Rotary Metal Slitters for Precision Metal Processing
Metal Slitting Blades
Complete rotary coil slitting tooling for metal service centres and steel mills: D2, SKD-11, Cr12MoV, and H13 circular slitter knives lapped to Ra ≤ 0.2 with ±0.001mm thickness tolerance (OD ≤ 420mm) for zero-burr shearing of CR/HR steel, galvanized coil, silicon steel, and non-ferrous foils. Supplied as matched sets with precision steel spacers, rubber bonded stripper rings, and overarm separator discs—ensuring balanced arbor loading on slitting lines from 400 to 2000mm entry width.
- ■Material: D2, SKD11, Cr12MoV, LD, H13, HSS
- ■Applications: Cold/Hot Rolled Steel, Silicon Steel, Galvanized Sheet & Non-Ferrous Foils
■ ISO 9001:2015 Certified
■ In-House Heat Treatment
■ Strict Dimensional Tolerances
■ Global Door-to-Door Delivery
[ Engineering Reference ]
Decisive Specifications
| Material | D2, SKD11, Cr12MoV, LD, H13, HSS |
|---|---|
| Hardness | 58 - 64 HRC (Application Dependent) |
| Thickness Tolerance | Up to ±0.001 mm |
| O.D. Tolerance | Up to ±0.01 mm |
| Parallelism | Up to 0.002 mm |
| Surface Finish | Lapped / Polished (Ra ≤ 0.2) |
| Complete Tooling | Spacers, Rubber Rings, Separators |
| Applications | Cold/Hot Rolled Steel, Silicon Steel, Galvanized Sheet & Non-Ferrous Foils |
■ All values verified via CMM inspection · ISO 9001:2015
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[ Standard Reference ]
Common Standard Dimensions
| Outer Diameter (OD) | Inner Diameter (ID) | Thickness |
|---|---|---|
| OD ≤ 250 mm | Tolerance: +0.01 | Tol: ±0.001 mm |
| OD ≤ 420 mm | Tolerance: +0.01 | Tol: ±0.001 mm |
| OD ≤ 720 mm | Tolerance: +0.01 | Tol: ±0.005 mm |
| OD ≤ 1000 mm | Tolerance: +0.01 | Tol: ±0.030 mm |
| OD ≤ 1600 mm | Tolerance: +0.01 | Tol: ±0.050 mm |
[ Technical Audit ]
Engineering Advantages
Micro-Tolerance Engineering
Engineered with a thickness tolerance of up to ±0.001 mm and parallelism of 0.002 mm (for OD ≤ 420mm). Guarantees zero cumulative error when stacking multiple blades on the slitter arbor.
Complete Slitting Tooling
Beyond blades, we provide exact-match steel spacers, rubber bonded stripper rings, and separator discs. A fully integrated system ensures perfect tension and burr-free coil rewinding.
Premium Alloy Selection
From high-chromium D2/SKD11 for cold-rolled steel, to heat-resistant H13 for hot mills. Each blade is vacuum hardened to deliver exceptional wear resistance and edge strength for high-speed metal slitting.
[ System Inventory ]
Related Blade Categories
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[ Knowledge Base ]
Product FAQs & Buying Guidance
Technical FAQs
01What knife clearance should I set for cold-rolled steel versus silicon steel (CRGO)?+−
For cold-rolled mild steel (CR, HG, EG), set side clearance at 8–12% of material thickness. For silicon steel (CRGO/CRNO), tighten clearance to 5–8% — silicon steel's extreme hardness and brittleness demand a tighter shear gap to prevent the edge fracturing that produces burr on transformer laminate strips. Excessive clearance on CRGO is the leading cause of slit-width non-conformance in electrical steel processing.
02Why does my slit-width drift across the full coil width after the first coil?+−
Slit-width drift is caused by blade-to-spacer face contact loss from varying thickness tolerances in the arbor stack. Even a 0.002mm blade-thickness inconsistency in a 10-knife stack creates a cumulative 0.02mm lateral shift that widens into visible slit-width deviation at line speed. Our blades are lapped to ±0.001mm thickness tolerance and Ra ≤ 0.2μm face finish, eliminating the air gaps that allow individual blade deflection under lateral slitting load.
03Can Sureay supply a complete integrated tooling package including spacers and stripper rings?+−
Yes. We supply complete matched slitting tooling systems: knife set, precision steel spacers (±0.001mm), rubber bonded stripper rings, and overarm separator discs — all verified as a matched system on a CMM before dispatch. Sourcing all components from a single verified tolerance stack eliminates the cumulative errors that appear when mixing tooling from separate suppliers.
04What knife clearance and tooling tolerance do I need for slitting lithium battery electrode foils?+−
For EV battery electrode foils (8–12μm aluminium cathode, 6–10μm copper anode), side clearance must be held at 0.5–1.0% of material thickness — typically 0.05–0.10mm. This is below reliable manual feeler-gauge measurement; arbor tooling must use precision spacers held to ±0.001mm to achieve consistent clearance across a multi-knife arbor. We supply complete validated tooling packages for electrode foil applications with full CMM dimensional traceability.
05What maintenance inspection schedule do you recommend to maximize circular slitter knife service life?+−
Inspect knife faces weekly under 10× magnification for micro-pitting (corrosive environment) and edge chipping (clearance drift or hard inclusion). Re-lap side faces when Ra exceeds 0.4μm to restore full arbor contact. Disassemble and inspect spacers for scoring every 500,000m of production. Store removed knives in rust-inhibitor oil or nitrogen-purged bags to prevent corrosive pitting during idle periods.
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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