The versatile 391.37AB system can be used for both fine boring and face grooving applications. It allows precision adjustment in microns in order to achieve close hole tolerances. Build modular assemblies with Coromant Capto® or HSK for increased tooling flexibility.
Fine-adjustable heads and sleeves
Benefits
Choose between conventional (.37A) and high speed (.37B) fine-adjustable head
Flexible solution for a broad diameter range
Excellent surface finish with wiper inserts
Close hole tolerances of IT6
Features
Diameter adjustment by 0.002 mm (0.00008 inch) for high accuracy
The high speed fine boring heads have an adjustable counterweight, which enables runs at 20 000 revmin
Reduction sleeves available from size 20 to 16

The versatile 391.37AB system can be used for both fine boring and face grooving applications. It allows precision adjustment in microns in order to achieve close hole tolerances. Build modular assemblies with Coromant Capto® or HSK for increased tooling flexibility.
Fine-adjustable heads and sleeves
Benefits
Choose between conventional (.37A) and high speed (.37B) fine-adjustable head
Flexible solution for a broad diameter range
Excellent surface finish with wiper inserts
Close hole tolerances of IT6
Features
Diameter adjustment by 0.002 mm (0.00008 inch) for high accuracy
The high speed fine boring heads have an adjustable counterweight, which enables runs at 20 000 revmin
Reduction sleeves available from size 20 to 16