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R8 (16MM) Steel Chamfer Cutter carbide end milll
$566.28 USD
BEYOND R8 (16MM) Steel Arc Chamfer Cutter Brand: BEYOND Type: Arc Type Double-Sided Chamfer Cutter Model: R8 (16MM) Product Overview The BEYOND R8 (16MM) Steel Arc Chamfer Cutter is specially...
R6 (12mm) Steel Arc Up & Down Chamfercarbide end milll
$103.77 USD
BEYOND R6 (12mm) Steel Arc Up & Down Chamfer End Mill – Dual-Sided Edge Chamfering Cutter The BEYOND R6 (12mm) Steel Arc Chamfer End Mill is a professional-grade cutting tool...
R5 (10mm) Steel Arc Up & Down Chamfer carbide end milll
$261.27 USD
BEYOND R5 (10mm) Steel Arc Up & Down Chamfer End Mill – Double-Sided Edge Chamfering Cutter The BEYOND R5 (10mm) Steel Arc Chamfer End Mill is engineered for efficient and...
R4 (8mm) Steel Chamfer End Mill carbide end milll
$227.04 USD
BEYOND R4 (8mm) Steel Chamfer End Mill – Arc Type Up & Down Chamfer Cutter The BEYOND R4 (8mm) Steel Chamfer End Mill is a high-performance cutting tool designed for...
R3 (6mm) Steel Chamfer carbide end milll
$133.53 USD
BEYOND R3 (6mm) Steel Chamfer End Mill – Arc Type Up & Down Chamfer Cutter The BEYOND R3 (6mm) Steel Chamfer End Mill is designed for precise edge finishing, chamfering,...
R2.5 (5mm) Steel Chamfer carbide end milll
$131.58 USD
BEYOND R2.5 (5mm) Steel Chamfer End Mill – Arc Type Up & Down Chamfer Cutter The BEYOND R2.5 (5mm) Steel Chamfer End Mill is engineered for high-precision chamfering and deburring...
R2 (4mm) Steel Chamfer carbide end milll
$113.22 USD
BEYOND R2 (4mm) Steel Chamfer End Mill – Arc Type Up & Down Chamfer Cutter The BEYOND R2 (4mm) Steel Chamfer End Mill is specially designed for precision chamfering and...
R1.5 (3mm) Steel Arc Chamfer Cutter carbide end milll
$103.92 USD
BEYOND R1.5 (3mm) Steel Arc Chamfer Cutter High-Precision Double-End Radius End Mill for Steel Chamfering and Edge Finishing The BEYOND R1.5 (3mm) Steel Arc Chamfer Cutter is a high-performance CNC...
R1 (2mm) Steel Arc Chamfer Cutter carbide end milll
$94.02 USD
BEYOND R1 (2mm) Steel Arc Chamfer Cutter Precision Double-End Radius End Mill for Steel Chamfering and Deburring The BEYOND R1 (2mm) Steel Arc Chamfer Cutter is designed for high-precision edge...
R8 (16mm) Aluminum Arc Chamfer Cutter carbide end milll
$427.98 USD
BEYOND R8 (16mm) Aluminum Arc Chamfer Cutter Heavy-Duty Double-End Radius End Mill for Aluminum CNC Chamfering and Edge Rounding The BEYOND R8 (16mm) Aluminum Arc Chamfer Cutter is designed for...
R6 (12mm) Aluminum Arc Chamfer Cutter carbide end milll
$246.42 USD
BEYOND R6 (12mm) Aluminum Arc Chamfer Cutter Precision Double-End Radius End Mill for Aluminum CNC Edge Rounding The BEYOND R6 (12mm) Aluminum Arc Chamfer Cutter is designed for professional CNC...
R5 (10mm) Aluminum Arc Chamfer Cutter carbide end milll
$207.33 USD
BEYOND R5 (10mm) Aluminum Arc Chamfer Cutter Professional Double-End Radius End Mill for CNC Edge Rounding and Chamfering The BEYOND R5 (10mm) Aluminum Arc Chamfer Cutter is specially designed for...
R4 (8mm) Aluminum Arc Chamfer Cutter carbide end milll
$173.10 USD
BEYOND R4 (8mm) Aluminum Arc Chamfer Cutter Professional Double-End Radius End Mill for Aluminum CNC Machining The BEYOND R4 (8mm) Aluminum Arc Chamfer Cutter is designed to deliver excellent performance...
R3 (6mm) Aluminum Arc Chamfer Cutter carbide end milll
$108.87 USD
BEYOND R3 (6mm) Aluminum Arc Chamfer Cutter High-Precision Double-End Radius End Mill for CNC Aluminum Machining The BEYOND R3 (6mm) Arc Chamfer Cutter is specially designed for precision CNC machining...
R2.5 (5mm) Aluminum Corner Rounding carbide end milll
$97.41 USD
BEYOND R2.5 (5mm) Aluminum Corner Rounding End Mill – Arc Type Chamfer Cutter The BEYOND R2.5 (5mm) Aluminum Corner Rounding End Mill is designed for high-precision edge rounding, deburring, and...
R2 (4mm) Aluminum Corner Rounding carbide end milll
$89.04 USD
BEYOND R2 (4mm) Aluminum Corner Rounding End Mill – Arc Type Chamfer Cutter The BEYOND R2 (4mm) Aluminum Corner Rounding End Mill is specifically designed for precise edge rounding and...
R1.5 (3mm) Aluminum Corner Rounding carbide end milll
$84.12 USD
BEYOND R1.5 (3mm) Aluminum Corner Rounding End Mill – Arc Type Chamfer Cutter The BEYOND R1.5 (3mm) Aluminum Corner Rounding End Mill is engineered for high-efficiency machining of aluminum and...
R1 (2mm) Aluminum Corner Rounding carbide end milll
$77.64 USD
BEYOND R1 (2mm) Aluminum Corner Rounding End Mill – Arc Type Chamfer Cutter The BEYOND R1 (2mm) Aluminum Corner Rounding End Mill is designed for high-speed precision machining of aluminum...
Quick Links — Arc Chamfer Cutters (R1-R8)
BEYOND Arc Chamfer Cutters (R1-R8 · Steel + Aluminum)
BEYOND brand solid-carbide arc chamfer cutters with convex corner radius R1 through R8mm. Each radius ships in two grades: a steel-grade with TiAlN coating for steel / stainless / alloy steel, and an aluminum-grade with mirror-polished uncoated flutes for aluminum / copper / brass. Arc profile geometry gives smoother cuts and lower vibration than square-end chamfer mills.
Corner Radius (R)
R1 / R1.5 / R2 / R2.5 / R3 / R4 / R5 / R6 / R8
R1 to R8 mm coverage
Workpiece Coverage
Steel + Aluminum Dual-Grade
Two grades per radius
Body Diameter (D)
2 - 16 mm
D = 2 × R (constant)
Profile Type
Arc / Convex Radius
Smooth low-vibration cutting
Trusted by small workshops, individual machinists & garage CNC users worldwide
1 piece welcome · WhatsApp reply within 2 hours · 3-7 day global shipping via DHL / UPS / FedEx
1 piece welcome · WhatsApp reply within 2 hours · 3-7 day global shipping via DHL / UPS / FedEx
What Is an Arc Chamfer Cutter?
An arc chamfer cutter (also called a corner-rounding end mill) has a convex hemispherical tip with a defined radius R. As it traverses an edge, the cutter produces a smooth rounded profile of matching radius, replacing sharp 90° corners with a stress-relieving arc. Compared to a square-end chamfer mill (which leaves a flat-bottomed notch), the arc profile:
- Reduces stress concentration at the corner — critical for parts subject to fatigue loading or impact.
- Eliminates chipping on brittle materials (hardened tool steel, cast iron, ceramic-coated parts).
- Improves surface finish on the rounded transition — no sharp tooling marks.
- Lowers vibration / chatter — the spherical cutting edge has continuous tooth engagement.
The body diameter D of the cutter equals 2 × R (e.g. R4 cutter has D = 8mm body), which is the standard for corner-rounding geometry. This means a single R4 cutter can profile a corner that a square end mill cannot reach without multiple step-down passes.
Why Choose Our Arc Chamfer Cutters
Steel + Aluminum Dual Grade
Each radius available in two grades: steel-grade TiAlN-coated and aluminum-grade mirror-polished. Pick the right cutter for your workpiece without compromise.
Full R1-R8 Range
9 standard radii from R1 to R8 cover virtually any chamfer or fillet requirement — no need to source specialty sizes.
Aluminum-Grade Mirror Polish
Aluminum SKUs feature hand-polished flutes for built-up-edge elimination. Run higher Vc on aluminum without chip welding.
Arc Profile Stress Relief
Convex tip geometry reduces vibration, improves surface finish, and removes sharp-corner stress risers on parts subject to fatigue.
Steel-Grade vs Aluminum-Grade Comparison
Same radius, two different cutter designs. Choosing the right grade for your workpiece material is the difference between a clean chamfer and a BUE disaster. Quick comparison:
| Design Element | Steel-Grade (R1-R8) | Aluminum-Grade (R1-R8) |
|---|---|---|
| Coating | TiAlN | None (uncoated polished) |
| Flute surface | Standard ground | Mirror-polished |
| Helix angle | 30-45° | 55° (steep) |
| Vc range | 60-150 m/min | 150-300 m/min |
| fz per tooth | 0.02-0.06 mm | 0.04-0.10 mm |
| Coolant | Flood (mandatory for stainless) | MQL or flood |
| Workpiece | Steel, stainless, alloy steel, cast iron | Aluminum, copper, brass, non-ferrous |
| Price range | $94 - $566 (R1 to R8) | $78 - $428 (R1 to R8) |
For T-slot profile cutting in steel, see our steel-grade T-slot cutter collection. For T-slot profile cutting in aluminum, see our aluminum-grade T-slot cutter collection.
Radius Selection Guide (R1-R8)
All standard radii ship within 24 hours from our Hangzhou warehouse. Pick the radius R that matches your design requirement — the body diameter D will be 2 × R automatically.
| Radius R | Body Diameter D | Typical Application | View Steel | View Aluminum |
|---|---|---|---|---|
| R1 | 2 mm | Light edge break, PCB tooling, jewellery | steel R1 | aluminum R1 |
| R1.5 | 3 mm | Standard chamfer on small parts | steel R1.5 | aluminum R1.5 |
| R2 | 4 mm | General edge break, mould inserts | steel R2 | aluminum R2 |
| R2.5 | 5 mm | Medium fillet, sheet-metal edges | steel R2.5 | aluminum R2.5 |
| R3 | 6 mm | Standard fillet, structural parts | steel R3 | aluminum R3 |
| R4 | 8 mm | Heavy edge break, mould base corners | steel R4 | aluminum R4 |
| R5 | 10 mm | Large fillet, jig / fixture corners | steel R5 | aluminum R5 |
| R6 | 12 mm | Heavy fillet, structural weld prep | steel R6 | aluminum R6 |
| R8 | 16 mm | Maximum fillet, large mould base corners | steel R8 | aluminum R8 |
Workpiece Materials Covered
Each grade is optimized for its target material family. Use this table to pick the right cutter for your job:
| Cutter Grade | Best For | Common Forms | Vc Start |
|---|---|---|---|
| Steel-grade (R1-R8) | Carbon steel, alloy steel, tool steel | 1018 / 4140 / 42CrMo / SKD11 / D2 | 60-90 m/min |
| Steel-grade | Stainless steel | 304 / 316 / 17-4 PH | 40-70 m/min |
| Steel-grade | Cast iron | GG25 / GGG40 / ductile iron | 70-110 m/min |
| Aluminum-grade (R1-R8) | Wrought aluminum alloys | 6061-T6 / 7075-T6 / 2024-T3 | 180-300 m/min |
| Aluminum-grade | Cast aluminum | A356 / A380 | 120-200 m/min |
| Aluminum-grade | Copper / brass | C110 / C360 / C464 | 100-250 m/min |
| Aluminum-grade | Non-ferrous composites | Plastic, phenolic, FRP | 100-250 m/min |
Recommended Cutting Parameters
Starting parameters for arc chamfer cutters. Adjust Vc down 20% for stainless steel or interrupted cuts. Use coolant (flood or MQL) for any cut deeper than the corner radius.
| Workpiece Material | Vc (m/min) | fz per tooth (mm) | ap (pass depth) | Coolant |
|---|---|---|---|---|
| Carbon Steel (1018 / 1045) | 80 - 120 | 0.03 - 0.06 | 0.3 - 0.5 mm | Flood or MQL |
| Alloy Steel (4140 / 42CrMo) | 60 - 90 | 0.025 - 0.05 | 0.3 - 0.4 mm | Flood |
| Stainless Steel (304 / 316) | 40 - 70 | 0.02 - 0.04 | 0.2 - 0.3 mm | Flood (mandatory) |
| Cast Iron (GG25 / GGG40) | 70 - 110 | 0.04 - 0.08 | 0.4 - 0.6 mm | Dry or MQL |
| 6061-T6 Aluminum | 180 - 300 | 0.05 - 0.10 | 0.5 - 1.0 mm | MQL or flood |
| 7075-T6 Aluminum | 150 - 240 | 0.04 - 0.08 | 0.4 - 0.8 mm | MQL or flood |
| Copper (C110) | 100 - 180 | 0.03 - 0.06 | 0.3 - 0.5 mm | Flood (mandatory) |
| Brass (C360) | 150 - 250 | 0.05 - 0.10 | 0.5 - 1.0 mm | MQL or dry |
For drilling companion cutters in steel or aluminum, browse carbide drill bits, HRC60 5D carbide drills, or 12D extra-long carbide drill bits.
For Individual Buyers & Small Workshops
Single-piece orders welcome — no MOQ, no bulk-buy requirement. We ship to home addresses, garage workshops, and small machine shops in 50+ countries. Every order ships from our Hangzhou warehouse with DHL / UPS / FedEx tracking provided.
Volume Discount
2-9 pieces: 6% OFF · 10+ pieces: 12% OFF · Mix-and-match across all radii + grades in one cart.
3-7 Day Global Shipping
DHL / UPS / FedEx express to 50+ countries · Tracked door-to-door · Most orders ship within 24 hours from order.
WhatsApp Quote in 2 min
Send your radius R + grade (steel or aluminum) + workpiece material · Real human reply within 2 hours (UTC+8 working hours) · No chatbot, no call-center queue.
Built for Small-Shop Buyers
Hobby machinists · Garage CNC users · Mould makers · Jewellery & watch makers · Trade-school students.
Arc Chamfer vs Square End Mill vs Ball End Mill
Each cutter is engineered for a different geometry. Choosing the wrong one wastes passes or produces the wrong profile. Here's when to reach for which:
| Operation | Reach For | Why |
|---|---|---|
| Rounded corner with defined radius R | Arc chamfer cutter (this collection) | Convex tip produces the exact radius in one pass. |
| Sharp 90° corner on outside edge | Square end mill | Flat bottom leaves a square corner — no rounded profile. |
| Concave 3D surface (mould cavity) | Ball end mill | Spherical tip matches concave geometry in tool paths. |
| Convex 3D surface (mould core) | Ball end mill | Spherical tip generates convex 3D geometry. |
| Sharp chamfer (flat-bottomed 45° / 60°) | Chamfer mill | Angled flat tip produces consistent chamfer width. |
| Heavy stock removal in fillet | Square end mill + arc finish pass | Faster MRR for rough opening before finish. |
Browse corn-milling cutters for profile work, face-milling cutter series for surface facing, or chamfering cutter series for flat-bottom chamfers.
Related BEYOND Cutters
Steel-Grade T-Slot Cutters
TiAlN-coated, for steel / stainless / cast iron T-slot profiling.
Aluminum-Grade T-Slot Cutters
Mirror-polished, 55° helix, for aluminum / copper / brass.
Chamfering Cutter Series
Flat-bottom chamfers at 45° / 60° angles.
Best Sellers
Top-rated cutters across the BEYOND range.
All BEYOND Products
Browse the full BEYOND brand catalogue.
Corn-Milling Cutters
Profile sidewall milling for fillet work.
Face-Milling Cutters
Surface facing before arc chamfer work.
12D Extra-Long Drills
Deep-hole drilling companion to chamfer work.
Carbide Drill Bits
All carbide drill bits for fixture prep.
HRC60 5D Carbide Drill
Hardened-steel drilling for mould work.
HRC65 8D Carbide Drill
Internal coolant for hardened-steel deep holes.
A/B Type Center Drills
DIN 333 center drilling before arc chamfer work.
3D Carbide Drill Bits
3×D standard-length carbide drill for chamfer prep.
Holder Accessories
Wrenches, screws, and clamping elements.
CNC Knowledge Base
Buyer guides, grade comparisons, cutting charts.
Frequently Asked Questions
What does the "R" in R1, R2, etc. actually mean?
R = corner radius in mm. An R4 cutter produces a 4 mm radius on the workpiece corner. The body diameter D is always 2 × R (e.g. R4 has D = 8mm). Pick the R value that matches your design drawing's fillet specification. Standard radii in this collection: R1, R1.5, R2, R2.5, R3, R4, R5, R6, R8.
Can I use a steel-grade cutter on aluminum, or aluminum-grade on steel?
Steel-grade on aluminum: works poorly. TiAlN coating chemically reacts with aluminum at high Vc, causing built-up edge (BUE) within seconds. The mirror-polished aluminum-grade cutter is the right choice for non-ferrous. Aluminum-grade on steel: works but wears fast. Uncoated polished carbide on steel at 80-120 m/min loses edge quickly because there's no coating to handle the heat. Pick the grade that matches your workpiece material.
Should I use coolant when chamfer cutting with these cutters?
For steel-grade SKUs: flood coolant is mandatory for stainless steel, recommended for carbon / alloy steel. For cast iron: dry or MQL works fine. For aluminum-grade SKUs: MQL is the sweet spot — prevents built-up edge without thermal shock. Flood works too but may cause issues on thin aluminum sections. Dry cutting on aluminum is possible for short passes on rigid setups but extended dry cuts will eventually build up edge.
📦 Shipping cost & delivery time for individual buyers?
We ship to 50+ countries via DHL / UPS / FedEx. Most orders deliver in 3-7 business days. Shipping cost is calculated at checkout based on destination — typically $15-$35 for a single arc chamfer cutter to North America / Europe / Asia-Pacific. Tracking link is emailed within 24 hours of dispatch. We also ship to home addresses (not just commercial).
🛒 Can I order just 1 piece to try?
Yes — 1 piece welcome. No MOQ, no bulk-buy requirement. Single-piece orders get the same DHL/UPS/FedEx tracked shipping as bulk orders. Volume discount is automatic in cart: 2-9 pieces 6% OFF, 10+ pieces 12% OFF — but you never have to hit those tiers to place an order.
⇆ Returns & warranty?
30-day return window for unused product in original packaging. If a cutter arrives damaged or defective, we ship a replacement free of charge (you keep the original). For production-line failures (edge chipping under normal use within the first 10 cuts), send a photo to chao@cnchome-beyond.com or WhatsApp +86 15990663752 and we’ll troubleshoot or replace.
Technical questions: chao@cnchome-beyond.com · WhatsApp: +86 15990663752 · Browse all BEYOND brand products: BEYOND collection