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About Drill Bits
Compare material, finish, length class, and decimal size equivalents.
High-Speed Steel Step Drill Bits
Standard |
Shank | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equiv. | Overall Lg. | Type | Size | Drill Bit Point Type | Each | |||
Black Oxide | |||||||||
| 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2" | 0.125", 0.1563", 0.1875", 0.2188", 0.25", 0.2813", 0.3125", 0.3438", 0.375", 0.4063", 0.4375", 0.4688", 0.5" | 3 1/8" | Round/3-Flat | 1/4" | Standard | 5910N11 | 000000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875" | 3" | Round/3-Flat | 3/8" | Standard | 5910N14 | 00000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5" | 3 1/8" | Round/3-Flat | 1/4" | Standard | 5910N12 | 00000 | ||
| 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" | 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75" | 2 5/8" | Round/3-Flat | 3/8" | Standard | 5910N13 | 00000 | ||
| 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1 1/8", 1 1/4", 1 3/8" | 0.25", 0.375", 0.5", 0.625", 0.75", 0.875", 1", 1.125", 1.25", 1.375" | 3 1/8" | Round/3-Flat | 3/8" | Standard | 5910N15 | 000000 | ||
| 3/8", 1/2" | 0.375", 0.5" | 2" | Round/3-Flat | 1/4" | Standard | 5910N16 | 00000 | ||
| 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1" | 0.5", 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875", 0.9375", 1" | 3 1/4" | Round/3-Flat | 1/2" | Standard | 5910N17 | 00000 | ||
| 7/8", 1", 1 1/8", 1 1/4", 1 3/8" | 0.875", 1", 1.125", 1.25", 1.375" | 3" | Round/3-Flat | 3/8" | Standard | 5910N18 | 000000 | ||
| 4.0 mm, 5.0 mm, 6.0 mm, 6.5 mm, 8.0 mm, 9.0 mm, 10.0 mm, 11.0 mm, 12.0 mm | 0.1575", 0.1969", 0.2362", 0.2559", 0.315", 0.3543", 0.3937", 0.4331", 0.4724" | 65 mm | Round/3-Flat | 6.4 mm | Standard | 5910N19 | 00000 | ||
| 4.0 mm, 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm | 0.1575", 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874" | 65 mm | Round/3-Flat | 6.4 mm | Standard | 5910N21 | 00000 | ||
| 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm, 22.0 mm, 24.0 mm, 26.0 mm, 28.0 mm, 30.0 mm, 32.0 mm, 35.0 mm | 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874", 0.8661", 0.9449", 1.0236", 1.1024", 1.1811", 1.2598", 1.378" | 89 mm | Round/3-Flat | 9.53 mm | Standard | 5910N22 | 000000 | ||
Titanium Nitride (TiN) Coated | |||||||||
| 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2" | 0.125", 0.1563", 0.1875", 0.2188", 0.25", 0.2813", 0.3125", 0.3438", 0.375", 0.4063", 0.4375", 0.4688", 0.5" | 3 1/4" | Hex | 1/4" | Standard | 89315A41 | 00000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875" | 3" | Hex | 3/8" | Standard | 89315A42 | 00000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5" | 3 1/4" | Hex | 1/4" | Standard | 89315A46 | 00000 | ||
| 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" | 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75" | 2 5/8" | Hex | 3/8" | Standard | 89315A43 | 00000 | ||
| 1/4", 7/8", 1 1/8" | 0.25", 0.875", 1.125" | 3" | Hex | 3/8" | Standard | 89315A45 | 000000 | ||
| 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1" | 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875", 0.9375", 1" | 2 7/8" | Hex | 3/8" | Standard | 89315A44 | 00000 | ||
Titanium Aluminum Nitride (TiAlN) Coated | |||||||||
| 4.0 mm, 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm | 0.1575", 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874" | 76 mm | Quick-Change Hex | 6.35 mm | Standard | 89275A36 | 00000 | ||
| 4.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm, 22.0 mm, 24.0 mm, 26.0 mm, 28.0 mm, 30.0 mm | 0.1575", 0.5512", 0.6299", 0.7087", 0.7874", 0.8661", 0.9449", 1.0236", 1.1024", 1.1811" | 95 mm | Hex | 6.35 mm | Standard | 89275A37 | 000000 | ||
Uncoated | |||||||||
| 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2" | 0.125", 0.1563", 0.1875", 0.2188", 0.25", 0.2813", 0.3125", 0.3438", 0.375", 0.4063", 0.4375", 0.4688", 0.5" | 3 1/4" | Hex | 1/4" | Standard | 8841A21 | 00000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875" | 3" | Hex | 3/8" | Standard | 8841A24 | 00000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5" | 3 3/8" | Hex | 1/4" | Standard | 8841A22 | 00000 | ||
| 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" | 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75" | 2 5/8" | Hex | 3/8" | Standard | 8841A23 | 00000 | ||
| 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1 1/8", 1 1/4", 1 3/8" | 0.25", 0.375", 0.5", 0.625", 0.75", 0.875", 1", 1.125", 1.25", 1.375" | 3 1/8" | Hex | 3/8" | Standard | 8841A25 | 00000 | ||
| 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1" | 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875", 0.9375", 1" | 2 1/2" | Hex | 3/8" | Standard | 8841A33 | 00000 | ||
| 13/16", 7/8", 15/16", 1", 1 1/16", 1 1/8", 1 3/16", 1 1/4", 1 5/16", 1 3/8" | 0.8125", 0.875", 0.9375", 1", 1.0625", 1.125", 1.1875", 1.25", 1.3125", 1.375" | 2 1/8" | Hex | 3/8" | Standard | 8841A34 | 000000 | ||
| 7/8", 1 1/8" | 0.875", 1.125" | 3" | Hex | 3/8" | Standard | 8841A35 | 00000 | ||
| 4.0 mm, 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm, 20.0 mm, 22.0 mm | 0.1575", 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087", 0.7874", 0.8661" | 76 mm | Hex | 10 mm | Standard | 89275A14 | 00000 | ||
| 5.0 mm, 7.5 mm, 10.0 mm, 13.0 mm, 16.0 mm, 19.0 mm, 21.0 mm, 23.0 mm, 26.0 mm, 29.0 mm, 31.0 mm, 33.0 mm, 35.0 mm | 0.1968", 0.2953", 0.3937", 0.5118", 0.6299", 0.748", 0.8268", 0.9055", 1.0236", 1.1417", 1.2205", 1.2992", 1.378" | 79 mm | Hex | 11.1 mm | Standard | 89275A15 | 00000 | ||
| 6.0 mm, 8.0 mm, 10.0 mm, 12.0 mm, 14.0 mm, 16.0 mm, 18.0 mm | 0.2362", 0.315", 0.3937", 0.4724", 0.5512", 0.6299", 0.7087" | 64 mm | Hex | 10 mm | Standard | 89275A13 | 00000 | ||
Step Drill High-Speed Steel Bit Sets
No. of Pieces | Drill Bit Sizes Included | System of Measurement | Drill Bit Point Style | Container Type | Each | |||
|---|---|---|---|---|---|---|---|---|
Titanium Nitride (TiN) Coated | ||||||||
| 3 | 1 each in sizes 1/8"-1/2", 3/16"-1/2", 1/4"-3/4" | Inch | Standard Point | Plastic Pouch | 89315A48 | 0000000 | ||
Uncoated | ||||||||
| 3 | 1 each in sizes 1/8"-1/2", 3/16"-1/2", 1/4"-3/4" | Inch | Standard Point | — | 8841A32 | 00000 | ||
| 4 | 1 each in sizes 1/8"-1/2", 3/16"-1/2", 3/16"-7/8", 13/16"-1 3/8" | Inch | Standard Point | Plastic Case | 8841A36 | 000000 | ||
Cobalt Steel Step Drill Bits
Shank | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equiv. | Overall Lg. | Type | Size | Drill Bit Point Type | Each | |||
Uncoated | |||||||||
| 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2" | 0.125", 0.1563", 0.1875", 0.2188", 0.25", 0.2813", 0.3125", 0.3438", 0.375", 0.4063", 0.4375", 0.4688", 0.5" | 3 1/4" | Hex | 1/4" | Standard | 8841A51 | 000000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875" | 3" | 3-Flat | 3/8" | Standard | 8841A53 | 00000 | ||
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5" | 3 3/8" | Hex | 1/4" | Standard | 8841A52 | 00000 | ||
| 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" | 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75" | 2 5/8" | 3-Flat | 3/8" | Standard | 8841A54 | 00000 | ||
| 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1" | 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875", 0.9375", 1" | 2 1/2" | 3-Flat | 3/8" | Standard | 8841A55 | 00000 | ||
| 7/8", 1 1/8" | 0.875", 1.125" | 3" | 3-Flat | 3/8" | Standard | 8841A56 | 000000 | ||
Multidiameter High-Speed Steel Step Drill Bits
Shank | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Style | Drill Bit Size | Decimal Size Equiv. | Overall Lg. | Max. Drilling Dp. | Type | Size | Drill Bit Point Type | Each | |||
Black Oxide | |||||||||||
| A | 1/8" to 9/16" | 0.125" to 0.5625" | 2 1/4" | 0.125" | Round/3-Flat | 1/4" | Standard | 8910A11 | 000000 | ||
| A | 1/4" to 13/16" | 0.25" to 0.8125" | 2 3/4" | 0.125" | Round/3-Flat | 3/8" | Standard | 8910A12 | 00000 | ||
| A | 5/8" to 1 3/16" | 0.625" to 1.1875" | 3" | 0.125" | Round/3-Flat | 3/8" | Standard | 8910A13 | 00000 | ||
| A | 1" to 1 5/8" | 1" to 1.625" | 3 1/4" | 0.125" | Round/3-Flat | 3/8" | Standard | 8910A14 | 000000 | ||
| B | 1 1/2" to 2 1/16" | 1.5" to 2.0625" | 2 3/4" | 0.125" | Round/3-Flat | 3/8" | — | 8910A15 | 000000 | ||
Counterbore Drill Bits
Dia. | Lg. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body | Step | Step | Overall | Point Angle | For Use On | Mfr. | Each | |||
Uncoated High-Speed Steel | |||||||||||
| No. 6 | 0.250" | 0.15" | 1/2" | 4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A31 | 000000 | ||
| No. 8 | 0.290" | 0.178" | 1/2" | 4 1/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A32 | 00000 | ||
| No. 10 | 0.332" | 0.204" | 5/8" | 4 3/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A33 | 00000 | ||
| 1/4" | 0.406" | 0.281" | 11/16" | 5 1/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A34 | 00000 | ||
| 5/16" | 0.500" | 0.344" | 3/4" | 6" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A35 | 00000 | ||
| 3/8" | 0.594" | 0.406" | 7/8" | 7 1/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A36 | 00000 | ||
| 7/16" | 0.688" | 0.469" | 1" | 7 5/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A38 | 00000 | ||
| 1/2" | 0.781" | 0.531" | 1" | 9 7/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A37 | 000000 | ||
Countersink Drill Bits for Screws
Dia. | Lg. | 82° Countersink Angle | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body | Step | Step | Overall | Shank Dia. | Point Angle | For Use On | Mfr. | Each | |||
Uncoated High-Speed Steel | ||||||||||||
2 Flutes | ||||||||||||
| No. 6 | 0.281" | 0.142" | 1/2" | 4 1/4" | 0.2813" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A51 | 000000 | ||
| No. 8 | 0.332" | 0.169" | 1/2" | 4 3/4" | 0.3320" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A52 | 00000 | ||
| No. 10 | 0.386" | 0.196" | 5/8" | 5 1/8" | 0.3860" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A53 | 00000 | ||
| 1/4" | 1/2" | 0.257" | 11/16" | 6" | 0.5000" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A54 | 00000 | ||
| 5/16" | 5/8" | 0.320" | 3/4" | 7 1/8" | 0.6250" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A55 | 00000 | ||
| 3/8" | 3/4" | 0.383" | 7/8" | 5" | 0.7500" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A56 | 00000 | ||
| 7/16" | 0.813" | 0.446" | 1" | 5 1/4" | 0.8125" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A58 | 000000 | ||
| 1/2" | 7/8" | 0.510" | 1" | 5 1/2" | 0.8750" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Republic Drill | 8914A57 | 000000 | ||
Built-In-Pilot Counterbores
High-Speed Steel
Pilot | Shank | Uncoated | Titanium Nitride (TiN) Coated | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body Dia. | Dia. | Lg. | Overall Lg. | Dia. | Type | No. of Flutes | Mfr. | Each | Each | ||||
| No. 4 | 0.186" | 0.112" | 0.156" | 3 7/8" | 5/32" | Round | 4 | Alvord-Polk Tool | 2919A31 | 000000 | 28225A31 | 000000 | ||
| No. 5 | 0.205" | 1/8" | 0.188" | 4 1/8" | 3/16" | Round | 4 | Alvord-Polk Tool | 2919A32 | 00000 | 28225A32 | 00000 | ||
| No. 6 | 0.228" | 0.138" | 0.219" | 4 5/8" | 7/32" | Round | 4 | Alvord-Polk Tool | 2919A33 | 00000 | 28225A33 | 00000 | ||
| No. 8 | 0.272" | 0.164" | 0.250" | 5" | 1/4" | Round | 4 | Alvord-Polk Tool | 2919A34 | 00000 | 28225A34 | 00000 | ||
| No. 10 | 0.314" | 0.19" | 0.281" | 5 1/4" | 9/32" | Round | 4 | Alvord-Polk Tool | 2919A35 | 00000 | 28225A35 | 00000 | ||
| 1/4" | 0.382" | 1/4" | 0.313" | 5 5/8" | 5/16" | Round | 4 | Alvord-Polk Tool | 2919A36 | 00000 | 28225A36 | 00000 | ||
| 5/16" | 0.475" | 5/16" | 0.375" | 6 1/8" | 3/8" | Round | 4 | Alvord-Polk Tool | 2919A37 | 00000 | 28225A37 | 00000 | ||
| 3/8" | 0.572" | 3/8" | 0.500" | 6 1/2" | 1/2" | Round | 4 | Alvord-Polk Tool | 2919A38 | 00000 | 28225A38 | 00000 | ||
| 7/16" | 0.663" | 7/16" | 0.500" | 7" | 1/2" | Round | 4 | Alvord-Polk Tool | 2919A39 | 00000 | 28225A39 | 000000 | ||
| 1/2" | 0.757" | 1/2" | 0.500" | 7 1/2" | 1/2" | Round | 4 | Alvord-Polk Tool | 2919A41 | 00000 | 28225A41 | 000000 | ||
| 5/8" | 0.945" | 5/8" | 0.625" | 7 5/8" | 5/8" | Round | 4 | Alvord-Polk Tool | 2919A42 | 000000 | 28225A42 | 000000 | ||
| 3/4" | 1.133" | 3/4" | 0.750" | 7 3/4" | 3/4" | Round | 4 | Alvord-Polk Tool | 2919A43 | 000000 | 28225A43 | 000000 | ||
| 7/8" | 1.322" | 7/8" | 0.875" | 8 1/8" | 7/8" | Round | 4 | Alvord-Polk Tool | 2919A47 | 000000 | 28225A44 | 000000 | ||
| 1" | 1.510" | 1" | 1.000" | 8 1/2" | 1" | Round | 4 | Alvord-Polk Tool | 2919A45 | 000000 | 28225A45 | 000000 | ||
Built-In-Pilot Counterbore Sets
For Screw Size | No. of Pieces | Shank Type | No. of Flutes | Mfr. | Each | |||
|---|---|---|---|---|---|---|---|---|
Uncoated High-Speed Steel | ||||||||
| No. 4, No. 5, No. 6, No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2" | 10 | Round | 4 | Alvord-Polk Tool | 2919A12 | 0000000 | ||






























