📍 Anhui Province, China 📞 +86 155 5177 6915
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Factory Direct

Circular & Slitting Knives Manufacturer

Precision-ground circular slitting knives and rotary shear blades for film, foil, paper, tape and battery electrode converting lines. Made in our own workshop to your drawing or your sample.

Circular & Slitting Knives — slitter knives, factory direct

Key features

  • Diameters from 30 mm to 610 mm, thickness 0.3–15 mm
  • Concentricity held within 0.01 mm — no web wander at line speed
  • Top / bottom knife pairs ground as matched sets
  • TiN, TiAlN and DLC coatings for abrasive film and foil
  • Cryogenic treatment: +20–30% edge life vs standard quench

Specifications

MaterialCr12MoV, SKD-11 (D2), 9CrSi, HSS M2 / M42, solid tungsten carbide
HardnessHRC 58–62 (tool steel); HRC 64–66 (carbide)
Outer diameterφ30 – φ610 mm
Inner boreφ10 – φ300 mm, H7 tolerance
Thickness0.3 – 15 mm
Thickness tolerance±0.002 mm (precision grade)
Concentricity≤ 0.01 mm
Flatness≤ 0.005 mm
Edge angle20° – 60° single or double bevel
Surface roughnessRa 0.2 – 0.4 μm (mirror polished on request)
Heat treatmentVacuum quench + triple temper, optional cryogenic −196 °C
MOQ1 pc (sample) / 10 pcs (batch)

Applications

BOPP / PE / PET film slitting

Thin film converting and flexible packaging lines.

Aluminium & copper foil

Battery electrode and packaging foil slitting.

Paper & tissue rewinding

Slitter-rewinder top and bottom knives.

Tape & adhesive film

Clean burr-free edges on pressure-sensitive webs.

Blade types we make in this line

A partial list — if you do not see your blade, send us the drawing or a photo and we will confirm.

Top & bottom slitter knivesDished circular knivesBearing-mounted circular knivesSolid carbide circular knivesMulti-blade knife circlesTube-cutting circular knivesHalf-segment circular knivesCorrection-tape knivesPerforating circular knives

Fitting your machine, and buying a replacement

Our circular slitter knives are supplied as replacement blades for coil slitting and rewinding lines, including Dienes and Tidland slitting tooling, Kampf, Atlas and Goebel rewinders, and general-purpose film, foil, tape and paper slitting machines. Send the drawing, the machine brand and model, or a worn blade and we will match the outside diameter, bore, thickness and edge angle.

Also called: circular slitter blades · rotary slitter knives · top and bottom slitter blades · circular knife blade · slitting saw blade.

Materials used for this blade

Cr12MoV
HRC 58–62 · High

Widely used, well understood grade. Good balance of cost and life.

Read the full grade guide
SKD-11 (D2)
HRC 60–64 · Very high

Longer life than Cr12MoV at higher cost. The default upgrade.

Read the full grade guide
9CrSi
HRC 56–60 · Medium-high

Economical and forgiving. Common for large straight knives.

Read the full grade guide
HSS M2 / M42
HRC 62–66 · Very high

M42 (cobalt) for heat resistance at very high line speeds.

Read the full grade guide

Frequently asked questions

Tool steel (Cr12MoV / SKD-11) is the right choice for film, paper and foil at normal line speeds — it is resharpeneable and cost-effective. Choose solid tungsten carbide when you slit abrasive or filled film, or when changeover downtime is expensive: carbide lasts 10–20× longer but cannot be resharpened as many times.
Yes. Send the old knife with its dimensions (OD / ID / thickness / edge angle), or a clear photo with a ruler next to it. We confirm the drawing with you before production.
Standard production holds concentricity within 0.01 mm and thickness within ±0.01 mm. For battery electrode, optical film and other high-precision work we can reach ±0.002 mm thickness tolerance and Ra 0.2 μm surface finish. State your tolerance on the drawing and we will confirm feasibility before quoting.
MOQ is 1 piece for samples and 10 pieces for production runs. Lead time depends on quantity, material and coating — we confirm it together with the price when we quote, so you get one number that matches the actual order rather than a figure that slips later.
Yes. Send the machine brand and model, or the dimensions of the blade you are running — outside diameter, bore, thickness and edge angle. We make replacement blades to those figures and you can test one set before ordering production quantities.
They are a matched pair. The top knife is the smaller, thinner one and the bottom knife is the larger one that supports the cut. They must be ordered together and ground as a set, otherwise the clearance changes and edge life drops.

Not sure which blade fits?

Send a photo of the blade you use now with a ruler next to it. We will tell you the grade and the edge angle.

Ask us