Screw On Helix Mortise Arbors
These arbors are made to fit the screw type helix mortise cutters only.
All of our router bits are Made in USA by the award winning Whiteside Machine in their North Carolina factory.
| Part Number | Shank Diameter | Thread | Overall Length |
| HMA-1/4 | 1/4" | 1/4"-28 | 1-3/4" |
| HMA-1/2 | 1/2" | 1/4"-28 | 1-3/4" |
| *HMA-1/4A | 1/4" | 5/16"-24 | 1-3/4" |
| *HMA-1/2A | 1/2" | 5/16"-24 | 1-3/4" |
| *5/16"-24 thread only fits 13-1250A cutter | |||
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