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Arbor Hole
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Thread Size
Performance
Face Mill Arbors
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Mount large-diameter milling cutters securely in Bridgeport and similar milling machines that have an R8 taper spindle.
Shank Thread | Head | Nose | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Arbor Hole Dia. | Size | Gender | Dia. | Lg. | Dia | Lg. | For Keyway Wd. | Material | Fabrication | Each | ||
| 1/2" | 7/16"-20 | Female | 1 3/8" | 1" | 1/2" | 9/16" | 1/4" | Steel | Heat Treated | 8778A11 | 0000000 | |
| 3/4" | 7/16"-20 | Female | 2" | 1" | 3/4" | 11/16" | 5/16" | Steel | Heat Treated | 8778A12 | 000000 | |
| 1" | 7/16"-20 | Female | 2.38" | 1" | 1" | 11/16" | 3/8" | Steel | Heat Treated | 8778A13 | 000000 | |
| 1 1/4" | 7/16"-20 | Female | 2.88" | 1" | 1 1/4" | 11/16" | 1/2" | Steel | Heat Treated | 8778A14 | 000000 | |
| 1 1/2" | 7/16"-20 | Female | 3 1/2" | 1 3/4" | 1 1/2" | 1" | 5/8" | Steel | Heat Treated | 8778A15 | 000000 | |
Quick-Change Milling Machine Tool Holders
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After installing the R8 body in the milling machine spindle, tool holders can be switched out in seconds. To remove a tool holder, depress the brass locking button and rotate the collar on the R8 body. When a new tool holder is inserted, a spring-loaded pin snaps the collar back into the locked position.
