Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides
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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
Carbide 4-flute countersink for PCB, copperclad, phenolics, wood, plastics, composites and non-ferrous metals

Get $5 off shipping on Web Orders over US$50!
Depth setting ring
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   
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