Precision Milling Cutters,Cutting Tools for CNC Machining Every Material
OMIST Micro Boring Bar series provides solid carbide tooling for small-bore internal machining. The product family includes different cutting geometries for internal boring, profiling, grooving, face grooving, radius grooving and internal threading, so buyers can select the tool according to the actual internal feature to be machined.
The standard coating is AlTiCrSiN. Selected series are available for minimum bores from approximately 2.1 mm, while standard shank diameters include 4, 5, 6, 7, 8 and 10 mm. Working length, overall length, nose radius and groove width vary according to tool geometry and series.
For other internal machining tool options, browse our Boring Tools or explore our Boring Bars category for related boring bar solutions.
Specification Options
The table below summarizes the main specification dimensions used for initial product selection. Exact combinations vary according to tool series and machining function.
| Specification | Available Options |
| Tool Material | Solid Carbide |
| Coating | AlTiCrSiN |
| Shank Diameter | 4 / 5 / 6 / 7 / 8 / 10 mm series |
| Minimum Bore | From approx. 2.1 mm on selected series; varies by tool geometry |
| Nose Radius | R0.05 / R0.1 / R0.15 / R0.2 depending on series |
| Working Length | Multiple options depending on tool series |
| Overall Length | 50 / 60 / 75 / 100 mm options |
| Groove Width | Multiple options depending on grooving series |
| Tool Geometry | Boring / Profiling / Grooving / Face Grooving / Radius Grooving / Internal Threading |
| Compatible Workpiece Materials | Stainless steel / Mold steel / Ductile cast iron / Alloy steel |
| Custom Options | Evaluated according to bore size, machining operation and required geometry |
The complete product family includes more dimensional combinations than are practical to list on one product page. For model confirmation or quotation, provide the bore size and machining requirements so we can recommend a suitable standard or custom option.
Applications & Series Guide
We organize the Micro Boring Bar family by machining operation rather than by individual SKU. This makes it easier to select the required geometry according to the internal feature being produced.
Internal Boring
The MTR series handles small-diameter internal boring and internal turning operations. It is suitable when an existing bore needs to be enlarged or machined internally with a dedicated small-bore cutting geometry.
Because minimum bore diameter and working length vary by model, confirm the required bore diameter and bore depth before selecting the tool.
Profiling and Contouring
Profiling tools are available for internal contouring and profile machining where the cutting path is not limited to straight internal boring.
Because internal profiling geometries vary according to the required workpiece profile and available machining space, select the tool based on the required geometry and application drawing where available.
Internal Grooving
The MGR series handles internal grooving in small bores.
Groove width and tool dimensions vary within the series. For selection or quotation, provide the required groove width, bore diameter, bore depth and groove position.
Face and Radius Grooving
The product family also includes cutting geometries for face grooving and radius or profile grooving.
These operations require different cutting-head shapes from standard internal boring. Therefore, select the suitable geometry according to groove location, profile form, bore size and available machining space rather than by shank diameter alone.
Internal Threading
The MIR series is available for small-hole internal threading applications.
Confirm the required internal thread geometry and bore conditions before selecting the tool. For non-standard or application-specific requirements, a drawing is recommended for evaluation.
How to Select the Right Micro Boring Bar
1. Machining Operation
First identify whether the operation is internal boring, profiling, internal grooving, face grooving, radius grooving or internal threading. Each function requires a corresponding cutting geometry.
2. Bore Diameter and Bore Depth
Minimum bore capability varies by tool series. Selected series are available for bores from approximately 2.1 mm, but this does not apply to every cutting geometry. Bore depth also determines the working length required.
3. Workpiece Material
The confirmed application range includes stainless steel, mold steel, ductile cast iron and alloy steel. Include the workpiece material with the inquiry so that the tool requirement can be evaluated correctly.
4. Required Geometry
Specify the required nose radius, groove width, thread geometry, profile or other internal feature. If a standard option does not match the machining requirement, a custom micro boring bar can be evaluated from the application details or drawing.
Key Features
Solid Carbide Construction
The Micro Boring Bar series uses solid carbide construction. The one-piece carbide construction provides a compact tool structure for small-diameter internal machining.
AlTiCrSiN Coating
This product series uses AlTiCrSiN as its standard coating. It provides wear protection for machining applications within the confirmed workpiece-material range.
Small-Bore Machining Capability
Selected series are available for bores from approximately 2.1 mm.
The actual minimum bore depends on the cutting geometry, tool series and machining operation, so always confirm the required bore diameter during tool selection.
Multiple Internal Machining Geometries
The product family covers internal boring, profiling, internal grooving, face grooving, radius grooving and internal threading.
This allows buyers to select the cutting geometry according to the required internal feature instead of treating every operation as standard boring.
Multiple Size Options
Available series include several shank diameters, working lengths, overall lengths, nose radii and grooving options.
Not every dimensional combination is available in every geometry, so confirm the exact specifications against the required application.
Custom Manufacturing
We can evaluate custom micro boring bars according to specific machining requirements. Please provide the available application details, such as bore size, workpiece material, machining operation or drawing, and we will review the suitable standard or custom tool option.
FAQ
What is the minimum bore diameter available in this micro boring bar series?
Selected tool series are available for minimum bores from approximately 2.1 mm. The actual minimum bore varies according to tool geometry and series.
What machining operations can these micro boring tools perform?
The product family covers internal boring, profiling, internal grooving, face grooving, radius grooving and internal threading.
What workpiece materials can these solid carbide micro boring bars machine?
The confirmed application range includes stainless steel, mold steel, ductile cast iron and alloy steel.
How do I select the right micro boring bar for my application?
Start with the machining operation, then confirm the bore diameter and depth, workpiece material and required cutting geometry. For complex or non-standard internal features, provide a drawing for evaluation.
Can OMIST manufacture custom micro boring bars from customer drawings?
Yes. Custom micro boring tools can be evaluated according to the required bore size, machining operation, workpiece material and tool geometry. A drawing is recommended when available.
Send Your Micro Boring Bar Requirement
For model confirmation or a custom quotation, please send your bore diameter, bore depth, workpiece material, machining operation, required geometry and drawing if available to sales@cutterbest.com.