System of Measurement System of Measurement |
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Decimal Size Equivalent Decimal Size Equivalent |
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Length Class Length Class |
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Jobbers' Length |
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Extended Length |
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Maintenance Length |
Finish Finish |
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Material Material |
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For Use On For Use On |
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Flute Direction Flute Direction |
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Right Hand |
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Left Hand |
Bit Style Bit Style |
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Spiral Flute | Straight Flute |
Individual/Set Individual/Set |
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Maximum Drilling Depth Maximum Drilling Depth | Show |
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Maximum Drilling Depth Maximum Drilling Depth | Hide |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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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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For Maximum Hardness For Maximum Hardness |
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Drill Bit Decimal Size Equivalents
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About Drill Bits
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Drill Bits






These jobbers'-length bits have the rigidity and length required for most applications.
Black-oxide and black-and-gold-oxide drill bits produce less friction than uncoated drill bits.
Titanium-nitride (TiN) coated drill bits last longer and can drill at higher speeds than uncoated and oxide-coated drill bits.
Titanium-aluminum-nitride (TiAlN) coated drill bits are the most wear and temperature resistant for the longest life and highest drilling speeds.
Drill bits with a split point keep centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | Each | |||||||||
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Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Wire Gauge | ||||||||||
Black-Oxide High-Speed Steel | ||||||||||
19 ga | 0.166" | 3 1/4" | 1.87" | Round | 0.166" | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 00000 |
18 ga | 0.1695" | 3 1/4" | 1.87" | Round | 0.1695" | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 0000 |
Titanium-Nitride (TiN) Coated High-Speed Steel | ||||||||||
19 ga | 0.166" | 3 1/4" | 1.87" | Round | 0.166" | Split | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 000000000 | 0000 |
18 ga | 0.1695" | 3 1/4" | 1.87" | Round | 0.1695" | Split | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 000000000 | 0000 |
Titanium-Aluminum-Nitride (TiAlN) Coated High-Speed Steel | ||||||||||
19 ga | 0.166" | 3 1/4" | 1.87" | Round | 0.166" | Split | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 0000 |
18 ga | 0.1695" | 3 1/4" | 1.87" | Round | 0.1695" | Split | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 0000 |
Uncoated High-Speed Steel | ||||||||||
19 ga | 0.166" | 3 1/4" | 1.87" | Round | 0.166" | Standard | __ | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 |
18 ga | 0.1695" | 3 1/4" | 1.87" | Round | 0.1695" | Standard | __ | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 |
Short-Flute Extended-Length Drill Bits

The short flutes on these bits provide increased rigidity for drilling straighter holes and the long length lets you access hard-to-reach spots.
Drill bits with a split point keep centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
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Size | Decimal Size Equivalent | Max. Drilling Depth | Type | Size | Point Style | Specifications Met | For Use On | Each | |
6" Overall Lg. | |||||||||
Wire Gauge | |||||||||
Black-Oxide High-Speed Steel | |||||||||
19 ga | 0.166" | 1.87" | Round | 0.166" | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 0000000 | 00000 |
18 ga | 0.1695" | 1.87" | Round | 0.1695" | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
12" Overall Lg. | |||||||||
Wire Gauge | |||||||||
Black-Oxide High-Speed Steel | |||||||||
19 ga | 0.166" | 1.87" | Round | 0.166" | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 00000 |
18 ga | 0.1695" | 1.87" | Round | 0.1695" | Split | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 00000 |
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. | |||||||||||
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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 | |||||||||||||
7/32" | 0.2188" | 3 1/4" | 1.87" | Round | 7/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | 12 | 00000000 | 000000 |
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 |
Chip-Clearing Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications. The flutes are designed to lift chips out of the hole, reducing clogging and improving coolant flow.
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—Spiral Flute | |||||||||
Uncoated High-Speed Steel | |||||||||
19 ga | 0.166" | 3 1/4" | 1.87" | Round | 0.166" | Standard | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
18 ga | 0.1695" | 3 1/4" | 1.87" | Round | 0.1695" | Standard | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 |
Cobalt Steel Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications. Made of cobalt steel, which has better heat and wear resistance than high-speed steel, they can run up to 25% faster and have a longer tool life.
Drill bits with a split point keep centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | Each | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Wire Gauge | ||||||||||
Uncoated Cobalt Steel | ||||||||||
19 ga | 0.166" | 3 1/4" | 1.87" | Round | 0.166" | Split | NAS907 Type J | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
18 ga | 0.1695" | 3 1/4" | 1.87" | Round | 0.1695" | Split | NAS907 Type J | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
Short-Flute Extended-Length Carbide-Tipped Drill Bits

The short flutes provide increased rigidity for drilling straighter holes and the long length lets you access hard-to-reach spots. More wear resistant than cobalt steel and high-speed steel, these carbide-tipped bits maintain a sharper, harder edge at high temperatures for excellent performance on abrasive material, such as plastic. Because they aren’t as brittle as solid carbide bits, they can be used in less rigid setups, such as a hand-held drill. A split point keeps the bit centered without a pilot hole.
For technical drawings and 3-D models, click on a part number.
Shank | 12" Overall Lg. | |||||||
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Size | Decimal Size Equivalent | Type | Size | Point Style | For Use On | Max. Drilling Dp. | Each | |
Wire Gauge | ||||||||
Uncoated Carbide-Tipped Steel | ||||||||
16 ga | 0.177" | Round | 0.177" | Split | Steel, Iron, Titanium, Aluminum, Brass, Bronze, Plastic | 1.87" | 00000000 | 000000 |
Cobalt Steel Hex-Shank Drill Bits

In addition to resisting heat and wear better than high-speed steel drill bits, these can also run up to 25% faster and have a longer tool life. Insert them into power screwdrivers, impact drivers, and other tools that accept hex shanks. The flat surfaces on the hex shank allow tool chucks to grip these bits more securely than those with a round shank. A split point keeps the bits centered without a pilot hole.
Shank | ||||||||||
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Size | Decimal Size Equivalent | Overall Length | Maximum Drilling Depth | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Uncoated Cobalt Steel | ||||||||||
15/32" | 0.4688" | 5 3/4" | 1.87" | Hex | 15/32" | Split | ANSI Standards | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 000000 |
Carbide-Tipped Drill Bits for Hardened Steel

The straight flutes and notched point withstand the heavy pressure necessary to penetrate hard steel. These carbide-tipped bits maintain their sharp edges when drilling abrasive material. Because they aren’t as brittle as solid carbide bits, they can be used in less rigid setups, such as a hand-held drill. They are jobbers' length and have the rigidity and length required for most hand-held drilling and machine tool applications.
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 Max. Hardness | Each | |
Inch | |||||||||
Uncoated Carbide-Tipped Steel | |||||||||
15/32" | 0.4688" | 5 3/4" | 1.87" | Round | 15/32" | Notched | Rockwell C60 | 0000000 | 000000 |
Drill Bits for Plastic

The sharp point allows for gradual penetration to reduce friction and eliminate cracking and chipping when drilling in plastic. These bits are jobbers' length and have the rigidity and length required for most applications.
For technical drawings and 3-D models, click on a part number.
Shank | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Each | |
Wire Gauge | ||||||||
Uncoated High-Speed Steel | ||||||||
2 ga | 0.221" | 3 7/8" | 1.87" | Round | 0.221" | Standard | 000000000 | 00000 |
1 ga | 0.228" | 3 7/8" | 1.87" | Round | 0.228" | Standard | 000000000 | 0000 |
Letter | ||||||||
Uncoated High-Speed Steel | ||||||||
A | 0.234" | 3 7/8" | 1.87" | Round | 0.234" | Standard | 000000000 | 0000 |
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.
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 | |
Inch | |||||||||
Uncoated Cobalt Steel | |||||||||
19/64" | 0.2969" | 3 5/8" | 1.87" | Round | 19/64" | Split | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 000000 |