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CoroTap® 300

The hole

For basic hole size calculations, use the appropriate formulas for cutting taps.

D = Hole diameter (mm, inch)
TD = Nominal thread diameter (mm, inch)
TP = Thread pitch (mm, inch)

  • Drill size for M10 × 1.5 cutting tap = 10-1.5 = 8.5 mm

The component

When the hole is analyzed, have a look at the workpiece material, component shape and quantity

  • Machinability?
  • Material hardness?
  • Alloy elements?

The machine

The machine influences:
  • The type of operation
  • Which type of tool holders and/or collets to use
Always consider:
  • Machine stability
  • Spindle speed
  • Coolant volume and concentration
  • Workpiece clamping

Tool holding

The CoroChuck™ 970 is designed for stable and precise tapping in all materials. It improves tap tool life and surface quality, and offers the highest process security.

Keys to a successful tapping operation

To ensure a good tapping operation and a high-quality finished product, follow these steps.

Threading chamfer type

The type of hole to be tapped determines which chamfer type is best suited for use. There are two different chamfer types: C and E.

Which tap and cutting speed should you choose?

General speeds can be found in the catalog; consider the recommendation as a safe start value


Coolant is critical to a successful tapping operation. The coolant supply influences chip evacuation, thread quality and tool life.

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