Longitudinal Shear Circular Blade

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  • HRC 55–65Alloy tool steel, HSS
    & carbide grades
  • ±0.003 mmThickness tolerance,
    parallelism ≤0.002 mm
  • 90° Shear EdgeScissor cutting —
    burr-free, no roll-over
  • OD 80–450 mmBore, keyway & spline
    cut to your shaft

Designed for heavy-duty industrial slitting operations, the Dekeer Longitudinal Shear Circular Blade is a professional cutting tool engineered to deliver exceptional performance in metal sheet processing. Whether you’re slitting copper foil, aluminum foil, or silicon steel sheets, this circular slitter blade combines premium materials, ultra-fine precision, and durable construction to meet the demands of rolling slitting lines, rewinding machines, and other industrial cutting equipment. Backed by Dekeer’s decades of knife-making expertise, it’s the reliable choice for metal processing, building materials, and packaging industries worldwide.

  • Scissor-action shear cutting, not crushing — a matched set of rotary knives on the slitter arbor gives a clean sheared edge with no burr and no roll-over
  • Alloy tool steel, high speed steel or tungsten carbide — the grade is matched to your gauge, tensile strength and line speed, from 0.2 mm foil to 6 mm strip
  • Thickness held to ±0.003 mm with parallelism ≤0.002 mm — uniform horizontal knife clearance across the whole shaft, so strip width stays consistent end to end
  • Bore, keyway, spline and pin holes cut to your shaft drawing — every blade arrives ready to mount, with the runout already checked on a mandrel
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Longitudinal Shear Circular Blades We Manufacture

  • Circular slitter knife assemblies, blade and hub sets
    Circular slitter knife assemblies — blade and hub sets built for arbor mounting
  • Longitudinal shear circular blades in several diameters
    Longitudinal shear blades in a range of diameters and bore sizes
  • Precision ground circular slitting knife with large bore
    Precision-ground circular slitting knife with a large bore
  • Rotary shear blade with keyway bore for keyed slitter shaft
    Rotary shear blade with keyway bore for a keyed slitter shaft
  • Slitter knife with keyway, faces ground parallel
    Slitter knife with keyway — both faces ground parallel
  • Circular knife with pin-hole bore for bolt mounting
    Circular knife with pin-hole bore for bolt-mounted heads

Choosing the Grade: Alloy Tool Steel, HSS or Tungsten Carbide

GradeHardnessBest forWhat it gives you
Cr12MoV / D2 (SKD11)HRC 57–610.2–3.0 mm cold-rolled, galvanised and zinc-coated stripThe workhorse grade for general coil slitting — high chromium-carbide content, good abrasive wear resistance and a sensible cost per cut.
Cr12Mo1V1HRC 58–61Mixed thin-to-medium gauge runs, frequent size changesThe higher-vanadium version of Cr12MoV: finer, better distributed carbides for steadier edge retention when the material keeps changing.
6CrW2SiHRC 55–583.0–6.0 mm medium and heavy gauge steelShock-resisting tool steel. The slightly softer matrix absorbs the shear back-pressure of thick strip instead of chipping at the edge.
DC53HRC 60–63High-impact slitting and thin gauge run at speedHigher toughness than D2 with less carbide segregation — the answer when D2 edges keep micro-chipping under impact.
M2 / SKH51 (HSS)HRC 62–65Line speed above 200 m/min; thin stainless and silicon steelHigh speed steel keeps its red hardness when the edge gets hot, so it holds a keen edge far longer on hard, thin, fast-moving strip.
H13 / SKD61HRC 47–52Hot-rolled band and elevated-temperature slittingHot-work steel with outstanding thermal crack resistance — chosen when the strip itself is warm or the process runs hot.
Tungsten carbide YG15 / YG20HRA 89–92.5Extremely abrasive strip where steel knives wear out too fastCemented carbide holds the edge many times longer than tool steel, at the cost of lower shock tolerance — best on a stable, well-aligned line.

Not sure which grade fits your line? Tell us the material, the strip thickness, the coil width, the line speed and the knife clearance you run — our engineers will recommend the grade and edge geometry that gives the lowest cost per tonne slit.

Circular Slitting Knife Specifications

SpecificationStandard rangeNotes
Material gradeCr12MoV / D2 · Cr12Mo1V1 · 6CrW2Si · DC53 · M2 (SKH51) · H13 · Tungsten carbide YG15 / YG20Grade selected from the material you slit, the gauge and the line speed
HardnessAlloy tool steel HRC 55–63 · HSS HRC 62–65 · Carbide HRA 89–92.5Vacuum hardening and multiple tempering; hardness reported per batch
Outer diameter (OD)80–450 mm standard, larger on requestOD sets the shear angle — we match it to your slitter geometry
Thickness1–30 mmChosen with the strip gauge, the arbor and the required side load
Bore / mountingTo your shaft drawingPlain bore, keyway, spline, pin holes and bolt circles reproduced exactly
Thickness tolerance±0.003 mmThe single most important number for consistent knife clearance
OD tolerance±0.02 mmGround on CNC external grinders
Flatness & parallelism≤0.002 mmChecked on a granite surface plate before dispatch
Concentricity (bore to OD)≤0.005 mmPrevents axial runout and strip edge deformation
Edge angle90° shear edge as standardBevel, relief and micro-bevel angles set to your material and gauge
Surface finishRa 0.2–0.4 µm on both facesLow friction keeps the strip tracking straight and reduces material build-up
CoatingsTiAlN · TiN · DLC on requestFor high-speed lines and abrasive or sticky material
Edge conditionBurr-free and honedEvery blade edge-tested before packing
PackingEdge-protected, sealed export caseSuitable for sea and air freight

Values above are our standard production range. Send the machine model, the shaft drawing or a photo of the knife you are replacing with a ruler across it, and we will confirm the exact specification before quoting.

Typical Slitting Applications

01 / Metal Coil Slitting Lines

Steel & Coated Coil Slitting

Rotary shear knives for uncoiler – slitter – rewinder lines, holding a consistent clearance so the strip width stays true from the first metre to the last.

  • Cold-rolled, galvanised and zinc-coated strip, 0.2–3.0 mm
  • Hot-rolled pickled band and medium gauge, 3.0–6.0 mm
  • Pre-painted and colour-coated coil where edge marking must be avoided
02 / Silicon Steel & Electrical Steel

Silicon Steel Slitting

Thin, hard, brittle strip demands a keen edge and the tightest possible thickness tolerance, because any burr shows up later in the laminated core.

  • Grain-oriented and non-oriented silicon steel for transformer cores
  • Motor and generator lamination strip
  • HSS or DC53 grades for burr-free edges at high line speed
03 / Copper, Aluminium & Foil

Non-Ferrous & Foil Slitting

Soft, ductile metals smear easily, so the blade has to shear rather than crush. Polished faces and a correctly set bevel keep the cut clean and the coil free of debris.

  • Copper and brass strip for electrical and connector production
  • Aluminium foil and light gauge sheet
  • Battery and packaging foil slitting
04 / Stainless & High-Strength Strip

Stainless & HSLA Strip

Work-hardening grades put the hardest duty on the edge. Higher-alloy and hot-work grades resist chipping and thermal cracking when the going gets tough.

  • 304 / 316L stainless strip
  • HSLA and high-tensile steel where edge chipping is the limit
  • Rewinding, cut-to-length and building-material lines

Slitting a different material or running a special line? Send us the material, the strip thickness, the coil width, the line speed and the knife clearance you use — our engineers will specify the grade and edge geometry to match.

Why Source Slitting Knives from DEKEER

01 — Factory Direct

Manufacturer, not a trading company

Dekeer Precision Cutting Tools (Nanjing) forges, vacuum heat treats and CNC grinds every slitter knife in-house — from round bar stock to the finished, honed cutting edge.

02 — Precision Grinding

Thickness ±0.003 mm, parallelism ≤0.002 mm

Faces are ground on CNC surface grinders and the OD on CNC external grinders, then checked on a granite plate — the only way to hold a uniform knife clearance across a full arbor.

03 — Documented Quality

Hardness and dimensional report with every batch

Each shipment carries an HRC or HRA hardness report, a dimensional inspection of OD, bore, thickness and parallelism, plus a 100% edge check and crack detection where the duty demands it.

04 — After-Sales

12-month warranty and regrind support

12-month coverage against manufacturing defects, plus engineering advice on grade selection, clearance setting, safe regrind limits and grinding wheel choice for your line.

How a circular slitting knife order works, from inquiry to delivery

  • 1
    Send your specMachine model, shaft drawing or a used knife
  • 2
    Quote in 24 hGrade, OD, thickness and bore confirmed
  • 3
    Drawing confirmationYou approve the final specification
  • 4
    ProductionForging, heat treatment, CNC grinding
  • 5
    Final inspectionHardness, dimensions, parallelism, edge test
  • 6
    Export packingEdge-protected sealed cases, worldwide shipping

Frequently Asked Questions About Circular Slitting Knives

What is a longitudinal shear circular blade used for?
It is the rotary knife mounted on a slitting line arbor. A matched pair, top and bottom, shears the coil lengthwise into narrower strips as it unwinds. The same knife type runs on coil slitting lines, cut-to-length lines, rewinding machines and any equipment where a continuous strip has to be divided into several narrower widths.
Which material should I choose — alloy tool steel, HSS or carbide?
Cr12MoV (D2 / SKD11) is the standard choice for 0.2–3.0 mm cold-rolled, galvanised and coated strip. 6CrW2Si is the shock-resistant option for 3.0–6.0 mm medium and heavy gauge. DC53 suits high-impact slitting where D2 edges keep micro-chipping. M2 high speed steel (SKH51) is recommended when line speed exceeds 200 m/min or you are slitting thin stainless and silicon steel, because it holds its hardness when the edge runs hot. H13 covers hot-rolled band and warm strip. Tungsten carbide YG15 / YG20 gives the longest edge life on extremely abrasive material, but tolerates less shock.
What thickness tolerance do you hold, and why does it matter?
±0.003 mm, with flatness and parallelism within 0.002 mm. On a slitting line the horizontal knife clearance is the sum of every blade stacked on the arbor, so a few microns of thickness variation across the shaft changes the clearance from station to station — and that is what produces burrs, slivers and inconsistent strip width. Holding the thickness tight is how every station keeps cutting the same.
Can you machine the bore and keyway to match my shaft?
Yes. Plain bores, keyways, splines, pin holes and bolt circles are all machined to your drawing or measured from your existing knife. Send the shaft drawing, or a photo of the old knife with a ruler across it, and we will reproduce the mounting exactly so the knife goes straight onto the arbor.
What edge angle do you grind?
A 90° shear edge is standard for longitudinal shear knives, because the two knives work as a pair and the included angle governs the shear action. For very thin or soft material we grind a sharper included angle; for thick or high-tensile strip we open the relief and add a micro-bevel to protect the edge. Tell us the material and gauge and we will confirm the geometry before production.
How should I set the knife clearance?
Clearance is set as a percentage of strip thickness. As a starting point, roughly 5–8% of thickness suits mild and cold-rolled steel, a little more for stainless and HSLA, and less for aluminium and copper. Because the right figure depends on your material, gauge and line, we confirm a starting value with you and recommend fine-tuning from a test cut. What we guarantee is that the blades are parallel and thickness-matched, so whatever clearance you set stays constant across the arbor.
Do you supply matched sets for a whole slitting arbor?
Yes, and most customers order a full set so every station on the shaft has the same thickness and hardness. We keep the set matched through production and pack it together, which avoids the situation where one new knife has to run against a worn one.
Can the knives be reground, and how many times?
Yes. Alloy steel, HSS and carbide knives can be reground several times, as long as enough material remains to keep the bore and mounting correct and the hardened layer is not exhausted. Typical stock removal per pass is 0.01–0.05 mm depending on grade. Send us the knife and we will advise the safe regrind limit for your blade.
What information do I need to send for a quote?
Ideally the line manufacturer or machine model, the material and thickness you slit, the strip widths, and the knife OD, bore, keyway, thickness and hardness you run today. A drawing is perfect; a photo of the old knife with a ruler across it works too. With that our engineers normally confirm grade, dimensions and edge angle within 24 hours.
What is the usual lead time, and how do you ship?
Standard sizes are usually produced in 7–15 working days, while fully custom knives are confirmed individually at order stage. Every knife ships with edge protection in a sealed export case suitable for sea and air freight, and we deliver worldwide.

Related Products and Guides

Technical guides from our engineering team

Talk to a slitting knife engineer

Send your machine model, the material and gauge you slit, or a photo of the knife you are replacing with a ruler across it. Our engineering team will confirm the right grade, dimensions, bore and edge angle within 24 hours — free of charge and with no obligation.

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