S Series Planetary Gearbox — Replacement for Brevini S300 to S20000, 34,000–2,170,000 Nm
S Series Planetary Gearbox, 34,000–2,170,000 Nm rated, peak to 5,400,000 Nm. Drop-in replacement for Brevini S300–S20000. IEC/NEMA & hydraulic inputs. 13 frame sizes in stock.
S Series · Drop-In Brevini Riduttori Replacement
S Series Industrial Planetary Gearbox — Replacement for Brevini S300 to S20000, 34,000–2,170,000 Nm
The S Series is a heavy-duty Planetary Gear Unit covering 13 frame sizes from S300 to S20000, with rated 10,000-hour torque from 34,000 Nm up to 2,170,000 Nm and peak torque capacity reaching 5,400,000 Nm. Mounting dimensions are fully consistent with Brevini Riduttori S-series units, and the performance parameters match closely enough for direct substitution — no interface modification required. The same dimensional interchangeability applies to equivalent models from Bonfiglioli, Bosch Rexroth, Comer Industries, Reggiana Riduttori, Rossi, and Zollern. This Planetary Speed Reducer is designed for the torque demands of conveyor drives, slewing rings, winch drums, and track-drive systems where continuous operation at rated load is the baseline, not the exception.
2,170,000 Nm
Max Rated Torque (10,000 h)
5,400,000 Nm
Peak Torque Capacity
13 Sizes
S300 → S20000
7 Brands
Cross-Compatible
S Series Planetary Gearbox — Torque Specifications by Frame Size
Rated torque figures are based on a 10,000-hour service life at continuous duty. Peak torque values represent the maximum permissible instantaneous load, applicable for brief shock events not exceeding 2 seconds in duration.
| Frame Size | Brevini Cross-Ref | Rated Torque @ 10,000 h (Nm) | Peak Torque (Nm) |
|---|---|---|---|
| S300 | Brevini S300 | 34,000 | 76,000 |
| S400 | Brevini S400 | 40,000 | 84,000 |
| S600 | Brevini S600 | 63,000 | 140,000 |
| S850 | Brevini S850 | 88,000 | 195,000 |
| S1200 | Brevini S1200 | 120,000 | 293,000 |
| S1800 | Brevini S1800 | 168,000 | 390,000 |
| S2500 | Brevini S2500 | 300,000 | 570,000 |
| S3500 | Brevini S3500 | 430,000 | 810,000 |
| S5000 | Brevini S5000 | 490,000 | 1,100,000 |
| S7500 | Brevini S7500 | 712,000 | 1,800,000 |
| S10000 | Brevini S10000 | 1,035,000 | 2,600,000 |
| S15000 | Brevini S15000 | 1,500,000 | 3,750,000 |
| S20000 | Brevini S20000 | 2,170,000 | 5,400,000 |
★ Peak torque values are for instantaneous shock events only. Continuous operation at peak torque will reduce service life below 10,000 hours.
Multi-Brand Cross-Reference for This Planetary Gear Unit
The S Series mounting dimensions and shaft interfaces are verified against 7 major drive brands. If your existing installation uses any of the models listed below, this unit drops in without re-engineering the machine interface.
Brevini Riduttori
S300–S20000
Bonfiglioli (Trasmital)
Equivalent S range
Bosch Rexroth
GFT / GFS series
Comer Industries
Equivalent range
Reggiana Riduttori
Equivalent range
Rossi
Equivalent range
Zollern
Equivalent range
Contact us with your existing model number and we will confirm the exact S Series frame size and variant that replaces it.
Key Design Features of the S Series Industrial Planetary Gearbox
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10,000-hour rated torque as the design baseline. Unlike catalogue ratings that use L10 bearing life at reduced load, the S Series torque figures are specified at 10,000 continuous operating hours at the stated Nm — the number that matters for maintenance planning in mining and bulk-handling operations. - →
Peak-to-rated ratio of 2.2× to 2.5× across all frame sizes. The S2500 runs 300,000 Nm rated and absorbs 570,000 Nm peak; the S20000 handles 2,170,000 Nm rated and 5,400,000 Nm peak. This margin accommodates the start-up and material-impact loads typical in industrial planetary gearbox for heavy duty applications without triggering overload protection. - →
Verified dimensional interchangeability with 7 OEM brands. Bolt circles, shaft diameters, keyway dimensions, and housing face profiles are matched to Brevini, Bonfiglioli, Bosch Rexroth, Comer, Reggiana, Rossi, and Zollern equivalents. The S Series Planetary Gearbox Replacement process requires no adapter plates, no re-drilling of machine frames, and no changes to the input coupling. - →
Modular input compatibility. Accepts flanged axial-piston hydraulic motors, orbit motors, IEC/NEMA electric motor flanges, and solid input shafts — the same input options across the full S300–S20000 size range, so a drive system designed around the S600 can be scaled to an S3500 without changing the motor interface type. - →
Output configurations for fixed plant and mobile equipment. Foot mount, flange mount, solid keyed output, splined hollow, and hollow-with-shrink-disc options cover the interface requirements of conveyor head pulleys, slewing rings, winch drums, and track drive sprockets without custom machining.
Applications — Planetary Gearbox for Conveyor and Mining Equipment
Bulk Conveyor Drives
The S1200–S2500 bracket (120,000–300,000 Nm) covers most overland conveyor head-pulley applications. The 10,000 h rated torque eliminates premature replacement shutdowns on 24/7 mine conveyor circuits.
Mining & Tunnel Boring
S5000–S20000 units (490,000–2,170,000 Nm rated) drive cutting-head slewing rings and cutter-drum gearboxes in hard-rock and soft-ground TBMs. Peak torque to 5,400,000 Nm covers cutter breakthrough events.
Winch & Hoisting Systems
Marine anchor winches, crane hoists, and shaft-sinking kibble winches. The hollow output shaft on S600–S3500 accepts the drum shaft directly; no intermediate coupling needed.
Track Drive Systems
Crawler excavators, drilling rigs, and pipe-laying machines where the track-drive gearbox must fit inside the track frame envelope. S Series mounting matches Bosch Rexroth GFT track-drive dimensions.
Slewing & Rotary Drives
Port cranes, offshore derrick platforms, and large excavator swing drives. The S3500–S10000 range (430,000–1,035,000 Nm) covers swing-drive requirements up to 700-tonne crane class.
Complete Drive Package — Components That Work Directly with the S Series Planetary Speed Reducer
Pairing the S Series with matched input and output components reduces commissioning time and eliminates interface uncertainty. All items below are available from our catalogue.
| Component | Specification | Interface with S Series |
|---|---|---|
| High-Power Electric Motor | IE3, 55–500 kW, 4/6-pole, IEC B5 flange | Flanges directly to IEC adaptor on S300–S3500 input; no intermediate coupling on flanged version |
| Hydraulic Axial-Piston Motor | SAE B/C/D flange, 160–1,000 cc/rev displacement | Bolts to flanged hydraulic input port; common on mobile S-series winch and track-drive builds |
| Winch Drum Assembly | Ø 400–800 mm, 16–32 mm wire rope, SWL 20–200 t | Mounts on hollow output or shrink-disc flange; S1800–S7500 frame matches most heavy-lift winch drum bores |
| Heavy-Duty Drive Sprocket | ANSI #160–#240 roller chain, 13–19T, splined or keyed bore | Fitted to splined output on S300–S1200 for chain-driven conveyor and track applications |
| Torsionally Rigid Disc Coupling | 50,000–500,000 Nm, steel disc pack, SAE flywheel pattern | Connects motor shaft to S Series input; absorbs angular misalignment up to ±0.5° without adding axial load to input bearings |
FAQ — S Series Industrial Planetary Gearbox
Ready to Replace or Upgrade?
Order the S Series Planetary Gearbox — S300 to S20000 in Stock or Built to Schedule
Send us your existing model number (Brevini, Bonfiglioli, Bosch Rexroth, or other), the required torque, input configuration, and quantity. We confirm the replacement frame size and deliver a firm price and lead time within 24 hours.
S300–S20000 · 13 frame sizes · 7 brand cross-references · Volume pricing from 3 units
