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Description
MATERIALHSS
STANDARDDIN 6518
RADIUSR4 mm
CUTTING EDGESZ = 4
HSS corner rounding cutter R4 mm — technical specifications
Concave form cutter NFRk DIN 6518 — dimensions, material and tool specifications
Concave corner rounding cutter R4 mm type NFRk from Varel — a form cutter made of high-speed steel (HSS) HSS (hardness 64 HRC) for milling quarter-round edges in accordance with the standard DIN 6518. The cutting diameter Ø14 mm allows efficient machining of larger radii. The Weldon straight shank Ø12 mm provides adequate clamping rigidity under increased cutting forces.
RADIUS R 4 mm
CUTTER DIAMETER Ø14 mm
LENGTH L 60 mm
SHANK D Ø12 mm
| TECHNICAL DATA | |
|---|---|
| Cutter type | Concave quarter-round 4 mm DIN 6518 |
| Radius R | 4 mm |
| Cutter diameter | Ø14 mm |
| Diameter D1 | 6 mm |
| Overall length L | 60 mm |
| Shank length I | 40 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 R4 mm corner rounding cutter
Workpiece materials and compatibility by ISO material group
The R4 mm HSS concave quarter-round radius cutter is designed to machine rounded edges with a radius of R4 mm on larger workpieces. Used in series production of heavy machinery components, steel structures, frames and housings where design standards require rounded edges with a specified radius. The larger cutting diameter of Ø14 mm provides more stable tool operation and a better surface finish compared with smaller sizes.
Cutting data for the HSS corner rounding cutter R4
| Mat. group | Material | Vc [m/min] | fz [mm/tooth] | n [rpm] | F [mm/min] |
|---|---|---|---|---|---|
| P 1.1 | Structural steel ≤500 N/mm² | 28 | 0.052 | 637 | 132 |
| P 1.5 | Alloy steel 850–1000 N/mm² | 16 | 0.046 | 364 | 67 |
| M 2.1 | Austenitic stainless steel | 18 | 0.050 | 409 | 82 |
| M 2.3 | Martensitic stainless steel | 12 | 0.042 | 273 | 46 |
| K 3.1 | Gray cast iron | 22 | 0.068 | 500 | 136 |
| K 3.3 | Ductile cast iron | 28 | 0.056 | 637 | 143 |
| N 6.2 | Brass, bronze | 28 | 0.052 | 637 | 132 |
| N 7.1 | Aluminum — Al-Si alloys | 80 | 0.036 | 1819 | 262 |
| N 7.2 | Pure aluminum | 200 | 0.052 | 4547 | 946 |
| S 8.1 | Thermoplastics | 96 | 0.042 | 2183 | 367 |
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 R4 mm
3 Weldon shank
clamping Ø12
✓ Quality control
standard DIN 6518
Frequently asked questions
The R4 mm HSS quarter-round cutter is suitable for machining structural and unalloyed steels (groups 1.1–1.8), stainless steels (2.1–2.3), cast iron (3.1–3.5), copper, brass and bronze (6.1–6.4), aluminum and Al alloys (7.1–7.4) and thermoplastics (8.1–8.3). The HSS cutter is not intended for materials hardened above 45 HRC.
The concave radius cutter (NFRk) with a radius of R4 mm forms a convex rounded profile on the edge of the workpiece. The convex radius cutter (NFRx) with the same radius cuts a concave groove in the material. DIN 6518 specifies the dimensions of both types.
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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