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Drill Bit Decimal Size Equivalents
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About Drill Bits
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Carbide Hole-Starting Drill Bits
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°.
Shank | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
90° Point Angle | |||||||||
Inch | |||||||||
Uncoated Carbide | |||||||||
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 000000 |
| 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 | 00000 |
120° Point Angle | |||||||||
Inch | |||||||||
Uncoated Carbide | |||||||||
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 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 | 00000 |
140° Point Angle | |||||||||
Inch | |||||||||
Uncoated Carbide | |||||||||
| 1/4" | 0.25" | 2 1/2" | 1/4" | Round | 1/4" | Standard | Steel, Iron, Stainless Steel, Aluminum, Brass, Bronze, Plastic | 0000000 | 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 | 00000 |
Cobalt Steel Hole-Starting Drill Bits
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. Cobalt steel bits are heat resistant and maintain their sharp edges when drilling hard material. They are for use in both hand-held drilling and machine-tool applications.
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°.
Shank | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
90° Point Angle | |||||||||
Inch | |||||||||
Uncoated Cobalt Steel | |||||||||
| 1/4" | 0.25" | 2 5/8" | 0.89" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 000000 |
| 3/8" | 0.375" | 3 1/2" | 1" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 1/2" | 0.5" | 4" | 1.38" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 5/8" | 0.625" | 4 1/2" | 1.38" | Round | 5/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 3/4" | 0.75" | 5 1/8" | 1.63" | Round | 3/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
Metric | |||||||||
Uncoated Cobalt Steel | |||||||||
| 4.0 mm | 0.1575" | 52mm | 12.7mm | Round | 4mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 5.0 mm | 0.1968" | 60mm | 15mm | Round | 5mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
120° Point Angle | |||||||||
Inch | |||||||||
Uncoated Cobalt Steel | |||||||||
| 1/4" | 0.25" | 2 5/8" | 0.89" | Round | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 3/8" | 0.375" | 3 1/2" | 1" | Round | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 1/2" | 0.5" | 4" | 1.38" | Round | 1/2" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 5/8" | 0.625" | 4 1/2" | 1.38" | Round | 5/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 3/4" | 0.75" | 5 1/8" | 1.63" | Round | 3/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
Metric | |||||||||
Uncoated Cobalt Steel | |||||||||
| 4.0 mm | 0.1575" | 52mm | 12.7mm | Round | 4mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
| 5.0 mm | 0.1968" | 60mm | 15mm | Round | 5mm | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
Electrical Discharge Machining Tube Electrodes
Create very small holes, including pilot holes to run EDM wire through. For use in hole-popping EDM machines.
Also known as spark machining, electrical discharge machining (EDM) uses electrical current to erode a metal workpiece to a desired shape.
Brass electrodes can be used at a faster machining rate but wear out quicker than copper electrodes.
Copper electrodes last longer and are better for use on extremely hard materials, such as carbide, sintered diamond, and invar and kovar nickel alloys.
Electrodes with one channel are best for creating through holes.
Electrodes with two channels are best for creating closed-end holes. The internal channels disintegrate material left at the bottom of a closed-end hole.
| Number of Channels | Dia., mm | Dia. Decimal Equivalent | Lg., mm | Tolerance | For Use On | Pkg. Qty. | Pkg. | |
Brass | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1 | 0.5 | 0.02" | 400 | -0.0008" to 0.0000" | Hardened Steel, Nickel, Stainless Steel, Steel, Titanium, Tool Steel | 20 | 0000000 | 000000 |
| 1 | 1 | 0.039" | 400 | -0.0008" to 0.0000" | Hardened Steel, Nickel, Stainless Steel, Steel, Titanium, Tool Steel | 20 | 0000000 | 00000 |
| 2 | 0.5 | 0.02" | 400 | -0.0008" to 0.0000" | Hardened Steel, Nickel, Stainless Steel, Steel, Titanium, Tool Steel | 20 | 0000000 | 00000 |
| 2 | 1 | 0.039" | 400 | -0.0008" to 0.0000" | Hardened Steel, Nickel, Stainless Steel, Steel, Titanium, Tool Steel | 20 | 0000000 | 00000 |
Copper | ||||||||
| 1 | 0.5 | 0.02" | 400 | -0.0008" to 0.0000" | Carbide, Hardened Steel, Nickel, Sintered Diamond, Steel, Titanium, Tool Steel | 20 | 0000000 | 00000 |
| 1 | 1 | 0.039" | 400 | -0.0008" to 0.0000" | Carbide, Hardened Steel, Nickel, Sintered Diamond, Steel, Titanium, Tool Steel | 20 | 0000000 | 00000 |
| 2 | 0.5 | 0.02" | 300 | -0.0008" to 0.0000" | Carbide, Hardened Steel, Nickel, Sintered Diamond, Steel, Titanium, Tool Steel | 20 | 0000000 | 00000 |
| 2 | 1 | 0.039" | 400 | -0.0008" to 0.0000" | Carbide, Hardened Steel, Nickel, Sintered Diamond, Steel, Titanium, Tool Steel | 20 | 0000000 | 00000 |
Guides for Electrical Discharge Machining Tube Electrodes
Hold a tube electrode in place as it penetrates the workpiece.
Also known as spark machining, electrical discharge machining (EDM) uses electrical current to erode a metal workpiece to a desired shape.