CNC router tools for woodworking, metal machining, plastic cutting and composite cutting with precision collets and toolholders
Think & Tinker, Ltd.
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PreciseBIT 4-flute Scoring / Engraving Countersinks 


  • Geometry - 4 flute, 1/4 in. (6.35mm) dia. 1/8 in. (3.18 mm) shank, "V" point
  • Length - indicated 0.010 in. 
  • Tip angle - nominal  0.5
  • Max. depth of cut - DOC (penetration) varies by tip angle:
    • 60° - 0.217 in. (5.5mm)
    • 82° - 0.144 in. (3.7mm)
    • 90° - 0.125 in. (3.2mm)
    • 100° - 0.105 in. (2.7mm)
    • 120° - 0.072 in. (1.8mm)
  • Shank dia. - 0.1250 in. (3.18 mm) +0.00, -0.0002 in.
  • Runout (TIR) -  0.0002 in. max
  • Max. depth of cut - EFL varies by tip angle
  • Anticipated Life - 6,000 linear inches (phenolic, CNC milling)
  • Material - solid submicrograin carbide
  • Ring Set - 0.800 in. 0.002 in. (optional)
  • Operating RPM - CNC certified operation 20k RPM to 100k RPM



  • 4-flute plunge tip insures long life and quiet operation
  • Cutting edge geometry virtually eliminates chatter at high feed rates
  • Optimized for scoring, beveling, carving and engraving non-ferrous metals, hardwoods, phenolics, stabilized woods and composite minerals.


  • Dimensional signage
  • Engraving plaques, awards, medallions, and labels (water based cutting fluid recommended)
  • PCB beveling and countersinking



Carbide 4-flute countersink for PCB, copperclad, phenolics, wood, plastics, composites and non-ferrous metals

If your purchase is over US$50,
you save $5 in shipping!
    Sales Items    
Item # Description Unit Price Depth Ring Enter Qty.
EM4E8-2500-060V  60 Scoring / Engraving 4-flute Countersink 1.50in. (38mm) OAL   $27.25   
EM4E8-2500-082V  82 Scoring / Engraving 4-flute Countersink (for most flat-head and oval-head machine screws) 1.50in. (38mm) OAL   $27.25   
EM4E8-2500-090V  90 Scoring / Engraving 4-flute Countersink 1.50in. (38mm) OAL   $27.25   
EM4E8-2500-100V  100 Scoring / Engraving 4-flute Countersink 1.50in. (38mm) OAL   $27.25   
EM4E8-2500-120V  120 Scoring / Engraving 4-flute Countersink 1.50in. (38mm) OAL   $27.25   
Enter the desired quantity (Enter Qty) then click on the "Add to Cart" Button.

Open Monday - Friday, 08:30 to 16:30 Mountain Time.

Most orders received before noon ship within one business day,
subject to credit approval and item availability.
Orders with different billing and shipping
addresses may be delayed for address verification.

Sales  719 488-9640
FAX:  866-453-8473
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Updated 10/7/2016 12:32:12 PM