The double shaft shredder blade, also known as a twin-shaft shredder knife or dual-shaft cutter, is the core wear-resistant component of industrial shredding equipment. Blade material quality, heat treatment hardness, and installation precision directly determine shredding efficiency, output particle size uniformity, and overall equipment service life.

Our blades feature a helical mounting configuration with precision spacer sleeves maintaining 0.2–0.3mm axial clearance between adjacent blades. This engineered gap prevents blade-to-blade collision during high-torque operation while optimizing cutting force distribution. Blade thickness and tooth count are selected based on target material size reduction requirements: higher tooth counts with reduced spacing for fine shredding of film and rubber, fewer teeth with increased spacing for bulky wood, metal scrap, and tire processing.

The spiral arrangement ensures continuous cutting action across the full shaft length, eliminating dead zones and reducing vibration. Proper installation torque and sequential blade positioning are critical to achieving balanced rotation and extending bearing service life.

With the development and innovation of the blade industry, the quality of the raw materials of the blade is increasing. The double shaft shredder blades are commonly used in a variety of materials, and the materials are generally selected according to different processing objects:

Common materials used in the plastic industry are 42CrMo, W5SiCr, SKD-11;
Common materials used in the metal industry are: 6CrW2Si, Cr12Mov, LD, H13;
Common materials used in the wood industry are: 5WSiCr, 6CrW2Si, SKH, SKD-11, D2;
The heat treatment reached HRC 55-57.

It is crucial to choose the appropriate blade based on the different materials of the shredder’s shredded products. The following are recommended blade types based on material:
Rubber and film shredding:
Choose Cr12MoV blades. This type of blade has good hardness and wear resistance, making it suitable for handling materials with strong flexibility but low hardness such as rubber and film.
Cut wood and plastic into small pieces:
Use 55SiCr blades. 55SiCr blades are highly suitable for processing materials with high hardness and toughness, such as wood and plastic. Meanwhile, it is also suitable for shredding waste flowers and flower iron mixtures.
Metal product shredding:
55SiCr blades are highly suitable for processing non-metallic materials such as wood and plastic due to their high hardness and toughness. They are also suitable for shredding waste flowers and flower iron mixtures. For the crushing of metal products, we recommend using H13 blades, which are a type of hot work mold steel with good comprehensive performance at medium temperatures, high hardenability, low heat treatment deformation rate, and high temperature resistance. This makes H13 blades excellent in shredding metal products, with minimal deformation and the ability to maintain sharpness and durability for a long time.

Double Shaft Shredder Blade Process Protection:

	More than 10 processes are completed independently No outsourcing and cost saving With a full set of processing equipment, from forging, finishing to heat treatment processing, a full set of processes to complete independently, eliminate the process outsourcing, reduce the machining cost of mechanical blades, truly benefit customers
New vacuum heat treatment process Technical precision and high quality The new heat treatment technology is used to accurately set the heat treatment process parameters to ensure the high strength, high hardness and high toughness of the workpiece after heat treatment. At the same time, the surface phosphorus chips are removed to improve the surface brightness of the blade
	Strictly check every process The materials used are of high standard According to the size and appearance requirements, each process is strictly in accordance with the standard operation, in 200℃ high-temperature stress, heat preservation longer than 2h, quenching 8h, scientific forging ratio, to ensure the processing accuracy, eliminate jacking

Commonly used double shaft shredder blades. The inner hole is generally an inner hexagon, and the outer circumference commonly has three claws, six claws, eight claws, and twelve claws. The number of jaws, the clearance and the distance from the blade to the spacer determine the size of the shredded material. Generally, the double shaft shredder blades are available in diameters from 200mm to 500mm and thicknesses from 20mm to 55mm. They can also be customized according to customer needs.

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