MSU manufactures non-micro, non-roughing corner radius end mills across GP, GPP, HPX, MH and MSM catalog series.
Choose a corner radius end mill when the tool must retain a flat cutting end and include a defined corner radius. Compare the families by diameter, corner radius, flute count, coating, material condition and application before requesting a catalog check or quotation.
Send the tool diameter, corner radius, workpiece and operation for review.
The MSU catalog contains five corner radius families and 196 catalog codes. These carbide corner radius end mills retain a flat cutting end and add a defined radius at the tool corner, a geometry also called bull nose.
Corner Rounding End Mills are different tools used to generate a radius on an external workpiece edge. See Corner Rounding End Mills for that geometry. Micro and roughing corner-radius tools are separate product groups. Catalog codes identify configurations; confirm current availability during quotation.
GPR4
GP Series
GPR4 is the 4-flute corner radius family in the GP series. Its catalog diameter range is 1 to 20 mm, with an AlCr-based condition, unequal helix geometry and a below-55-HRC boundary.
GPPR4
GPP Series
GPPR4 is the enhanced 4-flute corner radius family in the GPP series. Its catalog diameter range is 1 to 20 mm, with an AlCr-based condition below 55 HRC.
HPRX4
HPX Series
HPRX4 is the 4-flute corner radius family in the HPX series. Its catalog diameter range is 3 to 20 mm, with an AlCr-based condition below 55 HRC.
MHR4
MH Series
MHR4 is the 4-flute high-hardness corner radius family. Its catalog diameter range is 2 to 12 mm, with TiAlSi and a below-65-HRC boundary.
MSMR4
MSM Series
MSMR4 is the 4-flute stainless-and-titanium corner radius family. Its catalog diameter range is 2 to 16 mm, with ZrN and unequal helix geometry.
Use the parent Carbide End Mills page to compare all end-mill geometries. Use Square End Mills for a flat end without a specified tool corner radius, or Ball Nose End Mills for a continuous spherical cutting profile.
Compare the five families by diameter, tool corner radius, coating and catalog material boundary.
Choose the family from the catalog condition, then verify the exact diameter and corner radius combination in the model row. A family-level diameter range does not mean that every radius is available at every diameter.
Corner radius end mill catalog families compared by flute count, diameter range, catalog condition and the details to confirm next.
Catalog family
Flute count
Catalog diameter range
Catalog condition or route
What to confirm next
GPR4
4
1–20 mm
AlCr-based; unequal helix; below 55 HRC
Diameter, corner radius, lengths, workpiece and operation
GPPR4
4
1–20 mm
AlCr-based; below 55 HRC
Diameter, corner radius, lengths, workpiece and operation
HPRX4
4
3–20 mm
AlCr-based; below 55 HRC
Diameter, corner radius, workpiece and operation
MHR4
4
2–12 mm
TiAlSi; below 65 HRC
Workpiece grade, hardness, diameter, radius and operation
MSMR4
4
2–16 mm
ZrN; unequal helix; stainless-steel and titanium route
Exact material grade, diameter, radius, operation and coolant
The exact catalog row controls diameter, corner radius, cutting length, reach, shank and overall length. Coating names and hardness boundaries are catalog conditions, not universal performance statements. For coating selection factors, review the End Mill Coating Guide.
Continue to the part geometry, workpiece and setup information required for selection.
Choose Corner Radius End Mills for Your Application
Use this geometry when the programmed tool needs a flat end together with a defined tool corner radius. Requests may include profiling, shoulder features and semi-finishing operations, but the part geometry, engagement and acceptance requirement must be reviewed before the tool is selected. Use the End Mill Selection Guide to review geometry, workpiece material and setup. Provide the following inputs together:
Part drawing or a clear description of the flat and radiused features.
Workpiece material, grade and hardness when known.
Operation, stock condition and required result.
Tool diameter and corner radius as separate dimensions.
Cutting length, reach, shank and overall-length constraints.
Coating requirement, machine, spindle interface, holder and coolant method.
Submit the drawing when a required diameter-radius or length combination is not confirmed in the catalog.
Related geometries
Do not use the tool corner radius as a substitute for a full ball-nose profile; use Ball Nose End Mills when a continuous spherical cutting profile is required. To generate a radius on an external workpiece edge, use Corner Rounding End Mills instead.
Custom review
If the required diameter, radius, length or body geometry is not confirmed in the catalog, submit the drawing through Custom Cutting Tools for feasibility review. The review does not guarantee that every combination can be manufactured.
Send the diameter and tool corner radius as separate values with the workpiece and operation.
The current Corner Radius End Mills catalog contains 196 catalog codes across five families. Compare the available family and model-code choices in the table below.
Corner radius end mill series with family code, catalog name, exact code count and catalog diameter range.
Series
Family
Catalog name
Exact code count
Catalog range
GP
GPR4
General Processing 4-Flute Corner Radius End Mill
58
1–20 mm
GPP
GPPR4
Enhanced 4-Flute Corner Radius End Mill
48
1–20 mm
HPX
HPRX4
High Performance 4-Flute Corner Radius End Mill
45
3–20 mm
MH
MHR4
High Hardness 4-Flute Corner Radius End Mill
21
2–12 mm
MSM
MSMR4
Stainless & Titanium 4-Flute Corner Radius End Mill
24
2–16 mm
For the exact model, confirm the catalog code, cutting diameter, corner radius, cutting length, reach, shank diameter, overall length, flute count, coating and published material or hardness condition.
The Downloads page provides the current MSU carbide end mill catalog. When a requested diameter-radius combination is not visible in the catalog information, MSU checks the applicable catalog row or drawing before selection or quotation.
Open the current carbide end mill catalog and its corner-radius dimensional tables.
Corner Radius End Mills are an MSU-manufactured product line. The current catalog establishes the five family names, 196 model codes, dimensions and catalog conditions in this range.
The MSU Factory has Walter HELITRONIC MICRO equipment. MSU’s Quality Control facilities include a ZOLLER G3 measurement system. The selected diameter, corner radius and other acceptance requirements are confirmed against the catalog row, order or approved drawing.
Product-specific radius tolerances, runout, surface-finish requirements and inspection items are confirmed for the selected model, order conditions or approved drawing.
Review how tool dimensions, inspection requirements and acceptance criteria are confirmed for the selected configuration and order.
Send the family or catalog code when known. State the tool diameter and corner radius separately, then add cutting length, reach, flute count, coating, workpiece and hardness, operation, machine and holder, coolant, quantity, destination and target date.
Minimum order and samples
MOQ is normally 5–10 pieces, with the final quantity confirmed by product and quotation. Samples are charged according to the product, and sample freight is paid by the customer.
Lead time
Completion of the whole order is guaranteed within 25–30 days from order placement.
Payment
T/T with deposit and balance is supported. The percentages and payment milestones are stated in the quotation or order. Quotations remain valid for 30 days.
Trade terms
EXW, FOB, CIF and DDP can be discussed and are confirmed by order, destination and feasibility. Packaging is confirmed in the quotation or order.
After-sales
For an issue after receipt, submit it within 30 days and include applicable photos, batch number, measurement report or video. MSU reviews each issue against the supplied evidence and order record.
It is the defined radius between the tool's flat cutting end and its peripheral cutting edge. State it separately from the tool diameter.
Bull nose and corner radius end mills refer to the same general geometry: a flat cutting end with a radius at the tool corner. The MSU range contains five families.
A corner radius end mill retains a flat cutting end with a defined tool corner radius. A ball nose end mill has a continuous spherical cutting profile.
No. A corner radius end mill describes the radius built into the tool corner. A corner rounding end mill is selected to generate a radius on an external workpiece edge.
MSMR4 is the published stainless-and-titanium corner-radius route, with ZrN, unequal helix geometry and a 2–16 mm catalog diameter range. The exact material grade, diameter-radius combination, operation and coolant still require review.
Yes. Submit the drawing or complete dimensions for feasibility review. The review does not guarantee every radius, tolerance, substrate, coating or length combination.
Completion of the whole order is guaranteed within 25–30 days from order placement.
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