MQR Carbide Micro Boring Bar | Small-Hole Boring, Grooving & Threading Cutter

MQR Solid Carbide Micro Boring Bar

Micro boring bar for precision internal machining in small bores. The MQR family includes different shank sizes, nose radii and cutting lengths for boring, grooving, profiling and selected threading geometries.

How to Select

• Confirm the minimum bore diameter required by the selected tool.
• Choose the shank size that matches the holder and available bore clearance.
• Select nose radius according to the required internal profile and finish.
• Choose the shortest cutting length and overhang that can reach the feature.

Typical Applications

• Small-hole boring
• Internal profiling
• Internal grooving
• Selected internal thread forms where the tool geometry applies

MQR Carbide Micro Boring Bar

Solid-carbide micro boring bar for precision small-hole internal machining, including boring, grooving, profiling and selected threading operations depending on tool geometry.

Key Features

• Designed for small-bore machining; suitable sizes can work from approximately 2.1 mm bore diameter.
• Solid-carbide construction provides rigidity and wear resistance at small tool diameters.
• Available in multiple shank diameters, nose radii and cutting lengths for different bore sizes and reaches.
• Series geometries support boring, grooving, profiling and selected 55° / 60° thread forms where applicable.

Selection

Select the required MQR shank size, nose radius and cutting length from the variant menu. Confirm minimum bore diameter, feature geometry and required reach before ordering, and keep tool overhang as short as practical.

FAQ

What is most important with a micro boring bar?
Minimum bore size, tool overhang, holder rigidity and the required internal geometry should all be checked before machining.

View more boring cutters and micro boring bars