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.
The family
Where to buy| Type | Kind | In short |
|---|---|---|
| Brad point drill | Wood drill | Lip and spur: the spur centres, the corners cut the rim first |
| Bullet reamer | Reamer | Three or four flutes, production use |
| Carbide twist drill | Twist drill | Hard, abrasion-proof and brittle |
| Clothes pin or fish-tail point drill | Composite drill | Slices the fibres before pulling them out |
| Cobalt alloy drill | Twist drill | Thicker web, taper at the end of the shank |
| Diamond-coated drill | Twist drill | For hard, abrasive fibre |
| Diamond-coated hole saw | Large-hole cutter | For large holes in composite |
| Expansion reamer | Reamer | Named by the Handbook as expansive, not described further |
| Extension drill | Long drill | 6 to 12 in, spring-tempered shank, notched point |
| Flat flute or four-flute drill | Composite drill | Special drills for hard fibre |
| Fly cutter | Large-hole cutter | For large holes in composite, drill press only |
| Forstner bit | Wood drill | Precise, flat-bottomed bore |
| HSS drill, 118° point | Twist drill | The general point, 59° either side of centre |
| HSS drill, 135° split point | Twist drill | The standard twist drill for aluminium |
| HSS twist drill, jobber length | Twist drill | Two flutes, standard length |
| HSS twist drill, short shank | Twist drill | Two flutes, short shank for tight spots |
| Klenk drill | Composite drill | Sickle-shaped: pulls the fibre, then shears it |
| Piloted reamer | Reamer | End reduced for accurate alignment |
| Precision step drill | Step drill | Pilot nose plus a larger body |
| Step reamer | Reamer | Aligning step matches the core drill |
| Stepped cone drill (Unibit) | Step drill | Cuts 1/8 to 1/2 in by 1/32 in steps |
| Straight reamer | Reamer | Standard reamer, cuts at the end |
| Threaded shank drill | Twist drill | Screws into a right angle drill head |
| Three- and four-flute enlarging drill | Enlarging drill | Enlarges a hole, does not originate one |
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.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.