CM7 1/4" Round Inserts
CM7 Round Inserts
The CM7 round insert are used exclusively in the popular MITE-E-MARK model 78 air impact marker. These 1/4" diameter inserts are made in the USA from qulity tool steel.
Tooling that uses the CM7 round inserts.
- Standard =
- CM7X inserts are used in the Model 78 - "OB" rod
- High Vibration Applications =
- CM7G inserts are used in the Model 78 - "GB" rod
- Wide Head =
- CM7Y inserts are used in the Model 78 - "OY" rod
The CM – round inserts are used for indention marking and are held in the stamp recess/holder with spring clip or set screw. Round inserts are frequently used to provide station ID and part tracking QC marks. Round inserts always center the mark in the tool holder.



Columbia Marking Tools CM7 1/4" Round Inserts
Comprehensive guide for round inserts.

Char Size – Measured from the top of the character.
Char Width – All sizes are Style 3A, width is 60% of the character size.
Except 3/16” character size style 2A, width 50% of the character size.
Tolerance - +.000”/-.001” on all dimensions.


Char Size – Measured from the top of the character.
Char Width – All sizes are Style 3A, width is 60% of the character size.
Except 3/16” character size style 2A, width 50% of the character size.
Tolerance - +.000”/-.001” on all dimensions.



Standard CM7X Round Inserts are engraved as sharp face characters. This type of face style is engraved with a sharp edge. A sharp face tool penetrates more easily than other styles.
Build Catalog Number as shown:


Dot Style Characters are engraved with a series of conical dots for the lowest possible stress when marking. Recommended for high pressure fittings, aircraft, and other parts where sharp tools might disrupt the molecular structure of the metal.


Multi-character round inserts are great for static marking lengends and QC marks.


Char Size – Measured from the top of the character.
Char Width – All sizes are Style 3A, width is 60% of the character size.
Except 3/16” character size style 2A, width 50% of the character size.
Tolerance - +.000”/-.001” on all dimensions.


Char Size – Measured from the top of the character.
Char Width – All sizes are Style 3A, width is 60% of the character size.
Except 3/16” character size style 2A, width 50% of the character size.
Tolerance - +.000”/-.001” on all dimensions.


Important Notes
- The model 78 has limited force and it is best to review the parameters for marking before purchasing a Custom CM7Y insert.
- The CM7Y is a great insert for Tier style marking of small characters. Example: 1 above 2 in 1/16” characters
- The CM7Y can be purchased as an “Anvil”. The blunt force can be used for non-marking assembly operations, or to provide the force needed to mark characters sitting on the reverse side of the part from the marker.


Char Size – Measured from the top of the character.
Tolerance - +.000”/-.001” on all dimensions.
