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About Drill Bits
More
Drill Bit Decimal Size Equivalents
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Drill Bits
These jobbers'-length bits have the rigidity and length required for most applications.
Black-oxide and black-and-gold-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 oxide-coated drill bits.
Titanium-aluminum-nitride (TiAlN) coated drill bits are the most wear and temperature resistant for the longest life and highest drilling speeds.
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 | Pkg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | Pkg. Qty. | Pkg. | ||
Inch | |||||||||||||
Titanium-Aluminum-Nitride (TiAlN) Coated High-Speed Steel | |||||||||||||
| 1/4" | 0.25" | 4" | 2.37" | Round | 1/4" | Split | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000 | 00 | 12 | 0000000 | 000000 |
Uncoated High-Speed Steel | |||||||||||||
| 1/4" | 0.25" | 4" | 2.37" | Round | 1/4" | Standard | __ | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 000000 | 00 | 12 | 00000000 | 00000 |
Letter | |||||||||||||
Black-Oxide High-Speed Steel | |||||||||||||
| E | 0.25" | 4" | 2.37" | Round | 1/4" | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 00000 | 12 | 00000000 | 00000 |
Titanium-Nitride (TiN) Coated High-Speed Steel | |||||||||||||
| E | 0.25" | 4" | 2.37" | Round | 1/4" | Split | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 0000000 | 0000 | __ | 000000 | 00 |
Titanium-Aluminum-Nitride (TiAlN) Coated High-Speed Steel | |||||||||||||
| E | 0.25" | 4" | 2.37" | Round | 1/4" | Split | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 | __ | 000000 | 00 |
Uncoated High-Speed Steel | |||||||||||||
| E | 0.25" | 4" | 2.37" | Round | 1/4" | Standard | __ | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 | __ | 000000 | 00 |
Short-Length Drill Bits
Black-oxide drill bits produce less friction than uncoated 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Letter | ||||||||||
Black-Oxide High-Speed Steel | ||||||||||
| E | 0.25" | 2 1/2" | 0.87" | Round | 1/4" | Split | NAS907 Type C | Steel, Iron, Stainless Steel | 00000000 | 00000 |
Extended-Length Drill Bits
Black-oxide drill bits produce less friction than uncoated drill bits.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Letter | |||||||||
Black-Oxide High-Speed Steel | |||||||||
| E | 0.25" | 6 1/8" | 3.37" | Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 000000 |
Cobalt Steel 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Letter | ||||||||||
Uncoated Cobalt Steel | ||||||||||
| E | 0.25" | 4" | 2.37" | Round | 1/4" | Split | NAS907 Type J | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
Short-Length Cobalt Steel Drill Bits
Also known as screw-machine and stub-length bits, these provide maximum rigidity for drilling straighter holes than jobbers'-length drill bits. Made of cobalt steel, which has better heat and wear resistance than high-speed steel, they can run up to 25% faster and have a longer tool life.
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 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Letter | |||||||||
Uncoated Cobalt Steel | |||||||||
| E | 0.25" | 2 1/2" | 1" | Round | 1/4" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 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.
Shank | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Letter—Parabolic Spiral Flute | ||||||||||
Uncoated Cobalt Steel | ||||||||||
| A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z | __ | __ | __ | Round | __ | Split | DIN 338 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 000000 | 00 |
| E | 0.25" | 4" | 2.48" | Round | 1/4" | Split | DIN 338 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
Carbide Drill Bits
These jobbers'-length bits have the rigidity and length required for most applications. 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. The four-facet point keeps the bit centered without a pilot hole. These bits require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Letter | |||||||||
Uncoated Carbide | |||||||||
| E | 0.25" | 3 1/4" | 1.6" | Round | 1/4" | Four Facet | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 000000 |
Smooth-Finish Carbide Drill Bits
Three cutting edges instead of the typical two enable these bits to drill holes with a smoother finish than other bits. 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. A split point keeps the bit centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Shank Size | Point Style | For Use On | Each | |
Letter | |||||||||
Uncoated Carbide | |||||||||
| E | 0.25" | 3 1/4" | 1.6" | Round | 1/4" | Split | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
Drill Bits for Plastic
The sharp point allows for gradual penetration to reduce friction and eliminate cracking and chipping when drilling in plastic. These bits are jobbers' length and have the rigidity and length required for most applications.
For technical drawings and 3-D models, click on a part number.
Shank | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Each | |
Letter | ||||||||
Uncoated High-Speed Steel | ||||||||
| E | 0.25" | 4" | 2" | Round | 1/4" | Standard | 000000000 | 00000 |
Carbide Drill Bits for Hardened Steel
Harder, stronger, and more wear resistant than carbide-tipped steel, solid-carbide bits maintain their sharp edges longer. They require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications. The straight flutes withstand the heavy pressure necessary to penetrate hard steel. A four-facet or split point keeps the bit centered without a pilot hole. These bits are short length, also known as screw machine or stub length, which provides maximum rigidity for drilling straighter holes than jobbers'-length drill bits.
For technical drawings and 3-D models, click on a part number.
Shank | Uncoated Carbide | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | No. of Flutes | For Max. Hardness | Point Style | Each | |
Letter | ||||||||||
Carbide Shank | ||||||||||
| E | 0.25" | 2 1/2" | 0.8" | Round | 1/4" | 2 | Rockwell C45 | Four Facet | 00000000 | 000000 |
Drill Bits for Carbon Fiber, Fiberglass, and Graphite
These jobbers'-length bits have the rigidity and length required for most applications. They are designed to make clean holes in abrasive material. Their point keeps the bit centered without a pilot hole.
Uncoated drill bits have three drill points that make clean holes in fiber-reinforced composites without fraying or delaminating the material.
For technical drawings and 3-D models, click on a part number.
Shank | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Each | |
Letter | ||||||||
Uncoated Carbide | ||||||||
| E | 0.25" | 3 1/4" | 1.6" | Round | 1/4" | Brad | 00000000 | 000000 |