In this chapter we will describe the tool holder identification coding system.

- Click below to learn more about each part of the code!

Method of holding

The letter P indicates a lever lock type clamp method.

Insert geometry

Geometries including triangle, square, round, polygon and rhombus are standard. All of the insert geometries are symbolized using the alphabet.

Cutting edge angle

Insert clearance

The symbol represents the clearance angle of the insert used. An insert with a 0° clearance angle, which is shown by the symbol N, is called a negative insert. An insert with a clearance angle other than 0° is called a positive insert. Many turning inserts have clearance angles shown by symbols N, C and P.

Hand

The symbols represents the hand of the tool.

Shank cross section

The cross-section of the tool holder is shown by its height (left) and the width (right).

Shank cross section

The cross-section of the tool holder is shown by its height (left) and the width (right).

Shank length

The symbol represents the length of the tool shank.

Cutting edge length

For the inch coding method, the diameter of an inscribed circle is shown by a numerical symbol.

For example, an inscribed circle of 9.525 mm (3/8 inch) is represented by the symbol 3. An inscribed circle of 12.70 mm (4/8 inch) is shown as 4.

However, for the metric coding, the diameter of an inscribed circle is represented by the cutting edge length using a two-digit number. Therefore, even if the inscribed circle is the same , the symbol for the cutting edge will vary.

Insert thickness

For a tool holder on which the shim thickness can be changed, the symbol

for insert thickness may be omitted. The symbol represents the actual

thickness of the insert.

It works on the same principle as that of the inscribed circle.