Inch values are official. Aviation is designed and worked in inches. Millimetres are converted and are not official; where one is shown, the metric drill is the nearest alternative, not the official drill.
Specification
Where to buy| Item | Value |
|---|---|
| Type | Step drill |
| Point | — |
| Material | — |
| Use for | Large holes: aligns in the pilot and cuts close to final size in one pass |
| Do not use for | — |
A dash means the sources do not state it.
Sizes
| Size | For | Inches (official) | mm (converted, not official) |
|---|---|---|---|
| Left under final | About this under final size | 1/64 in | 0.397 |
Exact mm = inches × 25.4.
Where to buy
AmericaDistributor coming soonOur partner for this region is on its way
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OceaniaDistributor coming soonOur partner for this region is on its way
Distributors coming soon.
Sources
- FAA-H-8083-31, AMT Handbook, Airframe, Volume 1 (rev. A) — pp. 4-17, 4-20
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.