High-performance rotor knives and flat blades to maximise shredding efficiency

Find matching rotor knives quickly for reliable material reduction

Metav supplies high-performance rotor knives and flat knives for shredding and size-reduction applications. The range covers straight-edged long blades as well as alternative geometries, all specified to match the product lines of many established machine builders.

How rotor and flat knives work in your process

Rotormesser act as the primary cutting elements inside a grinding or shredding chamber. The rotating cutting rotor carries the blades, which work against a fixed stator knife block mounted to the rear wall of the chamber. Flat knives (also called long knives) feature a straight cutting edge and a slim profile; differences in hardness and grinding technology create distinct performance profiles for stand time, process safety and final product quality. Alternative rotor knife types such as cutting crowns, karo knives and concave knives are available in a separate category.

Clear operational benefits you can rely on

• Compatibility with over 30 machine manufacturers for rapid replacement and reduced machine downtime.
• Improved stand time through selectable hardness and advanced grinding technologies.
• Higher process security by matching rotor knife geometry to the application.
• Consistent product quality via optimised blade profiles.
• Efficient sourcing and filtering to find the correct rotor knife for specific machine models.

Why Metav is the practical choice for workshops and industry

As a precision partner based in Emmerich, Metav acts as a quality filter for the European market and makes high-accuracy components accessible to every workshop. With decades of expertise and more than 48,000 customers, Metav combines a comprehensive assortment with dependable supply from a single source. The range includes blades for manufacturers such as Herbold, Alpine Hosokawa, STF, Condux, Eldan, Neue Herbold, Amis Zerma, Getecha, Wanner and Previero.

Short summary

Metav rotor knives and flat knives deliver reliable cutting performance, simple compatibility and measurable improvements in stand time and product quality.

Key technical data

• Compatible with: Herbold; Alpine Hosokawa; STF; Condux; Eldan; Neue Herbold; Amis Zerma; Getecha; Wanner; Previero; and others
• Flat knife characteristics: straight cutting edge; flat design; also referred to as long knives
• Performance variables: hardness grades; grinding technologies
• Rotor knife function: mounted on cutting rotor; works against fixed stator knife block
• Available rotor geometries: flat knives; cutting crowns; karo knives; concave knives
• Filter system: product-line filters for quick identification of matching rotor knives

FAQ

How do I choose the correct rotor knife for my machine?
Select the rotor knife by matching the blade geometry and mounting dimensions to your machine’s product line; use Metav’s filters that list compatible models for many manufacturers to ensure the rotor knife and stator block align correctly.

What advantages do flat knives offer compared with other rotor knife types?
Flat knives provide a straight cutting edge and a compact profile, offering simple sharpening, predictable wear patterns and easy replacement; for specialised requirements, Metav also supplies cutting crowns and concave designs.

Can I expect improved stand time from a different grinding technology?
Yes. Changes in hardness and grinding technology alter the blade’s wear resistance and cutting behaviour, which can extend stand time and enhance process security when the correct combination is chosen.

Are specialised geometries available for specific shredding tasks?
Metav stocks a range of rotor geometries—including cutting crowns, karo knives and concave knives—each intended for particular material behaviours and product-quality goals; these are listed in a dedicated product rubric.