Drill Bit Decimal Size Equivalents
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About Drill Bits
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Short-Length Drill Bits
Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'- and maintenance-length drill bits.
Black-oxide drill bits produce less friction than uncoated drill bits.
Titanium-nitride (TiN) coated drill bits last longer and can drill at higher speeds than uncoated and black-oxide drill bits.
Drill bits with a split point keep centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | Each | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Metric | ||||||||||
Black-Oxide High-Speed Steel | ||||||||||
| 6.8 mm | 0.2678" | 74mm | 20.4mm | Round | 6.8mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 00000000 | 00000 |
| 6.9 mm | 0.2717" | 74mm | 34mm | Round | 6.9mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 000000000 | 0000 |
| 7.0 mm | 0.2756" | 74mm | 19.9mm | Round | 7mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 00000000 | 0000 |
| 7.2 mm | 0.2835" | 74mm | 34mm | Round | 7.2mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 000000000 | 0000 |
| 7.5 mm | 0.2953" | 74mm | 18.9mm | Round | 7.5mm | Split | DIN 1897 | Steel, Iron, Stainless Steel | 00000000 | 0000 |
Titanium-Nitride (TiN) Coated High-Speed Steel | ||||||||||
| 6.8 mm | 0.2678" | 74mm | 17mm | Round | 6.8mm | Standard | DIN 1897 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 0000000 | 0000 |
| 7.5 mm | 0.2953" | 74mm | 18.7mm | Round | 7.5mm | Standard | DIN 1897 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 0000000 | 0000 |
Carbide Drill/Mill End Mills
Made of solid carbide, these end mills are harder, stronger, and more wear resistant than cobalt steel for the longest life and best finish on hard material. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the end mill from breaking. A 90° pointed tip allows them to be used for drilling as well as for slotting, profiling, and chamfering cuts. All are center cutting, allowing plunge cuts into a surface.
End mills with four flutes provide a finer finish and operate with less vibration when run at high speeds.
Use uncoated end mills for general purpose milling and short production runs.
| Mill Dia. | Shank Dia. | Lg. of Cut | Overall Lg. | Flute Spacing | Point Angle | Helix Angle | For Use On | End Mill Type | Each | |
Uncoated | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
4 Flute | ||||||||||
| 12mm | 12mm | 25mm | 74mm | Equal | 90° | 30° | Aluminum, Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | Center Cutting | 00000000 | 000000 |