System of Measurement System of Measurement |
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Decimal Size Equivalent Decimal Size Equivalent |
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For Use On For Use On |
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Bit Style Bit Style |
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| Spiral Flute | Multidiameter |
Shank Type Shank Type |
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| Round | Reduced Round |
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| Hex | Morse Taper |
Material Material |
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Length Class Length Class |
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Individual/Set Individual/Set |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Flute Direction Flute Direction |
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Morse Taper Number Morse Taper Number |
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Morse Taper Diameter Morse Taper Diameter |
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About Drill Bits
More
Drill Bit Decimal Size Equivalents
More
Extended-Length Drill Bits
Access hard-to-reach spots and drill deep holes.
Black-oxide drill bits produce less friction than uncoated drill bits.
Shank | ||||||||||
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| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Specifications Met | Each | |
Metric | ||||||||||
Black-Oxide High-Speed Steel | ||||||||||
| 20.0 mm | 0.7874" | 254mm | 156mm | Round | 20mm | Standard | Steel, Iron | DIN 340 | 000000000 | 000000 |
1/2" Diameter Reduced-Shank Drill Bits
The shank has a smaller diameter than the tip, allowing you to drill large holes with machines that have small-capacity chucks. Also known as Silver and Deming bits, they have a 1/2” diameter shank.
Drill bits with flats on shank have three flat sides to prevent the bit from slipping in the drill chuck.
Drill bits with a split point keep centered without a pilot hole.
Shank | |||||||||
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| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | For Use On | Point Style | Each | |
Drill Bits | |||||||||
Metric | |||||||||
Black-Oxide High-Speed Steel | |||||||||
| 20.0 mm | 0.7874" | 152mm | 53.3mm | Reduced Round | 1/2" | Steel, Iron, Stainless Steel | Standard | 0000000 | 000000 |
Drill Bits with Flats on Shank | |||||||||
Metric | |||||||||
Black and Gold Oxide High-Speed Steel | |||||||||
| 20.0 mm | 0.7874" | 152mm | 63.5mm | Reduced Round | 1/2" | Steel, Iron, Stainless Steel | Split | 0000000 | 00000 |
Cobalt Steel 1/2" Diameter Reduced-Shank Drill Bits
With better heat and wear resistance than high-speed steel, these cobalt steel bits can run up to 25% faster and have a longer tool life. The shank has a smaller diameter than the tip, allowing you to drill large holes with machines that have small-capacity chucks. A split point keeps the bit centered without a pilot hole. Also known as Silver and Deming bits, they have a 1/2” diameter shank.
Shank | |||||||||
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| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Metric | |||||||||
Uncoated Cobalt Steel | |||||||||
| 20.0 mm | 0.7874" | 152mm | 58mm | Reduced Round | 1/2" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 000000 |
High-Speed Steel Morse Taper-Shank Drill Bits
Install the Morse taper shank directly into the tapered spindle on machines such as drill presses and lathes.
For technical drawings and 3-D models, click on a part number.
Morse Taper | |||||||||||
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| Size | Decimal Size Equivalent | No. | Dia. | Overall Lg. | Max. Drilling Dp. | Shank Type | Point Style | Specifications Met | For Use On | Each | |
Metric | |||||||||||
Black-Oxide High-Speed Steel | |||||||||||
| 20.0 mm | 0.7874" | 2 | 0.7" | 238mm | 99.9mm | Morse Taper | Standard | DIN 345 | Steel, Iron, Stainless Steel | 00000000 | 000000 |
High-Speed Steel Multidiameter Drill Bits
Steps with progressively larger diameters let you drill a range of sizes with one bit. Also known as step drills.
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 drill bits and black-oxide drill bits.
Shank | ||||||||||
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| Size | Decimal Size Equivalent | No. of Sizes | Overall Lg. | For Max. Material Thick. | Type | Size | Point Style | For Use On | Each | |
Metric | ||||||||||
Black-Oxide High-Speed Steel | ||||||||||
| 4.0 mm, 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm | 0.1575", 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874" | 9 | 65mm | 2mm | Hex | 6.4mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Nickel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
| 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm, 22.0 mm, 24.0 mm, 26.0 mm, 28.0 mm, 30.0 mm, 32.0 mm, 35.0 mm | 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874", 0.8661", 0.9449", 1.0236", 1.1024", 1.1811", 1.2598", 1.378" | 15 | 89mm | 2mm | Hex | 6.4mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Nickel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
Titanium-Nitride (TiN) Coated High-Speed Steel | ||||||||||
| 4.0 mm, 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm, 22.0 mm | 0.1575", 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874", 0.8661" | 10 | 76mm | 5mm | Hex | 10mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
Uncoated High-Speed Steel | ||||||||||
| 4.0 mm, 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm, 22.0 mm | 0.1575", 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874", 0.8661" | 10 | 76mm | 5mm | Hex | 10mm | Standard | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm, 22.0 mm, 24.0 mm | 0.5512", 0.6299", 0.7087", 0.7874", 0.8661", 0.9449" | 6 | 64mm | 5mm | Hex | 11.1mm | Standard | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 20.0 mm, 22.0 mm, 24.0 mm, 26.0 mm, 28.0 mm, 30.0 mm, 32.0 mm, 34.0 mm | 0.7874", 0.8661", 0.9449", 1.0236", 1.1024", 1.1811", 1.2598", 1.3386" | 8 | 54mm | 5mm | Hex | 11.1mm | Standard | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |