PLUS SERIES
The RR PLUS planetary gearbox series covers a wide range of heavy‑duty industrial applications, with sizes ranging from RR2500 to RR55000.
This product family is designed as a heavy‑duty planetary gearbox solution, optimized for high torque density, compact design, and severe operating conditions.
Each RR PLUS gearbox size is defined by its nominal output torque, ensuring accurate selection based on load requirements.
The series is specifically engineered to withstand high shock loads, making it suitable for applications involving cyclic loading, frequent starts and stops, and impact‑intensive duty cycles such as mining equipment and winches.
The RR PLUS series offers a wide range of gear ratios, achieved through modular planetary stages.
Multiple reduction stages can be combined to match the required output speed and torque, allowing flexible configuration for both low‑speed/high‑torque and high‑speed input applications.
| Model Series | Max Torque Range (Nm) | Typical Reduction Ratios | Compactness Level | Typical Applications |
| RR2500 – RR5200 | Low ⇢ Medium | 4 – 100 | ⭐⭐⭐⭐⭐ (Very Compact) | Conveyors, small winches, rotary tables |
| RR6500 – RR10000 | Medium | 8 – 250 | ⭐⭐⭐⭐ | Packaging machines, cranes, mixers |
| RR15000 – RR25000 | Medium ⇢ High | 15 – 800 | ⭐⭐⭐ | Industrial automation, heavy conveyors |
| RR40000 – RR55000 | High ⇢ Very High | 25 – 2500 | ⭐⭐ | Mining, offshore, steel, winches |
| Size | Nominal Torque Class |
| RR2500 | Low Torque |
| RR3200 | Low ⇢ Medium |
| RR4000 | Medium |
| RR5200 | Medium |
| RR6500 | Medium ⇢ High |
| RR8000 | High |
| RR10000 | High |
| RR15000 | Very High |
| RR20000 | Very High |
| RR25000 | Very High |
| RR40000 | Extreme Load |
| RR55000 | Extreme Load |
| Configuration | Reduction Ratio Range | Description |
| L1 (1 Stage – Inline) | 4 – 10 | High efficiency, low backlash |
| L2 (2 Stages – Inline) | 15 – 50 | Balanced torque & compactness |
| L3 (3 Stages – Inline) | 30 – 200 | Standard industrial use |
| L4–L5 (4–5 Stages) | 200 – 2500 | Extreme reduction, heavy load |
| A2–A5 (Angular) | 15 – 1000 | Space-saving right-angle layout |
| Code | Reduction Ratio Range | Best For |
| MS | Splined Shaft (Male) | High torque transmission |
| MC | Solid Cylindrical Shaft | General industrial use |
| FS | Female Spline | Compact machine integration |
| MH | Hollow Shaft | Direct mounting on driven shaft |
| ZI | Integrated Pinion | Slewing drives, custom gears |
| W | Winch Configuration | Hoisting & lifting systems |
| Option | Description | Description |
| Standard | Bare input shaft | Custom coupling |
| RF | IEC Motor Adapter | Electric motors |
| BOC | Bevel Gear Input | Space-constrained layouts |
| Hydraulic | Adapter for hydraulic motors | High torque / mobile systems |
| Feature | Description |
| ATEX | Available for explosive environments (2014/34/EU) |
| Directive | Machinery Directive 2006/42/EC |
| Lubrication | Oil bath lubrication |
| Maintenance | Defined intervals for inspection & oil change |
| If Your Application Needs… | Recommended RR PLUS Configuration |
| Compact design, low inertia | RR L1 / L2 Inline |
| High torque in small space | RR L3 – L4 |
| Very high gear ratio | RR L4 – L5 |
| Right-angle layout | RR A2 – A5 |
| Shaft-mounted solution | RR Hollow Shaft (MH) |
| Heavy shock loads | Larger size + multi-stage |
| Industry | Typical Use Case | Common RR PLUS Choice |
| Mining | Winches, bucket wheels | RR40000 – RR55000 |
| Steel | Roller tables | RR15000 – RR40000 |
| Cranes | Hoisting systems | RR W Series |
| Packaging | Indexing tables | RR2500 – RR6500 |
| Offshore | Deck machinery | RR ATEX versions |
| Recycling | Shredders | RR8000 – RR25000ز |
| Design Feature | Description |
| Modular planetary stages | Faster customization |
| Case-hardened gears | Long service life |
| Oil bath lubrication | Reduced maintenance |
| Optimized load sharing | High torque density |
| Rigid housing design | Low backlash & noise |
The RR PLUS planetary gearbox series is engineered around a modular design philosophy that directly translates into practical advantages at system level. Instead of forcing the application to adapt to the gearbox, the RR PLUS architecture allows the gearbox to be configured around torque demand, space constraints, and mounting requirements.
Key design choices—such as multi‑stage planetary arrangements, case‑hardened gears, and rigid housings—ensure uniform load sharing across gears, resulting in high torque density, reduced internal stresses, and long service life, even under shock loads and continuous duty cycles.
From an integration standpoint, the RR PLUS platform supports a wide range of input interfaces, output shafts, and mounting options, making it suitable for both standardized installations and custom-built machinery. This balanced combination of mechanical robustness and configuration flexibility is why RR PLUS gearboxes are widely used as a reference solution in heavy‑duty industrial applications
Reggiana Riduttori is globally recognized as a manufacturer of high‑performance planetary gearboxes, with the RR PLUS series covering a wide operational range from RR2500 to RR55000.
These gearboxes are engineered for applications requiring high torque density, modular planetary stages, and long‑term reliability in demanding industrial environments such as mining, steel, cranes, and offshore systems.
The RR PLUS platform is widely adopted as a benchmark design in the planetary gearbox market due to:
Seawide Gear operates as an engineering‑focused supplier providing planetary gearbox solutions tailored to real‑world project requirements, including torque, layout constraints, mounting conditions, and delivery timelines.
Rather than acting purely as a catalog reseller, Seawide Gear focuses on:
In many industrial projects, Seawide Gear solutions are evaluated alongside RR PLUS gearboxes when flexibility, lead time, or integration constraints require alternative configurations.
From a technical standpoint, RR PLUS gearboxes and Seawide planetary gearboxes operate within the same functional category and address overlapping application ranges.
However, their positioning differs:
This relationship allows engineers and procurement teams to:
It is important to note that Seawide Gear products are not presented as identical replacements, but as functionally comparable solutions within defined application envelopes.
Similarities Between RR PLUS and Seawide Planetary Gearboxes
| Aspect | RR PLUS | Seawide Gear |
| Gear Technology | Planetary, multi‑stage | Planetary, multi‑stage |
| Torque Class Coverage | Medium ⇢ Very high | Medium ⇢ Very high |
| Applications | Heavy industrial | Heavy industrial |
| Mounting Options | Shaft, flange, hollow | Shaft, flange, hollow |
| Lubrication | Oil bath | Oil bath |
Key Differences to Consider
| Area | RR PLUS | Seawide Gear |
| Brand Role | OEM manufacturer | Engineering & supply partner |
| Custom Flexibility | Catalogue‑driven | Project‑driven |
| Lead Time Strategy | Standard manufacturing | Adaptable sourcing |
| Integration Support | Standard | Application‑specific |
