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 | Acrylic windows; wood, plastic and very thin sheet; deburring |
| Do not use for | — |
A dash means the sources do not state it.
Sizes
| Size | For | Inches (official) | mm (converted, not official) |
|---|---|---|---|
| Smallest | Hole | 1/8 in | 3.175 |
| Largest | Hole | 1/2 in | 12.700 |
| Step | Between diameters | 1/32 in | 0.794 |
Exact mm = inches × 25.4.
Where to buy
AmericaDistributor coming soonOur partner for this region is on its way
EuropeDistributor coming soonOur partner for this region is on its way
OceaniaDistributor coming soonOur partner for this region is on its way
Distributors coming soon.
Sources
- FAA AC 43.13-1B CHG 1 — par. 3-23
- FAA-H-8083-31, AMT Handbook, Airframe, Volume 1 (rev. A) — p. 4-17
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.