Rotor knives, counter knives and wear parts for single- and multi-shaft shredders — built for impact and abrasive feed, made to your machine’s clamping pattern.
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Dimensions, steel grade and hardness are set per order. Where feed material is abrasive, we discuss the trade-off between hardness and toughness before quoting.
All trademarks belong to their owners. A brand listed here indicates that our parts are compatible with that manufacturer’s machines; it does not imply partnership or authorisation.
All trademarks belong to their owners. A brand listed here indicates compatibility with that manufacturer’s machines; it does not imply partnership or authorisation.
Steellogy manufactures heavy-duty industrial knives for recycling, including granulator knives, shredder blades, pelletizer knives and counter knives for plastics, rubber, wood waste, e-waste and mixed streams. They are made in our own facility in Poland, with material and hardness agreed for each order.
Granulator knives are the cutting core of size reduction equipment: rotor knives cut against fixed stator (bed) knives in a shearing action until the material is small enough to pass through a screen. The rotor-to-stator gap and edge condition govern regrind quality — worn knives produce oversized particles, more fines, and higher energy use.
Steellogy uses D2 / 1.2379 as the standard grade for granulator knives. For hardness we follow the steel producer's own application guidance — Uddeholm's Sverker 21 datasheet lists 56–60 HRC for granulator knives — with the delivered hardness agreed per order and stated on the confirmation. Our granulator blades are compatible with machines from manufacturers including Zerma (GSH-series), Herbold, Cumberland, Rapid and Hellweg, supplied as rotor and stator knives to the drawing.
Industrial shredder blades take impact and abrasion from heterogeneous waste streams. Whether shredding plastics, tires, wood waste or electronic waste, shredder knives face unpredictable loads from mixed materials, contaminants and tramp metal — so toughness comes before peak hardness. Steellogy shredder blades are manufactured from cold-work tool steels, using D2-class steel as the baseline, with grades such as DC53 and A8 commonly used for tougher duty; heat treatment is done in-house.
Our shredder blades are compatible with machines from Vecoplan, Lindner, UNTHA, WEIMA, SSI Shredding Systems and other shredder manufacturers, in single-shaft, dual-shaft and four-shaft configurations.
Pelletizer knives cut extruded plastic strands into uniform pellets in the final stage of plastics recycling. Variations in blade geometry show up directly as irregular pellet shapes and processing problems downstream, so the knives are ground to drawing-controlled tolerances. For underwater and water-ring systems, the grade is selected for corrosion resistance and confirmed on the quotation.
Steel grade follows the feedstock. For standard plastics granulation, D2 / 1.2379 is used with hardness set according to the steel producer's application guidance above. For glass-filled or mineral-filled plastics, we quote PM (powder-metallurgy) cold-work steels or tungsten carbide where the application justifies it — always as a named grade with its producer datasheet, since PM designations are grade-specific and not interchangeable. Shredder duty favours tougher cold-work grades such as DC53 and A8-class that resist impact and tramp-metal contamination. For a broader overview, see our guide to selecting industrial knives — the same metallurgical principles apply across sectors. Send the material stream and throughput with the enquiry and the grade is confirmed on the quotation.
Steellogy manufactures industrial knives for recycling in Europe. We supply granulator knives, shredder blades and pelletizer knives to recycling operations across the EU. Material, hardness and acceptance requirements are agreed for each order. If material-documentation, hardness-measurement or dimensional-inspection requirements are included in the RFQ, their availability and scope are confirmed in the quotation. For sourcing context, see our analysis of OEM and aftermarket industrial knives. Contact Steellogy for a quotation.
Each of these three sourcing situations calls for a different qualification process. Choose the route that fits your requirement.
When the part is already defined, reliance on one supplier is a risk to continuity of supply rather than a technical issue. The aim is to have an independent manufacturer supply the part to the same definition.
See how second-source qualification worksSend a second-source RFQWhen the machine builder no longer supplies the part, the starting point is what remains available: a partial drawing, a part number with its revision, or the worn part itself.
See how a legacy part is assessedSend a legacy-part RFQOnce a part has been qualified, the economics depend on repeatability: the part can be reordered with the same approved revision, material and inspection scope, without repeating the qualification process.
See how repeat orders are handledSend a repeat-part RFQBatch documentation, company data and commercial terms for supplier qualification are summarised on the Supplier information page.