Twin Shaft Shredder — Low-Speed, High-Torque Mobile Units
All five UPSEN mobile shredders use twin-shaft cutting: shaft speed up to 45 r/min, reducer torque from 160,000 to 400,000 N·m, and HARDOX 500 or NM 500 tooling. Rated throughput runs from 15 t/h on wood waste to 200 t/h on C&D debris.
Get A QuoteØ730 mm knife disc on 2 models
Model dependent
Low speed, high torque
Wear-plate cutters
How Twin-Shaft Cutting Works
The principle is slow rotation with a large turning moment, not a fast strike. That is what lets the machine take bulky, mixed and metal-bearing feed that is not suitable for a crusher.
The cutting element is a shaft — Ø680 × 1550 mm on the UMS250 and T-MS250, Ø860 × 2500 mm on the UMS950 — or a 2000 mm spindle carrying Ø730 mm knife discs on the UMS750 and UFS750.
The gear reducer supplies 160,000 to 400,000 N·m. High torque at low speed is what keeps a bulky feed moving instead of stalling.
Shaft speed is 0-40 r/min on the UMS250, 0-42 r/min on the UMS750 and 0-45 r/min on the UMS950, UFS750 and T-MS250. Low rotational speed means the cutters meet the material rather than striking it.
The machine does not set the final size — the screen configuration does. Change the screen to change the fraction, then an over-belt magnet removes ferrous metal from what comes off the belt.
Twin Shaft Geometry and Torque by Model
Shaft or knife-disc size, cutting speed, reducer torque, tooling and operating weight. Capacity by material is on the industrial waste shredder page.
| Model | Mount | Cutting element | Speed | Reducer torque | Tooling | Weight |
|---|---|---|---|---|---|---|
| UMS250 | Tracked | Shaft Ø680 × 1550 mm | 0-40 r/min | 160,000 N·m | HARDOX 500 / NM500 | 18,000 kg |
| UMS750 | Tracked | Knife disc Ø730, spindle 2000 mm | 0-42 r/min | 240,000 N·m | HARDOX 500 (NM500) | 28,000 kg |
| UMS950 | Tracked | Shaft Ø860 × 2500 mm | 0-45 r/min | 400,000 N·m | HARDOX 500 | 49,000 kg |
| UFS750 | Tracked | Knife disc Ø730, spindle 2000 mm | 0-45 r/min | 240,000 N·m | HARDOX 500 (NM500) | 24,000 kg |
| T-MS250 | Wheeled | Shaft Ø680 × 1550 mm | 0-45 r/min | 160,000 N·m | NM 500 | 19,000 kg |
UMS250 and T-MS250 share the same shaft and reducer; the difference is the undercarriage — steel tracks versus four car tyres and a 13 × 2.4 × 3.2 m transport size.
When Twin-Shaft Is the Right Choice
Four signals that the stream belongs in a shredder rather than a crusher.
Feed that will not enter a jaw opening without pre-cutting: timber, pallets, bales, large mouldings, domestic bulky waste.
Fibrous, springy or mixed material that a compression crusher cannot grip. Wood, biomass, carpet, cable-bearing scrap.
Mixed C&D and scrap with ferrous contamination. The magnet recovers the steel after the cut instead of the crusher stalling on it.
Streams that change composition shift by shift. A shredder reduces to a recyclable fraction; grading to a specification is done downstream by a screener.
Where to Go Next
The application page, the parent range, and the equipment that runs downstream.
The application side of the same range: what each model does on C&D debris, MSW, wood and scrap metal.
See throughputs →Five models, four tracked and one wheeled, from 15 t/h on wood to 200 t/h on C&D debris.
See the range →When the stream is hard rock or reinforced concrete, a jaw or impact crusher is the correct first machine.
See crushers →Tracked scalpers and trommels that size shredded output into saleable fractions.
See screeners →Crusher or shredder for construction and demolition waste — how to decide from the material mix.
Read the guide →Clear output from a continuously running shredder without a wheel loader.
See conveyors →Twin Shaft Shredder — FAQ
Shaft, torque and tooling questions from specification engineers
What is a twin shaft shredder?+
A shredder that reduces material with two shafts carrying cutters, turning slowly with high torque rather than striking the feed at speed. Every UPSEN mobile shredder — UMS250, UMS750, UMS950, UFS750 and T-MS250 — uses this principle. It is also described as a double shaft shredder.
What torque and shaft size do these models use?+
Shaft size is Ø680 × 1550 mm on the UMS250 and T-MS250, and Ø860 × 2500 mm on the UMS950; the UMS750 and UFS750 run Ø730 mm knife discs on a 2000 mm spindle. Reducer torque is 160,000 N·m (UMS250, T-MS250), 240,000 N·m (UMS750, UFS750) and 400,000 N·m (UMS950).
At what speed does a twin shaft shredder run?+
0-40 r/min on the UMS250, 0-42 r/min on the UMS750 and 0-45 r/min on the UMS950, UFS750 and T-MS250. Low speed is what allows the high torque to be applied without the wear that high-speed impact produces.
What are the cutters made of?+
HARDOX 500 / NM 500 wear plate on the UMS250, UMS750 and UFS750, HARDOX 500 on the UMS950 and NM 500 on the T-MS250.
Is a twin shaft shredder right for concrete and rock?+
No. Twin-shaft shredding suits bulky, tough and metal-bearing waste. Hard rock, reinforced concrete and asphalt are reduced by compression or impact — use a mobile jaw or impact crusher for those, and a shredder where the stream is timber, MSW, cable-bearing scrap or mixed C&D.
Can a twin shaft shredder handle metal?+
On the UMS950 it is rated 25-30 t/h on scrap metal. An optional over-belt magnet recovers ferrous metal from the output before the product is stockpiled.
How much does a twin shaft shredder cost?+
Price depends on model, screen configuration, magnet and drive option, and destination. Send the material and the output size you need and we return a configured quotation.
Which shaft and torque do you need?
Send the material, the bulkiest item and the output size. We map it to a shaft and torque rating and return a configured quotation.
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