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Home » PROMAX Premium » PRO-4 Patented End Mills

PRO-4 Patented End Mills

The Patented PRO-4 solid carbide end mill by PROMAX Tools is a hybrid cutter combining the best elements of our Finishing End Mill and our Rougher-Finisher. With 8 geometries on 4 flutes, the PRO-4 presents an entirely unique approach to common problems in high-performance machining.

Unique Hybrid Geometry

These precision cutting tools have cutting edge chip-breakers and finishing geometry that appear in an alternating pattern on either the lower or upper half of each flute. In the resulting cutting action, a chip-breaking edge on one half of the tool on one flute is followed by a finishing edge in the same region on the following flute. This geometry accomplishes what other geometries attempt through unequal indexing or multiple helixes.

  • Eliminates Chatter & Vibration
  • Relieves Cutting Pressure Against The Tool With OD Chip-Breakers While Delivering An Excellent Finish
  • Easy & Inexpensive To Regrind (Equally indexed flutes require standard face regrinding only. No OD or special Indexing.)
  • Ready For Shrink-Fit Holders

PRO-4 Solid Carbide End Mills come standard with the PROMAX Tools Advanced AlTiN coating (Part Number ending in 4) and our New nACRO® coating (Part Number ending in 5). These precision cutting tools come in a variety of Length of Cuts including Stub, Standard and Extended Reach.

  Product Name   
PRO-4 Square End – Series 190
PRO-4 Square End – Series 190
( 32 products )
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PRO-4 with Corner Radius – Series 191
PRO-4 with Corner Radius – Series 191
( 28 products )
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