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Circular Slitter Blades & Round Knives

Circular slitter blades and round knives engineered for slitting performance—matched to your material behavior, line speed, and edge-quality targets for stable running, clean cuts, and predictable blade life.

Precision round blades for industry

Round Blades We Manufacture

YISHI Machinery manufactures industrial round blades and circular slitter knives for continuous converting, slitting, and trimming operations across film, foil, paper, textile, and nonwoven production lines. For food manufacturing applications, see our bread slicer blades, produced in food-grade 420J2 and 440C stainless steel to OEM dimensional tolerances. Each rotary knife is produced from vacuum heat-treated tool steels—including D2/SKD11 (HRC 58–62), M2 high-speed steel, and sub-micron tungsten carbide—to deliver controlled edge retention and reduced burr formation on materials from 10-micron PET to heavy-gauge abrasives. Blades are supplied with user-specified OD, ID, thickness, and edge geometry, ground to a typical flatness of 0.005 mm and bore concentricity of 0.003 mm, making them a direct fit for OEM slitter assemblies and pneumatic knife holders from Dienes, Tidland, and similar systems.

Take a Closer Look

  • Flexible Packaging Film Slitting
  • Pressure-Sensitive Tape Converting
  • Nonwoven and Textile Cutting
  • Battery Electrode and Separator Slitting
  • Paper and Labelstock Converting
  • Aluminum Foil and Metal Laminates
  • Flexible Packaging Film Slitting

    Circular shear slitter blades for BOPP, PET, CPP, and PE films at line speeds up to 800 m/min. D2 blades with a 30° single bevel are typical for clean edge initiation.

  • Pressure-Sensitive Tape Converting

    Tungsten carbide or M2 HSS round blades for log slitting of adhesive tapes, where adhesive build-up resistance and long regrind intervals are required.

  • Nonwoven and Textile Cutting

    Scalloped or toothed rotary knives for cutting spunbond, meltblown, and needle-punched fabrics, reducing fiber pull-out compared to plain-edge blades.

  • Battery Electrode and Separator Slitting

    Ultra-fine-grain carbide blades with a polished edge finish for slitting lithium-ion battery electrodes and ceramic-coated separators without generating micro-burrs that risk internal short circuits.

  • Paper and Labelstock Converting

    D2 or HSS circular blades for sheeting and slitting of thermal paper, release liners, and label face stocks, with edge retention optimized for silica-coated substrates.

  • Aluminum Foil and Metal Laminates

    M2 high-speed steel or carbide blades with a robust edge angle for slitting aluminum foil down to 6 microns and laminated foil structures without edge folding.

Technical Specifications

Dimensions Outer diameter: 50 mm to 600 mm; Inner diameter: 15 mm to 300 mm; Thickness: 0.3 mm to 15 mm. Larger dimensions available on request.
Materials D2 (Cr12MoV/SKD11), M2 high-speed steel, H13 hot-work steel, tungsten carbide (K10/K20/K30 equivalent), 9CrSi, HSS-E (M35)
Hardness D2: HRC 58–62; M2: HRC 62–65; Tungsten Carbide: HRA 89–92.5
Tolerances OD: ±0.01 mm; ID: H6/H7; Thickness: ±0.005 mm; Flatness: ≤0.005 mm; Concentricity: ≤0.003 mm
Surface Finish Blade faces: Ra 0.2–0.4 µm; Bore: Ra 0.8 µm; Cutting edge: polished to Ra 0.1 µm for non-stick applications
Customisation Buyers can specify OD, ID, thickness, edge angle, bevel type, bore tolerance, keyway dimensions, pin holes, and material grade. Submit a drawing or OEM part number for a matched quote.

Why Choose Yishi

YISHI Machinery operates in-house vacuum heat treatment and double-disc grinding cells, giving us direct control over the hardness profile and flatness of every circular knife and round blade batch we produce. We match OEM bore configurations—including Dienes, Tidland, and Burris—without adapter rings, reducing assembly runout. Our application engineers review failure modes on existing blades and recommend material or geometry changes that have extended regrind intervals by 30–50% in documented converting lines. Every shipment includes a dimensional inspection report with measured OD, ID, thickness, flatness, and hardness values traceable to the lot number. We support single-prototype orders with a 2D drawing approval step before production release.

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Frequently Asked Questions

  • What is the typical hardness range for D2 round blades?

    Our D2 (SKD11/Cr12MoV) round blades are vacuum heat-treated and double-tempered to HRC 58–62. This range provides a balance between edge retention and toughness, reducing the risk of micro-chipping on thin films. For applications requiring higher hardness, we recommend M2 high-speed steel at HRC 62–65.

  • Can you match the bore and keyway of my existing slitter blade?

    Yes. Provide the OEM part number or a dimensioned drawing of the bore, keyway, pin holes, and any counterbores. We machine bores to H6 or H7 tolerance and can replicate single or double keyways, threaded mounting holes, and stepped bores to fit directly onto your existing arbor without adapter rings.

  • What edge geometries are available for film slitting?

    We supply single bevel, double bevel, compound bevel, and radiused edges. For thin films under 30 microns, a single bevel at 20–30° with a honed edge apex of 0.01–0.02 mm radius is typical to initiate a clean cut without tearing. Our application team can recommend a geometry based on your material and line speed.

  • How do you control runout on circular slitter blades?

    We control runout through two steps: double-disc grinding of the blade body to achieve flatness and parallelism within 0.002 mm, followed by OD finishing on an arbor-mounted setup that replicates the customer's mounting condition. This process keeps radial runout within 0.005 mm, which is critical for maintaining consistent blade-to-blade gap in multi-knife slitting stations.

  • What is the advantage of tungsten carbide over tool steel for round blades?

    Tungsten carbide with sub-micron grain size and 6–10% cobalt binder achieves hardness of HRA 89–92.5, significantly higher than tool steel. This translates to 3–5x longer edge life when slitting abrasive materials such as glass-fiber prepreg, sandpaper, or filled polymers. The trade-off is lower fracture toughness, so carbide is not recommended for interrupted cuts or impact applications.

  • Do you provide dimensional inspection reports with each order?

    Yes. Every batch of round blades ships with a lot-traceable inspection report that includes measured values for OD, ID, thickness, flatness, and hardness. Additional measurements such as bore concentricity or edge radius can be included upon request at the time of order.

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