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 | Twist drill |
| Point | — |
| Material | Cobalt alloy. Grade not stated by the FAA sources; H-31 p. 4-86 says 8 percent cobalt for titanium |
| Use for | Titanium and stainless steel, where HSS wears out quickly |
| Do not use for | Aluminium alloy: does not produce a quality hole |
A dash means the sources do not state it.
Sizes
The FAA sources give no sizes for this type; left blank. Rivet and bolt sizes are in the drill guide.
Where to buy
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Distributors coming soon.
Sources
- FAA-H-8083-31, AMT Handbook, Airframe, Volume 1 (rev. A) — pp. 4-17, 4-86
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.