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CoroBore® BR10

Back boring considerations

When back boring, diameter range will be changed. Take care that the protrusion length of the assembly will not cause any collision.


​Always use a torque wrench and apply recommended torque on screws for insert and tool assembly torque.

Replace worn items

​Replace worn or exhausted screws, washers and cup springs. It is recommended to replace the cup springs used when clamping the slides every 5th use to keep the pre-clamping functionality in place, while setting the diameter in the pre-setter.

Lubricate once a year

​Lubricate all assembly items with oil at least once a year.

Handling instruction CoroBore rough boring


​Check machine spindle, run-out, wear and clamping force.

Clean assembly items

​Clean all assembly items before assembly. Check inserts and insert seats regularly so they are free from dirt and not damaged.​

Application tips

Tool setting for back boring

• Remove grub screw from top cutting fluid outlet and attach it into lower cutting

• Fluid outlet in order to get correct coolant position

• Rotate cartridge 180°

• Use slide extension if needed

• Reverse rotation direction

Initial considerations

Make sure the boring tool will go through the hole with the shoulder and that the front of the boring tool will not collide with the component.
When back boring, the boring tool is configured to go through a hole with minimum diameter of DC/2 + BD1/2.

Weak machines

When roughing, make sure the machine has the required power and torque needed for the specific boring application. Feed, number of inserts, hole diameter and depth of cut are main affecting parameters.


Cutting data

General recommendations rough boring:

  • Starting data: vc 200 m/min (valid when vc on insert box is bigger than vc 200 m/min) at short overhang. Check insert box for feed and depth of cut recommendations
  • vc = 50% of recommended data on label. If vibrations occur, reduce speed and increase feed. Do not use max recommended feed and ap at the same time.

Tightening torque

Insert screw

ISO ANSI Non ISO Code Size Torx Plus Nm Ft/lbs
CC06 CC2(1.5)   5513 020-03 M2,5 7IP 0.9 0.7
CC09 CC09   5513 020-09 M3,5 15IP 3.0 2.2
CC12 CC43   5513 020-17 M4x0,5 15IP 3.0 2.2
  SP06 5513 020-33 M2,2 7IP 0.8  0.59
SP08 5513 020-57 M3 9IP 1.7  1.25
SP12 416.1-833 M3,5 10IP 2 1.48 
SP18 5513 020-25 M4 15IP 3 2.2
SN15 SN54   5512 086-03 M6 20IP 6.4 4.7

Cor​oBore® BR10

  Insert 90°
Size DCN (mm) DCX (mm) ISO ANSI Nm Ft/lbs Screw size
A 32 38 CC06 CC2(1.5) 4.8 3.5 M 4
B 37 45 CC06 CC2(1.5) 4.8 3.5 M 4
C 44 54 CC06 CC2(1.5) 9 6.6 M 5
D 53 65 CC06 CC2(1.5) 16 11.8 M 6
DX 64 76 CC09 CC3(2.5) 16.0 11.8 M 6
E 75 91 CC12 CC43 38.0 28.0 M 8
F 90 110 CC12 CC43 75 55.3 M 10
G 109 136 CC12 CC43 75 55.3 M 10
H 135 170 CC12 CC43 75 55.3 M 10

Tool holding

Bending stiffness and torque transmissions are the most important factors when choosing a tool holder for boring operations. First choice should always be tools with Coromant Capto® coupling, which offers excellent repeatability and the best stability characteristics on the market.​​​​

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