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MSU-Manufactured Carbide End Mills

Corner Radius End Mills

Choose corner radius end mills when your part needs a flat cutting end with a defined radius at the tool corner. MSU manufactures carbide corner radius end mills in GP, GPP, HPX, MH and MSM families.

Match the tool diameter and corner radius to the drawing, then compare reach, workpiece material and the selected family’s specifications.

Send the required diameter and tool corner radius, together with the workpiece material and operation, for help narrowing the selection.

Get Corner Radius Selection Help

Explore Corner Radius End Mills

Also called bull nose end mills, these tools combine a flat end with a rounded tool corner. The standard range includes five 4-flute families and 196 model codes.

The broader Carbide End Mills range includes other end forms and specialist geometries.

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GPR4

GP · GPR4

Diameters 1–20 mm, an AlCr-based coating designation and unequal helix geometry. Listed for material below 55 HRC.

GPPR4

GPP · GPPR4

The enhanced GPP series offers diameters 1–20 mm with an AlCr-based coating designation, for material below 55 HRC.

HPRX4

HPX · HPRX4

Diameters 3–20 mm with an AlCr-based coating designation, for material below 55 HRC.

MHR4

MH · MHR4

Diameters 2–12 mm, TiAlSi and a listed material range below 65 HRC. Compare this family for hardened-steel requirements.

MSMR4

MSM · MSMR4

Diameters 2–16 mm, ZrN and unequal helix geometry. The current product specification lists stainless-steel and titanium applications; match the exact grade and operation to the selected model.

For a flat end without a specified tool corner radius, compare Square End Mills. A Ball Nose End Mill has a fully rounded cutting profile. For rounding an external workpiece edge, use Corner Rounding End Mills.

Compare flute count, diameter range and material suitability to narrow down the family for your part.

Compare Corner Radius Families

Compare Series and Configurations

Use the material range to shortlist a family, then check the available diameter and corner-radius combination. A diameter range does not mean that every corner 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.
Family Flute count Diameter range Coating, geometry and material range Selection details
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 applications Exact material grade, diameter, radius, operation and coolant

Compare the selected tool’s cutting length, reach, shank and overall length together. The End Mill Coating Guide explains coating selection factors; the coating and material range for your order remain those specified for the exact model.

Check the corner radius against the drawing, then confirm cutting length, reach and clearance.

Match the Tool to Your Part

Choose the Diameter, Radius and Reach

Start with the feature you need to machine. The diameter and corner radius describe different parts of the cutting profile, while cutting length and reach determine how the tool can access the feature.

  1. Diameter and tool corner radius. State both dimensions. Check the radius against the part drawing and toolpath; a flat end with a corner radius does not replace a full ball-nose profile.
  2. Cutting length and access. Distinguish the length of the cutting edges from overall tool length. Check the required reach, shank and clearance around the feature.
  3. Material and operation. Match the grade and hardness to the family, then include the operation, engagement and required part result.
  4. Machine setup. Check holder fit, overhang and coolant delivery. Include the current tool and machining conditions if you are investigating wear, vibration or finish.
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Match the Workpiece Material

For material-specific guidance, compare Steel & Pre-Hardened Steel Milling for GPR4, GPPR4 and HPRX4, Hardened Steel Milling for MHR4, and the relevant Stainless Steel Milling or Titanium Alloy Milling conditions when considering MSMR4.

Geometry and Custom Dimensions

The End Mill Selection Guide covers the wider geometry and setup checks. If the required diameter, radius or reach is outside the standard combinations, submit a dimensioned drawing for Custom Cutting Tools assessment.

Have a specific diameter and radius in mind? Include the feature depth and required reach with your enquiry.

Ask About a Diameter and Radius

Model Codes and Dimensions

The range below identifies the standard families and model counts. For an order, specify the full model code with the required diameter and corner radius.

Corner radius end mill series with family code, catalog name, exact code count and catalog diameter range.
Series Family Catalog name Model codes Diameter 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
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The complete specification includes cutting diameter, corner radius, cutting length, reach, shank diameter, overall length, flute count, coating and the stated material or hardness range.

Find the dimensional tables in the carbide end mill catalog. If a required combination is not listed, send the dimensions or drawing with your enquiry so availability or custom feasibility can be checked.

Find the complete tool code and dimensional table for the configuration you need.

View the End Mill Catalog

Manufacturing and Quality Control

MSU manufactures these corner radius end mills. Its Factory has Walter HELITRONIC MICRO equipment, and the Quality Control facilities include a ZOLLER G3 measurement system.

Specify the tool diameter, corner radius and any critical length or tolerance on the order or approved drawing. Required radius tolerances, runout, surface finish and inspection items are agreed for the selected model and order.

State the characteristics and records your acceptance process requires before quotation, so the inspection requirements can be confirmed with the tool specification.

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Identify the critical tool dimensions and inspection records required for acceptance.

Discuss Inspection Requirements

Quotations and Ordering Support

Send the model code and quantity if you already know the tool. If you need selection help, start with the diameter, corner radius, workpiece and operation; include a drawing for a nonstandard feature or reach.

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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.

Order Completion

Completion of the whole order is guaranteed within 25–30 days from order placement. Transport time and arrival dates are confirmed separately.

Payment and Shipping

T/T with deposit and balance is supported. Percentages and milestones are stated in the quotation or order. Quotations remain valid for 30 days. EXW, FOB, CIF and DDP can be discussed according to the order and destination; packaging is confirmed in the quotation or order.

After-Sales Support

Report an issue within 30 days after receipt, with applicable photos, batch details, a measurement report or video. MSU assesses it against the order and supplied evidence.

Contact Maria at maria@msutools.com or +86 13973369578 by phone or WhatsApp, or send an enquiry through Contact MSU. See Ordering and Delivery for purchasing details.

Check purchasing terms and distinguish order completion from transport time before arranging delivery.

View Ordering and Delivery

Corner Radius End Mill Questions

It is the radius between the flat cutting end and the peripheral cutting edge. Specify it separately from the tool diameter.

The terms describe the same general end geometry: a flat end with a rounded tool corner. Check the specified radius and complete dimensions for the tool you need.

A corner radius end mill keeps a flat cutting end. A ball nose end mill has a fully rounded end profile. Match the profile to the drawing and toolpath.

For an external edge-rounding operation, compare a corner rounding end mill. Its cutting profile differs from the radius built into the corner of a bull nose end mill.

MSMR4 is listed with ZrN, unequal helix geometry and diameters of 2–16 mm. Confirm the exact material grade, diameter-radius combination, operation and coolant for the selected model.

Yes. Send the drawing or complete dimensions. MSU assesses the radius, length, tolerance, substrate and coating together before confirming whether the combination can be made.

Completion of the whole order is guaranteed within 25–30 days from order placement. Transport time and arrival dates are confirmed separately.