Drill Bit Decimal Size Equivalents
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About Drill Bits
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Carbide Hole-Starting Drill Bits
90° Point Angle
120° Point Angle
140° Point Angle
Harder, stronger, and more wear resistant than cobalt 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 short flute and length keep these bits straight for accurate placement when starting holes that will be drilled deeper with a longer bit. Also known as spotting drill bits.
Bits with a 90° point angle are for centering and chamfering holes that will be followed by a smaller drill bit size.
Bits with a 120° point angle are for starting a hole that will be followed by a drill bit with a point angle from 90° to 118°.
Bits with a 140° point angle are for starting a hole that will be followed by a drill bit with a point angle from 118° to 135°.
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 | |
90° Point Angle | |||||||||
Inch | |||||||||
Titanium Aluminum Nitride (TiAlN) Coated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 000000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 3/8" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
Titanium Nitride (TiN) Coated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 3/8" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
Uncoated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 0.38" | Round | 3/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 5/8" | 0.625" | 3 1/2" | 0.63" | Round | 5/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
Metric | |||||||||
Uncoated Carbide | |||||||||
| 3 mm | 0.1181" | 57mm | 3mm | Round | 3mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 5 mm | 0.1968" | 63mm | 5mm | Round | 5mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 6 mm | 0.2362" | 63mm | 6mm | Round | 6mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 8 mm | 0.315" | 63mm | 8mm | Round | 8mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 10 mm | 0.3937" | 70mm | 10mm | Round | 10mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
120° Point Angle | |||||||||
Inch | |||||||||
Titanium Aluminum Nitride (TiAlN) Coated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 3/8" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
Titanium Nitride (TiN) Coated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 3/8" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
Uncoated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 0.38" | Round | 3/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 5/8" | 0.625" | 3 1/2" | 0.63" | Round | 5/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
Metric | |||||||||
Titanium Nitride (TiN) Coated Carbide | |||||||||
| 8 mm | 0.315" | 63mm | 8mm | Round | 8mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 0000000 | 00000 |
Uncoated Carbide | |||||||||
| 3 mm | 0.1181" | 57mm | 3mm | Round | 3mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 5 mm | 0.1968" | 63mm | 5mm | Round | 5mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 6 mm | 0.2362" | 63mm | 6mm | Round | 6mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 10 mm | 0.3937" | 70mm | 10mm | Round | 10mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
140° Point Angle | |||||||||
Inch | |||||||||
Titanium Aluminum Nitride (TiAlN) Coated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 3/8" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
Titanium Nitride (TiN) Coated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 3/8" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Aluminum, Brass, Bronze, Fiberglass, Plastic | 00000000 | 00000 |
Uncoated Carbide | |||||||||
| 1/8" | 0.125" | 2" | 1/8" | Round | 1/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 3/16" | 0.1875" | 2" | 3/16" | Round | 3/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 5/16" | 0.3125" | 2 1/2" | 5/16" | Round | 5/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 3/8" | 0.375" | 2 1/2" | 0.38" | Round | 3/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 1/2" | 0.5" | 3" | 1/2" | Round | 1/2" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 5/8" | 0.625" | 3 1/2" | 0.63" | Round | 5/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
Metric | |||||||||
Uncoated Carbide | |||||||||
| 3 mm | 0.1181" | 57mm | 3mm | Round | 3mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 5 mm | 0.1968" | 63mm | 5mm | Round | 5mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 6 mm | 0.2362" | 63mm | 6mm | Round | 6mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
| 8 mm | 0.315" | 63mm | 8mm | Round | 8mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 00000 |
| 10 mm | 0.3937" | 70mm | 10mm | Round | 10mm | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |