Saturn Machine Knives Ltd is the manufacturer of the world-renowned Rotatech Brand of shredder block knives, also known as crown knives.

Single shaft shredding is a very demanding process where mixed waste and materials are not always properly controlled as input materials. This sector requires shredder block knives which can work under very demanding conditions. All our shredder block or crown knives are manufactured using high-quality tool steel grades specifically designed for these applications to ensure good wear resistance and long life. The material, usually D2 or 12% chrome steel is sourced from our accredited suppliers in both the UK and Europe.

Submit an enquiry today and see how Saturn Machine Knives can reduce your machine knife replacement costs.

  • Rotatech shredder knives will give you long life and lower operating costs against OEM parts
  • We supply shredder blocks and counter knives for any make or model of single shaft shredders including – Weima, Ulster, SSi, Untha, Vecoplan and many more
  • Many parts come from our stock, or they can be made to customers’ orders. We have the shortest manufacturing lead time in the UK.

All heat treatment is carried out by our Aerospace certified subcontracting partner to OEM specification. All our parts are vacuum heat-treated to ensure that any threaded holes are clean and free from scale, which is very important for this part to allow quick and problem-free fitting

Manufacturing is carried out in our Sheffield facility using the latest CNC machinery to ensure consistent quality time and time again. You can be confident you’re getting a British made product. Having Saturn Machine Knives Ltd supplying your single shaft shredder blocks will mean that you get the very best quality, service and value available on the market today.

Call our team today on +44 (0)114 278 90 90 or email us at for comprehensive guidance and advice around our range of industrial machine knives. When you choose Saturn Machine Knives as your blade supplier, you’re joining a large network of customers who trust the performance and quality of our Rotatech products.

"Great for doing regrinding.Took 6 working days to return the blades once they were dispatched though."

"I can’t recommend these guys highly enough for the complete and professional service ..."

"Never had any issues here. Next day delivery always arrives on time, handy for my business!."