Industrial Rotary Slitter Knives & Circular Slitting Blades
Rotary Slitter Knives
Precision-ground circular slitter and score-cut knives for demanding high-speed converting lines. Matched top/bottom shear pairs, crush-cut anvil blades, and razor-trim profiles manufactured from 52100, D2, M2 HSS, or ASP23 PM steel to ±0.002mm thickness tolerance and ≤0.02mm T.I.R. runout. Proven in BOPP film, lithium battery foil, non-woven, and pressure-sensitive label converting—with optional TiN or DLC anti-stick coatings for adhesive substrates.
- ■Material: 52100, D2, M2 (HSS), ASP23/ASP52 (PM), Solid Carbide
- ■Application: Paper & Corrugated Packaging, Flexible Plastics & Films, Metal Foils (Battery & Packaging), Non-Wovens & Textiles, Tapes & Labels
■ ISO 9001:2015 Certified
■ In-House Heat Treatment
■ Strict Dimensional Tolerances
■ Global Door-to-Door Delivery
[ Engineering Reference ]
Decisive Specifications
| Material | 52100, D2, M2 (HSS), ASP23/ASP52 (PM), Solid Carbide |
|---|---|
| Cutting Styles | Shear Slitting, Score/Crush Cutting, Razor Slitting |
| Surface Finish | Precision ground to Ra 0.2 - 0.4 |
| Tolerance | Thickness: ±0.002mm | Runout: ≤0.02mm |
| Coatings | TiN, DLC, Teflon, CrAl (Optional for friction reduction) |
| Application | Paper & Corrugated Packaging, Flexible Plastics & Films, Metal Foils (Battery & Packaging), Non-Wovens & Textiles, Tapes & Labels |
■ All values verified via CMM inspection · ISO 9001:2015
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Don't see your exact specs? Send us a blueprint, a worn sample, or just your machine model. Our team will review the details and provide a tailored quotation.
[ Standard Reference ]
Common Standard Dimensions
| Blade Type | Outer Diameter | Inner Diameter | Thickness |
|---|---|---|---|
| Top Blade (Dished) | 75 mm | 45 mm | 1.0 / 1.2 mm |
| Bottom Blade (Anvil) | 70 mm | 45 mm | 10 / 8 mm |
| Top Blade (Dished) | 100 mm | 35 mm | 1.2 mm |
| Bottom Blade (Anvil) | 80 mm | 60 mm | 20 / 16 mm |
| Top Blade (Dished) | 118 mm | 80 mm | 1.2 mm |
| Bottom Blade (Anvil) | 100 mm | 70 mm | 20 / 16 mm |
| Top Blade (Dished) | 150 mm | 80 mm | 2.5 mm |
| Bottom Blade (Anvil) | 108 mm | 80 mm | 20 / 18 mm |
[ Technical Audit ]
Engineering Advantages
Application-Specific Tool Steels
We don't believe in 'one-size-fits-all'. We match the blade material to your web. Choose high-carbon steels for standard paper, M2 High-Speed Steel for tough plastics, or Solid Carbide for highly abrasive metal foils and fiberglass.
Advanced Surface Treatments
For converting sticky tapes, adhesives, or high-friction films, our optional TiN, DLC, and Teflon coatings dramatically reduce web drag, prevent material build-up on the blade bevel, and extend the MTBR (Mean Time Between Replacements).
Optimized Edge Geometries
Available in various edge profiles (single bevel, double bevel, blunt edge) engineered specifically for shear slitting (top/bottom knives), crush/score cutting against hardened anvils, or high-speed rewinder trimming.
[ System Inventory ]
Related Blade Categories
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[ Knowledge Base ]
Product FAQs & Buying Guidance
Technical FAQs
01What thickness tolerance should I specify for blades on a multi-knife arbor stack?+−
For shear slitting of flexible films and foils, specify ±0.002mm thickness tolerance and ≤0.02mm T.I.R. runout. A 0.005mm error per blade compounds across a 12-knife stack, producing visible slit-width deviation and web tension spikes. We grind every blade to these tolerances and verify on a CMM before dispatch.
02How do I prevent adhesive film transfer and build-up on slitter blade faces?+−
Adhesive build-up on blade faces increases friction, raises web temperature, and causes material transfer contamination. We offer TiN (titanium nitride) and DLC (diamond-like carbon) PVD coatings that reduce surface adhesion by up to 80%, extending clean-running intervals on pressure-sensitive tape and adhesive laminate slitting applications.
03When should I upgrade from D2 to powder-metallurgy (PM) steel for my slitter?+−
PM steel (ASP23, ASP52) is recommended when slitting battery-grade aluminium or copper electrode foils for EV cells, fiberglass-reinforced packaging, or silica-coated release liners. These substrates exceed the abrasion ceiling of D2 within a single production run. PM grades deliver uniform carbide distribution and 50–80% longer edge life on highly abrasive substrates.
04What surface coating is best for slitting pressure-sensitive adhesive tapes at high speed?+−
DLC (diamond-like carbon) PVD coating is the top specification for double-coated foam tape and transfer adhesive slitting. It reduces contact angle on the blade face by approximately 35° versus uncoated D2, maintaining consistent slip through 8–12 hour production runs without cleaning stops. TiN is effective for single-faced masking tape and lightly adhesive label stock at a lower coating cost.
05Can Sureay supply matched top and bottom knife pairs verified to a specified shear clearance?+−
Yes. Matched shear pairs — dished top blade and grooved anvil bottom blade — are supplied with knife-to-knife clearance pre-verified against your substrate specification. We record OD, ID, thickness, and designed shear clearance for each matched pair on an engineering data sheet that ships with the tooling, allowing line operators to replicate the clearance setting on every reinstallation.
Why Choose Sureay
01Are you a trading company or a direct manufacturer?+−
We are a 100% direct OEM manufacturer established in 2008. When you buy from Sureay, you bypass middleman markups and communicate directly with the engineers who forge and grind your blades.
02What makes Sureay's heat treatment different from cheaper alternatives?+−
Unlike standard quenching, every Sureay blade undergoes deep cryogenic treatment after vacuum hardening. This transforms retained austenite into martensite, boosting wear resistance by up to 40% and ensuring uniform hardness across the entire cutting edge.
03Do you ship globally and how long does it take?+−
Yes, we export to over 50 countries. Standard OEM replacement blades typically ship within 48 hours. Custom profiles take 10–15 working days. We partner directly with DHL, FedEx, and international sea freight forwarders for reliable door-to-door delivery.
04What quality certifications does Sureay hold, and can you provide material test reports?+−
Sureay is ISO 9001:2015 certified. Every shipment includes a Rockwell HRC hardness test report, a dimensional inspection record, and a heat treatment batch certificate. For OEM qualification, full CMM dimensional reports and steel mill certificates are available on request.
05Can we trial a sample set before committing to a full production order?+−
Yes. We offer sample sets (typically 2–5 blades) for machine fit verification and edge life testing. Standard sample lead time is 5–7 working days. For custom profiles, dimensional sign-off samples are produced before full production commences — no tooling commitment until fit is confirmed.
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