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Description
MATERIALHSS
STANDARDDIN 6518
RADIUSR3 mm
CUTTING EDGESZ = 4
HSS corner rounding cutter R3 mm — technical specifications
Concave form cutter NFRk DIN 6518 — dimensions, material and tool specifications
Concave corner rounding cutter R3 mm type NFRk from Varel — a professional form cutter made of high-speed steel (HSS) HSS (64 HRC) in accordance with the standard DIN 6518. The cutting diameter Ø12 mm and 4 cutting edges ensure efficient material removal while maintaining profile accuracy. The Weldon shank Ø12 mm ensures stable clamping even at higher cutting parameters.
RADIUS R 3 mm
CUTTER DIAMETER Ø12 mm
LENGTH L 60 mm
SHANK D Ø12 mm
| TECHNICAL DATA | |
|---|---|
| Cutter type | Concave quarter-round 3 mm DIN 6518 |
| Radius R | 3 mm |
| Cutter diameter | Ø12 mm |
| Diameter D1 | 6 mm |
| Overall length L | 60 mm |
| Shank length I | 41.2 mm |
| Shank diameter d | Ø12 mm |
| Number of cutting edges Z | 4 |
| Material | HSS (high-speed steel) |
| Standard | DIN 6518 |
| Shank type | Weldon straight shank |
Applications of the R3 mm corner rounding cutter
Workpiece materials and compatibility by ISO material group
The R3 mm HSS concave quarter-round radius cutter is one of the most commonly used form cutter sizes in the machinery industry. The radius R3 mm matches the standard rounded edges specified in the design documentation for machine parts, housings and tooling components. The tool is also used to machine casting molds and dies where repeatable quarter-round profiles are required.
Cutting data for the HSS corner rounding cutter R3
| Mat. group | Material | Vc [m/min] | fz [mm/tooth] | n [rpm] | F [mm/min] |
|---|---|---|---|---|---|
| P 1.1 | Structural steel ≤500 N/mm² | 28 | 0.048 | 743 | 143 |
| P 1.5 | Alloy steel 850–1000 N/mm² | 16 | 0.040 | 424 | 68 |
| M 2.1 | Austenitic stainless steel | 18 | 0.048 | 477 | 92 |
| M 2.3 | Martensitic stainless steel | 12 | 0.040 | 318 | 51 |
| K 3.1 | Gray cast iron | 22 | 0.064 | 584 | 150 |
| K 3.3 | Ductile cast iron | 28 | 0.048 | 743 | 143 |
| N 6.2 | Brass, bronze | 28 | 0.048 | 743 | 143 |
| N 7.1 | Aluminum — Al-Si alloys | 80 | 0.032 | 2122 | 272 |
| N 7.2 | Pure aluminum | 200 | 0.048 | 5305 | 1019 |
| S 8.1 | Thermoplastics | 96 | 0.040 | 2546 | 407 |
Machining tip
For profile milling with a corner rounding cutter, use down milling (climb milling) for a better surface finish. For soft materials (Al, Cu), use higher cutting speeds and lower feed per tooth to avoid built-up edge (BUE).
Advantages of the HSS DIN 6518 form cutter
Process of manufacturing an HSS cutter
1 HSS material
hardness 64 HRC
2 CNC grinding
profile R3 mm
3 Weldon shank
clamping Ø12
✓ Quality control
standard DIN 6518
Frequently asked questions
The R3 mm HSS cutter to DIN 6518 is suitable for machining a wide range of materials: structural and alloy steels (ISO groups 1.1–1.8), stainless steels (2.1–2.3), gray and ductile cast iron (3.1–3.5), copper, brass and bronze (6.1–6.4), aluminum (7.1–7.4) and plastics (8.1–8.3). Cemented carbide cutters should be used for steels hardened above 45 HRC.
The NFRk concave radius cutter forms a convex quarter-round edge with a radius of R3 mm on the workpiece. The NFRx convex radius cutter with the same radius instead cuts a concave profiled groove. Both types are covered by DIN 6518 and are available in the same size ranges.
For a cutter with a Ø12 mm Weldon shank, the optimal solution is a collet chuck ER32 (clamping range 2–20 mm) with an ER collet matching the shank diameter. ER collet chucks provide concentric clamping with radial runout below 0.01 mm, resulting in a better surface finish during profile milling. The ER collet distributes clamping force evenly around the entire shank circumference, eliminating the risk of tool deformation.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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