For Use On For Use On |
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Pipe Size Pipe Size |
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Thread Type Thread Type |
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Finish Finish |
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Material Material |
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Point Style Point Style |
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Standard |
System of Measurement System of Measurement |
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Overall Length Overall Length | Show |
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Overall Length Overall Length | Hide |
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Length Class Length Class |
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![]() | Jobbers' Length |
Bit Style Bit Style |
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![]() | Parabolic Spiral Flute |
Flute Direction Flute Direction |
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Right Hand |
Application Application |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Flute Type Flute Type |
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![]() | Spiral |
Individual/Set Individual/Set |
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Point Angle Point Angle |
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Drill Bit Decimal Size Equivalents
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About Drill Bits
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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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Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Wire Gauge—Parabolic Spiral Flute | |||||||||
Uncoated Carbide | |||||||||
21 ga | 0.159" | 3 5/16" | 1.93" | Round | 0.1591" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
20 ga | 0.161" | 3 5/16" | 1.92" | Round | 0.161" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
19 ga | 0.166" | 3 5/16" | 1.92" | Round | 0.1661" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
18 ga | 0.1695" | 3 5/16" | 1.91" | Round | 0.1693" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
Titanium-Nitride (TiN) Coated Carbide | |||||||||
21 ga | 0.159" | 3 5/16" | 1.93" | Round | 0.1591" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
20 ga | 0.161" | 3 5/16" | 1.92" | Round | 0.161" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
19 ga | 0.166" | 3 5/16" | 1.92" | Round | 0.1661" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
18 ga | 0.1695" | 3 5/16" | 1.91" | Round | 0.1693" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
Combination Drill Bit/Pipe and Conduit Thread Taps

Drill and thread holes for pipe and conduit without switching tools. Made of uncoated high-speed steel, these tools are for use on most metal and plastic. Their right-hand spiral flutes keep chips clear by drawing them back toward the tap and out of the hole. With a square shank, they're compatible with tap wrenches and tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping of through holes.
Drill Bit | Plug Chamfer | |||||||||
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Pipe Size | Thread Type | Threads Per Inch | Thread Lg. | Overall Lg. | Size | Decimal Size Equivalent | Point Angle | No. of Flutes | Each | |
Uncoated High-Speed Steel | ||||||||||
1/4 | NPTF | 18 | 1 1/16" | 3 5/16" | 7/16" | 0.4375" | 118° | 4 | 0000000 | 000000 |