives about 77 % thread.

**How tight should a 7/16 grade 5 bolt be?**
About 49 ft-lb dry for 7/16-14 UNC.

Source page: https://machinistcharts.com/tap-drill/7-16-14/
Updated: 2026-10-05
Publisher: MachinistCharts (https://machinistcharts.com)