System of Measurement System of Measurement |
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Drill Bit Size Drill Bit Size |
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Length Class Length Class |
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| Jobbers' Length |
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| Maintenance Length |
Finish Finish |
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Material Material |
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For Use On For Use On |
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Flute Direction Flute Direction |
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| Right Hand |
Bit Style Bit Style |
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 | Spiral Flute |
 | Parabolic Spiral Flute |
 | Straight Flute |
Decimal Size Equivalent Decimal Size Equivalent |
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Individual/Set Individual/Set |
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Maximum Drilling Depth Maximum Drilling Depth | Show |
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Maximum Drilling Depth Maximum Drilling Depth | Hide |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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For Maximum Hardness For Maximum Hardness |
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Drill Bit Decimal Size Equivalents
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About Drill Bits
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Maintenance-Length Drill Bits
Also known as mechanics’ bits, these are shorter and more rigid than jobbers' bits but longer than short‐length bits. A split point keeps the bit centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | Each | ||||||||
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| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Inch | |||||||||
Black-and-Gold-Oxide High-Speed Steel | |||||||||
| 9/64" | 0.1406" | 2 5/8" | 1.56" | Round | 9/64" | Split | Steel, Iron, Stainless Steel | 000000000 | 00000 |
Chip-Clearing Cobalt Steel Drill Bits
The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow. 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. All are jobbers’ length so they have the rigidity and length required for most applications. A split point keeps the bit centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
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| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Wire Gauge—Parabolic Spiral Flute | |||||||||
Uncoated Cobalt Steel | |||||||||
| 25 ga. | 0.1495" | 3" | 1.56" | Round | 0.1495" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 24 ga. | 0.152" | 3" | 1.56" | Round | 0.152" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
| 23 ga. | 0.154" | 3" | 1.56" | Round | 0.154" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
| 22 ga. | 0.157" | 3" | 1.56" | Round | 0.157" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
| 21 ga. | 0.159" | 3" | 1.56" | Round | 0.159" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
| 20 ga. | 0.161" | 3" | 1.56" | Round | 0.161" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
| 19 ga. | 0.166" | 3" | 1.56" | Round | 0.166" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
Carbide Drill Bits for Precise Holes
Specially-designed flutes keep these bits centered as they drill, resulting in straighter, rounder holes with tighter tolerances. Made of solid carbide for the highest accuracy and longest tool life, they are harder, stronger, and more wear resistant than high-speed steel, cobalt steel, and carbide-tipped bits. They retain a sharp, hard edge at high temperatures for the best performance on hard and abrasive material. These bits require rigid toolholding to prevent breakage and should not be used in hand-held drilling. All are jobbers’ length so they have the rigidity and length required for most applications. An aluminum titanium nitride (AlTiN) coating gives them additional wear and temperature resistance. Also known as double-margin drill bits.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
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| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Inch | |||||||||
Aluminum-Titanium-Nitride (AlTiN) Coated Carbide | |||||||||
| 9/32" | 0.2813" | 3 1/8" | 1.56" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000000 |
| 5/16" | 0.3125" | 3 1/8" | 1.56" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 000000 |
Chip-Clearing Carbide Drill Bits
The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow. For the highest accuracy and longest tool life, these solid-carbide bits are harder, stronger, and more wear resistant than high-speed steel, cobalt steel, and carbide-tipped bits. They retain a sharp, hard edge at high temperatures for the best performance on hard and abrasive material. These bits require rigid toolholding to prevent breakage and should not be used in hand-held drilling. All are jobbers’ length so they have the rigidity and length required for most applications.
Titanium-nitride (TiN) coated drill bits last longer and can drill at higher speeds than uncoated drill bits.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
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| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Inch—Parabolic Spiral Flute | |||||||||
Uncoated Carbide | |||||||||
| 9/64" | 0.1406" | 2 29/32" | 1.56" | Round | 9/64" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
Titanium-Nitride (TiN) Coated Carbide | |||||||||
| 9/64" | 0.1406" | 2 29/32" | 1.56" | Round | 9/64" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
Wire Gauge—Parabolic Spiral Flute | |||||||||
Uncoated Carbide | |||||||||
| 29 ga. | 0.136" | 2 29/32" | 1.56" | Round | 0.1358" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 28 ga. | 0.1405" | 2 29/32" | 1.56" | Round | 0.1406" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
Titanium-Nitride (TiN) Coated Carbide | |||||||||
| 29 ga. | 0.136" | 2 29/32" | 1.56" | Round | 0.1358" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
| 28 ga. | 0.1405" | 2 29/32" | 1.56" | Round | 0.1406" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
Cobalt Steel Hex-Shank Drill Bits
In addition to resisting heat and wear better than high-speed steel drill bits, these can also run up to 25% faster and have a longer tool life. Insert them into power screwdrivers, impact drivers, and other tools that accept hex shanks. The flat surfaces on the hex shank allow tool chucks to grip these bits more securely than those with a round shank. A split point keeps the bits centered without a pilot hole.
Shank | |||||||||
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| Drill Bit Size | Decimal Size Equivalent | Overall Length | Maximum Drilling Depth | Type | Size | Point Style | For Use On | Each | |
Uncoated Cobalt Steel | |||||||||
| 25/64" | 0.3906" | 5 1/8" | 1.56" | Hex | 25/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 000000 |
Carbide-Tipped Drill Bits for Hardened Steel
The straight flutes and notched point withstand the heavy pressure necessary to penetrate hard steel. These carbide-tipped bits maintain their sharp edges when drilling abrasive material. Because they aren’t as brittle as solid carbide bits, they can be used in less rigid setups, such as a hand-held drill. They are jobbers' length and have the rigidity and length required for most hand-held drilling and machine tool applications.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
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| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Max. Hardness | Each | |
Inch | |||||||||
Uncoated Carbide-Tipped Steel | |||||||||
| 25/64" | 0.3906" | 5 1/4" | 1.56" | Round | 25/64" | Notched | Rockwell C60 | 0000000 | 000000 |