Drill Bit Decimal Size Equivalents
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About Countersinks
Countersinks cut a cone-shaped opening to install screws and rivets flush with a surface or hold workpieces between centers on a lathe. They can also be used for chamfering and deburring.
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About Drill Bits
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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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 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 | |||||||||
| 1/8" | 0.125" | 2 1/2" | 0.75" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 000000 |
| 5/32" | 0.1563" | 2 5/8" | 0.87" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
| 11/64" | 0.1719" | 2 5/8" | 0.87" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
| 3/16" | 0.1875" | 2 5/8" | 1" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
| 13/64" | 0.2031" | 2 5/8" | 1" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
| 7/32" | 0.2188" | 2 5/8" | 1" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
| 1/4" | 0.25" | 3 1/8" | 1.31" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
| 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 | 000000 |
| 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 |
| 3/8" | 0.375" | 3 1/2" | 1.84" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 000000 |
| 1/2" | 0.5" | 4 1/4" | 2.31" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 000000 |
Carbide Drill Bit Sets
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 applications. All are jobbers’ length so they have the rigidity and length required for most applications. A four-facet point keeps the bit centered without a pilot hole.
Aluminum-titanium-nitride (AlTiN) coated drill bit sets are the most wear and temperature resistant for the longest life and highest drilling speeds.
For technical drawings and 3-D models, click on a part number.
| Number of Pieces | Drill Bit Sizes Included | Point Style | For Use On | Each | |
Inch | |||||
|---|---|---|---|---|---|
Aluminum-Titanium-Nitride (AlTiN) Coated Carbide | |||||
| 6 | 1/16"-3/8" (increments of 1/16") | Four Facet | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000000 |
Carbide Drill-Point Countersinks for Lathe Centers
Carbide is harder, stronger, and more wear resistant than cobalt steel and high-speed steel for better performance on hard and abrasive materials. These countersinks require rigid tool holding to prevent breakage and are not for use with hand-held tools. The 60° countersink angle is compatible with the profile of centers on a lathe. They have a small drill point on the tip for drilling and countersinking holes with the same tool. The drill point creates a small gap that prevents damage to the points of live or dead centers. Turn the countersink around for a sharp cutting edge when one end dulls.
AlTiN (aluminum titanium nitride) coated countersinks are for high-speed machining on materials with a Rockwell hardness up to C70. They are not for use on aluminum.
For technical drawings and 3-D models, click on a part number.
Dia. | 60° Countersink Angle | ||||||
|---|---|---|---|---|---|---|---|
| Countersink Trade Size | For Drill Bit Size | Body | Shank | Overall Lg. | For Use On | Each | |
Aluminum Titanium Nitride (AlTiN) Coated Carbide | |||||||
2 Flute | |||||||
| 00 | 0.025" | 1/8" | 1/8" | 1 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 |
| 0 | 1/32" | 1/8" | 1/8" | 1 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 |
| 1 | 3/64" | 1/8" | 1/8" | 1 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 |
| 2 | 5/64" | 3/16" | 3/16" | 2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 |
| 3 | 7/64" | 1/4" | 1/4" | 2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 |
| 4 | 1/8" | 5/16" | 5/16" | 2 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 |
| 5 | 3/16" | 7/16" | 7/16" | 2 3/4" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 |
| 6 | 7/32" | 1/2" | 1/2" | 3" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 |
| 7 | 1/4" | 5/8" | 5/8" | 3 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 |
| 8 | 5/16" | 3/4" | 3/4" | 4" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 |
Carbide Drill-Point Countersinks with Two Countersinking Ends for Screws
For excellent performance on hard and abrasive materials, these carbide countersinks are harder, stronger, and more wear resistant than cobalt steel and high-speed steel countersinks. They require rigid tool holding to prevent breakage and are not for use with hand-held tools. All have a small drill point on the tip for drilling and countersinking holes with the same tool. The drill point creates a small pilot hole at the bottom of the countersunk hole to facilitate drilling. An 82° countersink angle is compatible with the profile of flat- and oval-head inch screws; a 90° countersink angle is compatible with the profile of flat- and oval-head metric screws and is also good for deburring. When one end of the countersink dulls, turn it around for a sharp cutting edge.
AlTiN (aluminum titanium nitride) coated countersinks are for high-speed machining on materials with a Rockwell hardness up to C70. They are not for use on aluminum.
For technical drawings and 3-D models, click on a part number.
Dia. | 82° Countersink Angle | 90° Countersink Angle | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Countersink Trade Size | For Drill Bit Size | Body | Shank | Overall Lg. | For Use On | Each | Each | ||
Aluminum Titanium Nitride (AlTiN) Coated Carbide | |||||||||
2 Flute | |||||||||
| 00 | 0.025" | 1/8" | 1/8" | 1 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
| 0 | 1/32" | 1/8" | 1/8" | 1 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 | 00000000 | 00000 |
| 1 | 3/64" | 1/8" | 1/8" | 1 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 | 00000000 | 00000 |
| 2 | 5/64" | 3/16" | 3/16" | 2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 | 00000000 | 00000 |
| 3 | 7/64" | 1/4" | 1/4" | 2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 | 00000000 | 00000 |
| 4 | 1/8" | 5/16" | 5/16" | 2 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 | 00000000 | 00000 |
| 5 | 3/16" | 7/16" | 7/16" | 2 3/4" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 00000 | 00000000 | 00000 |
| 6 | 7/32" | 1/2" | 1/2" | 3" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
| 7 | 1/4" | 5/8" | 5/8" | 3 1/2" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
| 8 | 5/16" | 3/4" | 3/4" | 4" | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | 00000000 | 000000 | 00000000 | 000000 |
Carbide Drill-Point Countersink Sets for Lathe Centers
Carbide is harder, stronger, and more wear resistant than cobalt steel and high-speed steel for better performance on hard and abrasive materials. These countersinks require rigid tool holding to prevent breakage and are not for use with hand-held tools. The 60° countersink angle is compatible with the profile of centers on a lathe. They have a small drill point on the tip for drilling and countersinking holes with the same tool. The drill point creates a small gap that prevents damage to the points of live or dead centers. Turn the countersink around for a sharp cutting edge when one end dulls.
AlTiN (aluminum titanium nitride) coated countersinks are for high-speed machining on materials with a Rockwell hardness up to C70. They are not for use on aluminum.
For technical drawings and 3-D models, click on a part number.
60° Countersink Angle | |||||||
|---|---|---|---|---|---|---|---|
| Countersink Trade Size | Number of Pieces | Number of Countersinking Ends | Shank Type | For Use On | Container Type | Each | |
Aluminum Titanium Nitride (AlTiN) Coated Carbide | |||||||
| 1, 2, 3, 4, 5, 6 | 6 | 2 | Round | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | Metal Case | 00000000 | 0000000 |
Carbide Drill-Point Countersink Sets with Two Countersinking Ends for Screws
For excellent performance on hard and abrasive materials, carbide is harder, stronger, and more wear resistant than high-speed steel. The countersinks in these sets require rigid tool holding to prevent breakage and are not for use with hand-held tools. All have a small drill point on the tip for drilling and countersinking holes with the same tool. The drill point creates a small pilot hole at the bottom of the countersunk hole to facilitate drilling. An 82° countersink angle is compatible with the profile of flat- and oval-head inch screws; a 90° countersink angle is compatible with the profile of flat- and oval-head metric screws and is also good for deburring. When one end of the countersink dulls, turn it around for a sharp cutting edge.
AlTiN (aluminum titanium nitride) coated countersinks are for high-speed machining on materials with a Rockwell hardness up to C70. They are not for use on aluminum.
For technical drawings and 3-D models, click on a part number.
| Countersink Trade Size | Number of Pieces | Number of Countersinking Ends | Shank Type | For Use On | Container Type | Features | Each | |
82° Countersink Angle  | ||||||||
|---|---|---|---|---|---|---|---|---|
Aluminum Titanium Nitride (AlTiN) Coated Carbide | ||||||||
| 1, 2, 3, 4, 5, 6 | 6 | 2 | Round | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | Metal Case | Built-In Pilot | 00000000 | 0000000 |
90° Countersink Angle | ||||||||
Aluminum Titanium Nitride (AlTiN) Coated Carbide | ||||||||
| 1, 2, 3, 4, 5, 6 | 6 | 2 | Round | Brass, Bronze, Fiberglass, Hardened Steel, Iron, Nickel, Plastic, Stainless Steel, Steel, Titanium, Tool Steel | Metal Case | Built-In Pilot | 00000000 | 000000 |