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Boring Tool Holders for Milling Machines
Instead of widening a hole using a lathe, which turns the workpiece while the cutting tool stays still, use these holders to turn your boring bar in a milling machine and keep the workpiece stationary. They’re good for creating holes that are too large to drill or a diameter you don’t have a drill bit for. To help you bore holes to precise diameters, these holders have an adjustment dial with fine increments. Mount them in your milling machine using their shank. They’re also known as boring heads.
Holders for interchangeable shanks work with various hole sizes and machines. Add a compatible shank, these holders do not include one.
Boring Tool Holders
Holder with Straight Shank
Holder with R8 Taper Shank
Holder for Interchangeable Shanks
Adjustment Dial
Shank | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tool Bit Shank Diameter | Length | Diameter | Thread Size  | Head Diameter | Offset Travel | Vertical Hole Spacing | Overall Length | Material | Features | Each | |
Holder with Straight Shank | |||||||||||
| 3/8" | 2 5/8" | 3/4" | __ | 2" | 0.75" | 0.625" | 5 1/16" | Steel | Adjustment Dial | 00000000 | 0000000 |
| 1/2" | 2 5/8" | 3/4" | __ | 2 1/2" | 0.75" | 0.75" | 5 13/16" | Steel | Adjustment Dial | 00000000 | 000000 |
| 5/8" | 2 5/8" | 3/4" | __ | 2 1/2" | 0.75" | 0.75" | 5 13/16" | Steel | Adjustment Dial | 00000000 | 000000 |
| 3/4" | 2 5/8" | 1" | __ | 3" | 1.25" | 0.938" | 6 1/8" | Steel | Adjustment Dial | 00000000 | 000000 |
Holder with R8 Taper Shank | |||||||||||
| 3/8" | 4" | __ | __ | 2" | 0.75" | 0.625" | 6 7/16" | Steel | Adjustment Dial | 00000000 | 000000 |
| 1/2" | 4" | __ | __ | 2 1/2" | 0.75" | 0.75" | 7 3/16" | Steel | Adjustment Dial | 00000000 | 000000 |
| 5/8" | 4" | __ | __ | 2 1/2" | 0.75" | 0.75" | 7 3/16" | Steel | Adjustment Dial | 00000000 | 000000 |
| 3/4" | 4" | __ | __ | 3" | 1.25" | 0.938" | 7 1/2" | Steel | Adjustment Dial | 00000000 | 000000 |
Holder for Interchangeable Shanks | |||||||||||
| 3/8" | __ | __ | 7/8"-20 | 2" | 0.75" | 0.625" | 2 7/16" | Steel | Adjustment Dial | 00000000 | 000000 |
| 1/2" | __ | __ | 7/8"-20 | 2 1/2" | 0.75" | 0.75" | 3 3/16" | Steel | Adjustment Dial | 0000000 | 000000 |
| 5/8" | __ | __ | 7/8"-20 | 2 1/2" | 0.75" | 0.75" | 3 3/16" | Steel | Adjustment Dial | 00000000 | 000000 |
| 3/4" | __ | __ | 1 1/2"-18 | 3" | 1.25" | 0.313" | 3 1/2" | Steel | Adjustment Dial | 00000000 | 000000 |
Shanks for Boring Tool Holders for Interchangeable Shanks
Interchangeable Straight Shank
Interchangeable R8 Shank
Interchangeable Morse Taper Shank
Interchangeable Machine Taper Shank
Shank | ||||||||
|---|---|---|---|---|---|---|---|---|
| Thread Size | Morse Taper Size | Machine Taper Size | Length | Diameter | Material | Includes | Each | |
Straight Shank | ||||||||
| 7/8"-20 | __ | __ | 2 5/8" | 1/2" | Steel | __ | 0000000 | 000000 |
| 7/8"-20 | __ | __ | 2 5/8" | 3/4" | Steel | __ | 00000000 | 00000 |
| 1 1/2"-18 | __ | __ | 2 5/8" | 1" | Steel | __ | 00000000 | 00000 |
R8 Taper Shank | ||||||||
| 7/8"-20 | __ | __ | 4" | __ | Steel | __ | 00000000 | 00000 |
| 1 1/2"-18 | __ | __ | 4" | __ | Steel | __ | 00000000 | 00000 |
Morse Taper Shank | ||||||||
| 7/8"-20 | 3 | __ | 3 7/8" | __ | Steel | Tang | 00000000 | 00000 |
| 1 1/2"-18 | 4 | __ | 4 7/8" | __ | Steel | Tang | 00000000 | 00000 |
Machine Taper Shank | ||||||||
| 7/8"-20 | __ | #40 | 3 3/4" | __ | Steel | Draw Bar, Drive Flange | 00000000 | 000000 |
| 1 1/2"-18 | __ | #40 | 3 3/4" | __ | Steel | Draw Bar, Drive Flange | 00000000 | 000000 |