What Are Slitter Knives? Uses & Types
In coil processing, the efficiency of a slitting line depends heavily on the quality of slitter knives. As a professional slitter knives manufacturer and reliable rotary shear manufacturer, we understand that even a 0.002mm tolerance deviation can cause severe burrs on coil edges or uneven side clearance.
Slitter knives — also widely known as coil slitting tools, circular shearing blades, and steel slitting knives — are precision cutting tools for metal sheet slitting lines.
They cut wide metal coils into narrow, custom-width strips.
Key industries include metallurgy, metal processing, automotive, home appliances, and hardware.
Blade precision directly affects edge quality, burrs, and production efficiency.
Core Features of Slitter Knives
High Hardness & Long Service Life
Made from Cr12MoV, SKD11, HSS, or carbide.
Heat treated to HRC58–62.
Optional coating for improved wear resistance.
Fewer blade changes, lower production costs.
Micron-Level Precision & Burr-Free Cuts
Tight edge and runout tolerances.
Clean, flat edges with no curling or burrs.
No secondary processing required.
Fully Customizable Sizes
Custom OD, ID, thickness, and edge angle.
Fit all types of slitting machines.
Available in round or special shapes.
Upper and lower blade sets provided.
High-Speed Stability
Minimal deformation after heat treatment.
No wobbling during high-speed slitting.
Consistent strip width.
Less scrap, higher material utilization.
Main Types of Slitter Knives
Circular Slitter Knives
The most common type, with a disc shape.
Multiple blades can be set to different widths.
Suitable for steel, aluminum, and standard stainless steel coils.
Special-Shaped Slitter Knives
Custom stepped or beveled edges.
For thick, hard, or special alloy coils.
Designed for special slitting machines and high-precision tasks.
Upper & Lower Blade Sets
Work in pairs for balanced cutting force.
Standard configuration for most slitting machines.
Ideal for all metal coil slitting applications.
Applications of Slitter Knives
Metallurgy Industry
Large-scale slitting of steel, aluminum, and stainless coils in mills.
Metal Processing Industry
Custom narrow-width slitting for downstream size requirements.
Automotive & Home Appliance Industry
Precision strips for car parts, appliance shells, and hardware components.
Special Materials Processing
Slitting of galvanized, color-coated, copper, and titanium strips with surface protection.
Key Production Technology
Material Selection
Alloy tool steel, HSS, or carbide for reliable performance.
Heat Treatment
Vacuum quenching for uniform hardness and toughness, preventing chipping and breakage.
CNC Machining
Precision lathing and grinding for tight assembly and cutting tolerances.
Custom Edge Design
Small angles for thin materials, large angles for thick/hard materials.
Polished edges for smooth cutting.
Surface Treatment
Nitriding or coating to increase hardness, reduce friction, and prevent material adhesion.
Operation & Maintenance Tips
Installation
Check for edge chipping before installation.
Ensure proper alignment with the spindle.
Tighten securely to avoid wobbling.
Machine Settings
Adjust the gap according to material type and thickness.
Too large a gap causes burrs; too small accelerates wear.
Use & Storage
Clean chips regularly to protect the cutting edge.
Store idle blades in dry, flat conditions with anti-rust treatment.
Avoid collision and damage.
Why Choose Our Slitter Knives?
Direct Manufacturer
In-house production with complete CNC equipment.
Custom orders supported, on-time delivery guaranteed.
Quality Assurance
Full-process inspection from raw material to finished product.
Stable precision and wear resistance.
Full Product Range
Round, special-shaped, and upper/lower blades.
Compatible with all slitting machine models.
Complete After-Sales Support
Professional blade selection advice.
Installation guidance and regrinding/repair services.
Material Recommendations by Application
Carbon Steel Strip
Cr12MoV / SKD11, HRC58–60.
Tough and wear-resistant for mass production.
Stainless Steel (304, 316, 430)
Cr12MoV1 / D2, HRC60–62.
High wear resistance, no chipping, clean burr-free cuts.
Aluminum, Copper & Soft Metals
HSS or alloy tool steel.
Smooth cuts, less sticking and scratching.
Galvanized & Color-Coated Strip
Cr12MoV, polished or nitrided, HRC58–60.
Protects coatings and avoids zinc loss or surface scratches.
Blade Metal Materials International Grade Corresponding Table
China (GB) | USA(ASTM) | Japan (JIS) | Germany (DIN) | Germany (W-Nr) | France (NF) | Russia (ROCT) | U.K (BS) |
Cr12MOV | - | SKD11 | X165CrMov12 | 1.2601 | - | X12M | - |
Cr12Mo1V1 | D2 | - | X155Cr12Mo12 | 1.2379 | X160CrMoV12 | - | BD |
4Cr5MoSiVI | H13 | SKD61 | X40CrMoV5-1 | 1.2344 | X40CrMoV5 | 4X5MO1C | BH13 |
LD | - | - | - | - | - | - | - |
W18Cr4V | T1 | SKH2 | S18-0-1 | 1.3355 | HS18-0-1 | P18 | BT1 |
W6Mo5Cr4V2 | M2 | SKH9 | S6-5-2 | 1.3343 | - | P6M5 | BM2 |
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