超硬合金製ブルノーズエンドミル
Bull nose end mills—also known as corner radius end mills—combine a flat cutting end with rounded corners for CNC milling, side cutting, pocketing and semi-finishing.
Explore 2-flute and 4-flute R-series cutter families, compare corner radius dimensions, and select a tool by workpiece material and length.
Bull Nose vs Square vs Ball Nose End Mills
A bull nose end mill has a flat cutting end with a corner radius. Compare the tool shapes to match the cutting edge to your machining operation.
スクエアエンドミル
Sharp corners, flat end. For flat-bottom pockets, slots and square shoulders.
Square end mills →Bull Nose / Corner Radius
Radiused corners, flat end. For side milling, pocketing and semi-finishing where corner strength matters.
ボールノーズエンドミル
Fully rounded tip. For 3D contours, curved surfaces and mold profiles.
Ball nose end mills →A corner rounding cutter is a separate form tool for rounding a workpiece edge, not the same tool geometry as a bull nose end mill.
Bull Nose End Mill Dimensions: D, d, R, H & L
Read the Dimension Drawing
When requesting a tool, specify D, d, R, H and L, together with your workpiece material and required quantity.
View Product Families →Choose 2-Flute or 4-Flute Corner Radius End Mills
Choose by flute count and workpiece material. Selected families include a representative dimensional example to help you narrow your choice before requesting specifications.
2-Flute Bull Nose End Mills HMQ-2R
Provides greater flute space for chip evacuation. The current standard R-series range includes the HMQ-2R family with length variants.
4-Flute Corner Radius End Mills 8 Families
Four cutting edges suit applications where edge support and stable milling are important; choose a series specifically matched to your material.
Economical series for steel / aluminum
Economical series for steel / aluminum
High-performance steel / stainless steel
General-purpose machining for carbon steel, alloy steel, stainless steel, cast iron and hardened steel below HRC 40.
High-efficiency stainless steel / titanium
High-efficiency steel / stainless steel
High-speed high-hardness machining
High-temperature alloys / titanium
Super-high-hardness machining
Sizes shown are representative examples in millimeters. Please confirm your required D, d, R, H and L when requesting a quotation.
Corner Radius End Mills by Workpiece Material
Select the tool family according to the alloy, hardness, machining operation and required corner radius. Series descriptions are a starting point; final suitability depends on the individual tool specification.
HMM is a general-purpose option; compare the cutting strategy and tool geometry with the steel grade.
HMM also covers stainless steel in general-purpose machining. Select for work hardening, chip control and cutting conditions.
General-purpose cast iron machining is included in the HMM application range.
HMM applies only below HRC 40. For higher hardness, review a dedicated hardness-focused series against the actual material grade.
Compare flute space, chip evacuation and the workpiece alloy before selecting a corner radius tool.
Choose the material-specific family and confirm the exact operating conditions for difficult-to-machine alloys.
How to Choose Corner Radius and Length
The required part geometry comes first: R must fit the machined feature. Length selection also affects tool deflection and stability.
Corner Radius R
- Smaller R: suitable where part geometry requires a tighter corner; verify edge strength for the intended operation.
- Larger R: offers more material at the corner, but must still clear the workpiece geometry.
- Non-standard R: provide a drawing for feasibility review rather than assuming standard availability.
Tool Length & Overhang
- Use the shortest practical extension for rigidity.
- Check both cutting length H および全長 L.
- Tool-holder clearance and actual usable reach require separate verification.
スタンダード
Standard-length corner radius end mill family.
ロング
Longer design for additional accessibility. Confirm the corresponding H and L dimensions.
Extra-Long
Extended tool configuration; assess overhang, deflection and tool-holder clearance.
Request Bull Nose End Mill Pricing & Specifications
Send your corner radius end mill requirements for a product recommendation and quotation.
- Product family or order number, if known
- Cutting diameter D, shank diameter d, radius R, cutting length H and overall length L
- Workpiece material, hardness, quantity and drawing where available
価格・仕様のお問い合わせ
可能であれば、モデル名、用途、数量をご記入ください。.
