Drill Bit Decimal Size Equivalents
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About Countersinks
Countersinks cut a cone-shaped opening to install screws and rivets flush with a surface or hold workpieces between centers on a lathe. They can also be used for chamfering and deburring.
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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.
For technical drawings and 3-D models, click on a part number.
Shank | Each | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Drill Bit 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 | ||||||||||
78 ga. | 0.016" | 7/8" | 0.16" | Round | 0.016" | Standard | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 00000 |
77 ga. | 0.018" | 7/8" | 0.16" | Round | 0.018" | Standard | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 0000 |
76 ga. | 0.02" | 7/8" | 0.15" | Round | 0.02" | Standard | NAS907 Type B | Steel, Iron, Stainless Steel | 00000000 | 0000 |
Titanium-Nitride (TiN) Coated High-Speed Steel | ||||||||||
78 ga. | 0.016" | 7/8" | 0.16" | Round | 0.016" | Standard | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 000000000 | 0000 |
77 ga. | 0.018" | 7/8" | 0.16" | Round | 0.018" | Standard | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 000000000 | 0000 |
76 ga. | 0.02" | 7/8" | 0.15" | Round | 0.02" | Standard | NAS907 Type B | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Aluminum, Brass, Bronze, Plastic | 000000000 | 0000 |
Uncoated High-Speed Steel | ||||||||||
78 ga. | 0.016" | 7/8" | 0.16" | Round | 0.016" | Standard | __ | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 |
77 ga. | 0.018" | 7/8" | 0.16" | Round | 0.018" | Standard | __ | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 |
76 ga. | 0.02" | 7/8" | 0.15" | Round | 0.02" | Standard | __ | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 |
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 | |||||||||
---|---|---|---|---|---|---|---|---|---|
Drill Bit 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 | |||||||||
78 ga. | 0.016" | 7/8" | 0.16" | Round | 0.016" | Standard | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 00000 |
77 ga. | 0.018" | 7/8" | 0.16" | Round | 0.018" | Standard | Steel, Iron, Aluminum, Brass, Bronze, Plastic | 00000000 | 0000 |
76 ga. | 0.02" | 7/8" | 0.15" | Round | 0.02" | 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.
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 | Each | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Specifications Met | For Use On | Each | |
Wire Gauge | ||||||||||
Uncoated Cobalt Steel | ||||||||||
78 ga. | 0.016" | 7/8" | 0.16" | Round | 0.016" | Standard | __ | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 00000 |
77 ga. | 0.018" | 7/8" | 0.16" | Round | 0.018" | Standard | __ | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
76 ga. | 0.02" | 7/8" | 0.15" | Round | 0.02" | Standard | __ | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 00000000 | 0000 |
Titanium-Nitride (TiN) Coated Cobalt Steel | ||||||||||
78 ga. | 0.016" | 7/8" | 0.19" | Round | 0.016" | Standard | NAS907 Type J | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
77 ga. | 0.018" | 7/8" | 0.19" | Round | 0.018" | Standard | NAS907 Type J | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
76 ga. | 0.02" | 7/8" | 0.19" | Round | 0.02" | Standard | NAS907 Type J | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 000000000 | 0000 |
Threaded-Shank Drill Bits
All have a 1/4"-28 threaded shank which installs directly into the threaded spindle on a compatible 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 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Thread Size | Point Style | Specifications Met | For Use On | Each | |
Inch—Short Length | |||||||||||
Black-Oxide High-Speed Steel | |||||||||||
9/64" | 0.1406" | 7/8" | 0.44" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 000000 |
5/32" | 0.1563" | 7/8" | 0.44" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
11/64" | 0.1719" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 00000 |
3/16" | 0.1875" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
7/32" | 0.2188" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
1/4" | 0.25" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
Wire Gauge—Short Length | |||||||||||
Black-Oxide High-Speed Steel | |||||||||||
30 ga. | 0.1285" | 7/8" | 0.44" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
27 ga. | 0.144" | 7/8" | 0.44" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
21 ga. | 0.159" | 7/8" | 0.44" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
20 ga. | 0.161" | 7/8" | 0.44" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
13 ga. | 0.185" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
12 ga. | 0.189" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
11 ga. | 0.191" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
10 ga. | 0.1935" | 7/8" | 0.38" | Threaded | 1/4" | 1/4"-28 | Split | NAS965 Type B | Steel, Iron, Stainless Steel | 0000000 | 0000 |
Inch Size Depth-Limiting Drill Bit Stop Collars
Ensure identical hole depths every time. Position the collar on your bit and tighten the set screw.
For technical drawings and 3-D models, click on a part number.
For Drill Bit | |||||||
---|---|---|---|---|---|---|---|
Size | Size Decimal Equivalent | Overall Lg. | OD | Hex Key Size for Set Screw | Material | Each | |
3/8" | 0.3750" | 7/8" | 7/8" | 3/32" | Steel | 00000000 | 00000 |
25/64" | 0.3906" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
13/32" | 0.4063" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
27/64" | 0.4219" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
7/16" | 0.4375" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
29/64" | 0.4531" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
15/32" | 0.4688" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
31/64" | 0.4844" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
1/2" | 0.5000" | 7/8" | 7/8" | 1/8" | Steel | 00000000 | 0000 |
Metric Size Depth-Limiting Drill Bit Stop Collars
Ensure identical hole depths every time. Position the collar on your bit and tighten the set screw.
For technical drawings and 3-D models, click on a part number.
Letter Size Depth-Limiting Drill Bit Stop Collars
Ensure identical hole depths every time. Position the collar on your bit and tighten the set screw.
For technical drawings and 3-D models, click on a part number.
High-Speed Steel Drill-Bit Countersinks for Screws
For use on wood, plastic, and most metals, these countersinks attach to a drill bit (sold separately) to countersink and drill holes at the same time. They attach to the drill bit with two set screws and the position can be adjusted for different screw lengths. An 82° countersink angle is compatible with the profile of flat- and oval-head inch screws; a 90° countersink angle is compatible with the profile of flat- and oval-head metric screws and is also good for deburring.
Optional collar (not included) controls the cutting depth of your countersink. It attaches with two set screws.
For technical drawings and 3-D models, click on a part number.
Countersinks | Optional Collars | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | For Drill Bit Size | Body Dia. | Overall Lg. | For Use On | Each | OD | Wd. | Each | ||
82° Countersink Angle | ||||||||||
Uncoated High-Speed Steel | ||||||||||
4 Flute | ||||||||||
No. 5 | 1/8" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 000000 | 5/8" | 1/4" | 0000000 | 00000 |
No. 6 | 9/64" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 7 | 5/32" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 7 | 5/32" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 8 | 11/64" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 9 | 3/16" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 9 | 3/16" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 7/16" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 11/16" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 12 | 7/32" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 12 | 7/32" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 14 | 1/4" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
90° Countersink Angle | ||||||||||
Uncoated High-Speed Steel | ||||||||||
4 Flute | ||||||||||
No. 5 | 1/8" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 6 | 9/64" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 7 | 5/32" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 7 | 5/32" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 8 | 11/64" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 9 | 3/16" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 9 | 3/16" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 7/16" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 11/16" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 12 | 7/32" | 3/8" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 12 | 7/32" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 14 | 1/4" | 1/2" | 7/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
Carbon Steel Drill-Bit Countersinks for Screws
Only for use on wood and plastic, these countersinks attach to a drill bit (sold separately) to countersink and drill holes at the same time. They attach to the drill bit with two set screws and the position can be adjusted for different screw lengths. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws.
Optional collar (not included) controls the cutting depth of your countersink. It attaches with two set screws.
For technical drawings and 3-D models, click on a part number.
Countersinks | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
82° Countersink Angle | Optional Collars | |||||||||
For Screw Size | For Drill Bit Size | Body Dia. | Overall Lg. | For Use On | Each | OD | Wd. | Each | ||
Uncoated Carbon Steel | ||||||||||
4 Flute | ||||||||||
No. 4 | 7/64" | 5/16" | 7/8" | Plastic, Wood | 0000000 | 000000 | 9/16" | 1/4" | 0000000 | 00000 |
No. 5 | 1/8" | 3/8" | 7/8" | Plastic, Wood | 0000000 | 0000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 6 | 9/64" | 3/8" | 7/8" | Plastic, Wood | 0000000 | 0000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 7 | 5/32" | 3/8" | 7/8" | Plastic, Wood | 0000000 | 0000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 7 | 5/32" | 1/2" | 7/8" | Plastic, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 8 | 11/64" | 3/8" | 7/8" | Plastic, Wood | 0000000 | 0000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 9 | 3/16" | 3/8" | 7/8" | Plastic, Wood | 0000000 | 0000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 9 | 3/16" | 1/2" | 7/8" | Plastic, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 3/8" | 7/8" | Plastic, Wood | 0000000 | 0000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 7/16" | 7/8" | Plastic, Wood | 0000000 | 00000 | 11/16" | 1/4" | 0000000 | 0000 |
No. 10 | 13/64" | 1/2" | 7/8" | Plastic, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 12 | 7/32" | 3/8" | 7/8" | Plastic, Wood | 0000000 | 0000 | 5/8" | 1/4" | 0000000 | 0000 |
No. 12 | 7/32" | 1/2" | 7/8" | Plastic, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
No. 14 | 1/4" | 1/2" | 7/8" | Plastic, Wood | 0000000 | 00000 | 3/4" | 1/4" | 0000000 | 0000 |
Secure-Hold Bit Adapters for Ratchet Wrenches
Lock your bit into the adapter to prevent accidental disengagement. These adapters fit square-drive tools and accept hex-shank screwdriver bits. They have nonmagnetic bit holders, so they won’t attract loose metal parts and shavings.
For technical drawings and 3-D models, click on a part number.
Square Drive Size | For Bit Shank Type | For Bit Hex Shank Size | Overall Lg. | Material | Each | |
With Set Screw | ||||||
---|---|---|---|---|---|---|
1/4" | Hex | 1/4" | 7/8" | Steel | 0000000 | 00000 |