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12mm Up-Cut Spiral – 1/2″ Shank (AstraHP Coated)

A true-metric up-cut spiral designed for CNC machining of hardwoods and solid stock. Ground to an exact 10 mm cut diameter with a rigid 1/2″ shank and AstraHP coating for consistent performance in production environments.

12mm Up-Cut Spiral – 1/2″ Shank (AstraHP Coated) - Main image
$66.99 $99.99 In stock

Category: Up-Cut CNC Bits

This metric 12mm up cut spiral is engineered for CNC shops running metric CAD/CAM workflows and cutting hardwood panels or solid stock. The cut diameter is ground true to metric—no imperial rounding—so toolpaths and finished part dimensions remain exact from program to part.

The up-cut geometry efficiently evacuates chips upward, making it well-suited for hardwoods, solid lumber, and applications where chip clearance and heat control are critical. A 1/2″ shank provides the rigidity required for stable cutting in production CNC machines, while AstraHP coating helps manage heat and extend edge life during longer runs.

This tool is intended for CNC use only and is built for professional cabinet, furniture, and production workflows.

  • AstraHP Coated
  • Solid Carbide
  • 1/2″ Shank
  • 12mm Tip diameter
  • 1″ Length of cut
  • 3″ Overall Length
  • Made In USA
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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Harper ★★★★★

Finally a bit that actually matches the metric dimension in the CAD file—no more recalculating toolpaths. The up-cut clears chips fast when I’m slotting plywood panels, and the Astra coating seems to hold up better than the uncoated bits I’ve used.

Lily P. ★★★★★

I'm cutting laminated birch on a CNC for cabinet doors and the 12mm grind is dead-on metric, which saved me from recalculating toolpaths. The up-cut clears chips fast and leaves a clean bottom edge with almost no fuzz.

Abigail G. ★★★★★

Finally a bit that actually matches my metric toolpath without any guesswork. The 12mm cut diameter is spot on and the up-cut clears chips beautifully from solid walnut.