Drill Bit Decimal Size Equivalents
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About Drill Bits
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Maintenance-Length Drill Bits
Also known as mechanics’ bits, these are shorter and more rigid than jobbers' bits but longer than short‐length bits. A split point keeps the bit centered without a pilot hole.
Drill bits with flats on shank have three flat sides to prevent the bit from slipping in the drill chuck.
For technical drawings and 3-D models, click on a part number.
Shank | Each | Pkg. | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Features | For Use On | Each | Pkg. Qty. | Pkg. | ||
Inch | |||||||||||||
Black-and-Gold-Oxide High-Speed Steel | |||||||||||||
1/16" | 0.0625" | 1 7/8" | 0.88" | Round | 1/16" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 00000 | __ | 000000 | 00 |
5/64" | 0.0781" | 2" | 1" | Round | 5/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
3/32" | 0.0938" | 2 1/4" | 1.25" | Round | 3/32" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
7/64" | 0.1094" | 2 3/8" | 1.31" | Round | 7/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
1/8" | 0.125" | 2 1/2" | 1.44" | Round | 1/8" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
9/64" | 0.1406" | 2 5/8" | 1.56" | Round | 9/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
5/32" | 0.1563" | 2 3/4" | 1.69" | Round | 5/32" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
11/64" | 0.1719" | 2 7/8" | 1.81" | Round | 11/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
3/16" | 0.1875" | 3" | 1.75" | Round | 3/16" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 0000000 | 000000 |
13/64" | 0.2031" | 3 1/8" | 1.81" | Round | 13/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
7/32" | 0.2188" | 3 1/4" | 1.87" | Round | 7/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
15/64" | 0.2344" | 3 3/8" | 1.93" | Round | 15/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
1/4" | 0.25" | 3 1/2" | 1.87" | Round | 1/4" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
17/64" | 0.2656" | 3 5/8" | 2" | Round | 17/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
9/32" | 0.2813" | 3 3/4" | 2.18" | Round | 9/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
19/64" | 0.2969" | 3 7/8" | 2.34" | Round | 19/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | __ | 000000 | 00 |
5/16" | 0.3125" | 4" | 2.46" | Round | 5/16" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
21/64" | 0.3281" | 4 1/8" | 2.48" | Round | 21/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
11/32" | 0.3438" | 4 1/8" | 2.5" | Round | 11/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
23/64" | 0.3594" | 4 1/4" | 2.56" | Round | 23/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
3/8" | 0.375" | 4 1/4" | 2.56" | Round | 3/8" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
25/64" | 0.3906" | 4 3/8" | 2.62" | Round | 25/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
13/32" | 0.4063" | 4 3/8" | 2.68" | Round | 13/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
27/64" | 0.4219" | 4 1/2" | 2.75" | Round | 27/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
7/16" | 0.4375" | 4 1/2" | 2.81" | Round | 7/16" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | 6 | 00000000 | 00000 |
29/64" | 0.4531" | 4 5/8" | 2.87" | Round | 29/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
15/32" | 0.4688" | 4 3/4" | 3" | Round | 15/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
31/64" | 0.4844" | 4 7/8" | 3.21" | Round | 31/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
1/2" | 0.5" | 5" | 3.34" | Round | 1/2" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | 6 | 00000000 | 00000 |
Carbide Drill Bits with Coolant Holes
Holes in these bits allow coolant to be run through the tool for more efficient chip evacuation. Use them in CNC machines with coolant-through technology. 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. A titanium aluminum nitride (TiAlN) coating gives them additional wear and temperature resistance. 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.
Jobbers'-length drill bits have the rigidity and length required for most applications.
Maintenance-length drill bits are shorter and more rigid than jobbers'-length bits but longer than short-length bits. They hold up better than jobbers' bits when drilling in hard metal. Also known as mechanics' 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 | No. of Coolant Holes | For Use On | Each | |
Inch—Maintenance Length | ||||||||||
Titanium-Aluminum-Nitride (TiAlN) Coated Carbide | ||||||||||
1/8" | 0.125" | 1 15/16" | 0.69" | Round | 1/8" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 000000 |
9/64" | 0.1406" | 2 1/16" | 0.75" | Round | 9/64" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
5/32" | 0.1563" | 2 3/16" | 0.81" | Round | 5/32" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
11/64" | 0.1719" | 2 9/32" | 0.94" | Round | 11/64" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
3/16" | 0.1875" | 2 13/32" | 1" | Round | 3/16" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
13/64" | 0.2031" | 2 13/32" | 1" | Round | 13/64" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
7/32" | 0.2188" | 2 5/8" | 1.09" | Round | 7/32" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
1/4" | 0.25" | 2 3/4" | 1.22" | Round | 1/4" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
17/64" | 0.2656" | 2 15/16" | 1.34" | Round | 17/64" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
9/32" | 0.2813" | 2 15/16" | 1.34" | Round | 9/32" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
5/16" | 0.3125" | 3 3/32" | 1.47" | Round | 5/16" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
3/8" | 0.375" | 3 1/2" | 1.69" | Round | 3/8" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 000000 |
7/16" | 0.4375" | 3 3/4" | 1.81" | Round | 7/16" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 000000 |
1/2" | 0.5" | 4" | 1.94" | Round | 1/2" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 000000 |
Metric—Maintenance Length | ||||||||||
Titanium-Aluminum-Nitride (TiAlN) Coated Carbide | ||||||||||
3.0 mm | 0.1181" | 64mm | 20.1mm | Round | 6mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
4.0 mm | 0.1575" | 67mm | 23.9mm | Round | 6mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
5.0 mm | 0.1969" | 67mm | 27.9mm | Round | 6mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
6.0 mm | 0.2362" | 67mm | 27.9mm | Round | 6mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
7.0 mm | 0.2756" | 79mm | 34mm | Round | 8mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
7.5 mm | 0.2953" | 79mm | 40.9mm | Round | 8mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
8.0 mm | 0.315" | 79mm | 40.9mm | Round | 8mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 00000 |
8.5 mm | 0.3346" | 89mm | 47mm | Round | 10mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 000000 |
9.0 mm | 0.3543" | 89mm | 47mm | Round | 10mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 000000 |
9.5 mm | 0.374" | 89mm | 88.9mm | Round | 10mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 000000 |
10.0 mm | 0.3937" | 89mm | 47mm | Round | 10mm | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 000000 |
Cobalt Steel Left-Hand Drill Bits
With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life. Also known as reverse-flute bits, the flutes spiral in the opposite direction of other bits. Use in counterclockwise drilling applications such as removing broken screws. These bits are maintenance length, also known as mechanics’ length. They are shorter and more rigid than jobbers’ bits but longer than short-length bits. The split point keeps the bit centered without a pilot hole.
Titanium-nitride (TiN) coated drill bits last longer and can drill at higher speeds than uncoated drill bits.
Titanium-aluminum-nitride (TiAlN) coated drill bits 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.
Shank | |||||||||
---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Inch | |||||||||
Uncoated Cobalt Steel | |||||||||
5/64" | 0.0781" | 2" | 0.88" | Round | 5/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
7/64" | 0.1094" | 2 1/4" | 0.84" | Round | 7/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
1/8" | 0.125" | 2 1/4" | 1.06" | Round | 1/8" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
5/32" | 0.1563" | 2 5/8" | 1.27" | Round | 5/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
3/16" | 0.1875" | 2 7/8" | 1.34" | Round | 3/16" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
7/32" | 0.2188" | 3 1/8" | 1.42" | Round | 7/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
1/4" | 0.25" | 3 3/8" | 1.63" | Round | 1/4" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
9/32" | 0.2813" | 3 5/8" | 1.7" | Round | 9/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
19/64" | 0.2969" | 3 5/8" | 1.87" | Round | 19/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
5/16" | 0.3125" | 3 3/4" | 1.97" | Round | 5/16" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 0000 |
11/32" | 0.3438" | 4" | 1.98" | Round | 11/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
3/8" | 0.375" | 4 1/8" | 2.06" | Round | 3/8" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
13/32" | 0.4063" | 4 3/8" | 2.14" | Round | 13/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
7/16" | 0.4375" | 4 5/8" | 2.22" | Round | 7/16" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
15/32" | 0.4688" | 4 3/4" | 2.23" | Round | 15/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
1/2" | 0.5" | 5" | 2.31" | Round | 1/2" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
Titanium-Nitride (TiN) Coated Cobalt Steel | |||||||||
5/64" | 0.0781" | 2" | 0.88" | Round | 5/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 0000 |
7/64" | 0.1094" | 2 1/4" | 0.84" | Round | 7/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 0000 |
1/8" | 0.125" | 2 1/4" | 1.06" | Round | 1/8" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 0000 |
5/32" | 0.1563" | 2 5/8" | 1.27" | Round | 5/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 0000 |
3/16" | 0.1875" | 2 7/8" | 1.34" | Round | 3/16" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 0000 |
7/32" | 0.2188" | 3 1/8" | 1.42" | Round | 7/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 0000 |
1/4" | 0.25" | 3 3/8" | 1.63" | Round | 1/4" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 0000 |
5/16" | 0.3125" | 3 3/4" | 1.97" | Round | 5/16" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 00000 |
3/8" | 0.375" | 4 1/8" | 2.06" | Round | 3/8" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Fiberglass | 0000000 | 00000 |
Titanium-Aluminum-Nitride (TiAlN) Coated Cobalt Steel | |||||||||
5/64" | 0.0781" | 2" | 0.88" | Round | 5/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 |
7/64" | 0.1094" | 2 1/4" | 0.84" | Round | 7/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 |
1/8" | 0.125" | 2 1/4" | 1.06" | Round | 1/8" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 |
5/32" | 0.1563" | 2 5/8" | 1.27" | Round | 5/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 |
3/16" | 0.1875" | 2 7/8" | 1.34" | Round | 3/16" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 |
7/32" | 0.2188" | 3 1/4" | 1.42" | Round | 7/32" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 |
1/4" | 0.25" | 3 3/8" | 1.63" | Round | 1/4" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 0000 |
5/16" | 0.3125" | 3 3/4" | 1.97" | Round | 5/16" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
3/8" | 0.375" | 4 1/8" | 2.06" | Round | 3/8" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 0000000 | 00000 |
Maintenance-Length Drill Bit Sets
Also known as mechanics’ bits, these are shorter and more rigid than jobbers' bits but longer than short-length bits. A split point keeps the bit centered without a pilot hole. Their shanks have three flat sides to prevent the bit from slipping in the drill chuck.
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 | |||||
---|---|---|---|---|---|
Black-and-Gold-Oxide High-Speed Steel | |||||
29 | 1/16"-1/2" (increments of 1/64") | Split | Steel, Iron, Stainless Steel | 00000000 | 0000000 |
Drill Bit Cases
Store and organize drill bits so they stay in good working condition and don't go missing. These cases have individually marked holes for each size in your set.
Plastic cases have screw-on lids to block out moisture. Compared to steel cases, they're lighter, and they resist rust and dents. Clip them onto your belt to take with you on the job.
For technical drawings and 3-D models, click on a part number.
For Drill Bit | Overall | |||||
---|---|---|---|---|---|---|
No. of | Size | Dia. | Ht. | Features | Each | |
For Inch Drill Bits | ||||||
For Maintenance Length Class | ||||||
29 | 1/16"-1/2" (increments of 1/64") | 3 3/4" | 6 1/2" | Belt Clip | 0000000 | 000000 |