FLENDER Gearboxes, Planetary Drives & Couplings
Recognized globally for extreme torque performance and mechanical durability, FLENDER sets the industry standard for power transmission. Discover our comprehensive catalog covering Universal Helical & Bevel-Helical Gear Units (H & B series), Industrial Planetary Drives (PLANUREX, NEO PLANUREX, SIP, FLENDER ONE, DUORED), MOTOX Series Modular Gearmotors (originally developed by Siemens/Flender, transferred under Innomotics, and continuously supported via original OEM manufacturing), and High-Performance Industrial Couplings (N-EUPEX, RUPEX, ZAPEX, ARPEX, FLUDEX). WE DRIVE HONGKONG LIMITED supplies 100% original Flender equipment, spare parts, and exact 1-to-1 replacement units worldwide.
Heavy duty parallel shaft helical and right-angle bevel-helical gear reducers for severe conveyor, mill, and elevator drives.
H SERIES
Helical Gear Units
(H2, H3, H4 Frame 3 - 26)
B SERIES
Bevel-Helical Gear Units
(B2, B3, B4 Frame 3 - 26)
High torque density coaxial and right-angle planetary speed reducers for heavy mining, cement, and material handling.
PLANUREX 3
Premium Planetary Gear Units
(L3, P3 Frame Sizes)
NEO PLANUREX
Direct-Coaxial Planetary
(N3 High Power Density)
SIP SERIES
Standard Industrial Planetary
(Modular Industrial Reducer)
FLENDER ONE
Single-Stage Helical Drives
(Paper & Pump Efficiency)
DUORED
Dual-Power Planetary Drives
(Heavy Mill Reducers)
Brand Note: Originally designed and built by Flender/Siemens, the MOTOX gearmotor lineup transitioned under Siemens' Innomotics motors carve-out and continues production through original OEM factory channels under its legacy design standard.
MOTOX D/Z
Coaxial Helical Gearmotors
(D/Z 18 - 188 Range)
MOTOX F
Parallel Shaft Gearmotors
(F 28 - 188 Range)
MOTOX K
Helical-Bevel Gearmotors
(K 38 - 188 Range)
MOTOX C
Helical-Worm Drives
(C 08 - 88 Range)
Precision shaft couplings for vibration damping, axial misalignment, and heavy torque transmission.
N-EUPEX
Flexible Pin & Bush Couplings
(Types A, B, H, DS)
RUPEX
Shock-Damping Pin Couplings
(RWN, RWB Heavy Duty)
ZAPEX
Heavy-Duty Gear Couplings
(ZWN, ZWB High Torque)
ARPEX
All-Steel Disc Couplings
(Torsionally Rigid No-Wear)
FLUDEX
Fluid Hydrodynamic Couplings
(Smooth Startup Protection)
Flender Power Transmission Range Technical Specifications Matrix
Comprehensive selection matrix across Flender heavy industrial gearboxes, planetary speed reducers, MOTOX gearmotors, and flexible couplings:
| Category & Series | Frame / Model Sizes | Torque / Power Capacity | Gearing / Coupling Type | Primary Industrial Applications |
|---|---|---|---|---|
| H Series (Helical Gear Units) | H2, H3, H4 (Sizes 3 - 26) | 6,800 Nm - 900,000 Nm | Parallel Shaft Helical Ground Tooth | Mining Conveyors, Bucket Elevators, Agitators |
| B Series (Bevel-Helical Units) | B2, B3, B4 (Sizes 3 - 26) | 6,800 Nm - 900,000 Nm | Right-Angle Bevel-Helical Spiral Bevel | Crushers, Mixers, Heavy Duty Conveyor Drives |
| PLANUREX 3 (Planetary) | L3, P3 (Sizes 010 - 100) | 22,000 Nm - 5,450,000 Nm | Coaxial & Right-Angle Planetary | Kiln Drives, Sugar Mills, Mining Excavators |
| MOTOX Geared Motors | D/Z, F, K, C (Sizes 18 - 188) | 0.12 kW - 200 kW / 20,000 Nm | Modular Inline, Parallel & Bevel Motors | Logistics, Material Handling, Food Processing |
| N-EUPEX Flexible Couplings | Sizes 58 - 710 | 19 Nm - 85,000 Nm | Flexible Pin & Bushing (NBR / Polyurethane) | Pump Drives, Compressor Shafts, Motor Output |
| ZAPEX Gear Couplings | ZWN / ZWB (Sizes 80 - 1000) | 1,300 Nm - 7,200,000 Nm | Curved-Tooth Heavy Gear Coupling | Rolling Mills, Cranes, Steel Processing Lines |
Flender Industrial Gearbox Replacement & Cross-Reference Guide
Direct replacement guide for legacy Flender reducers and older Siemens drive packages:
| Legacy Flender / Siemens Unit | Common Failure / Wear Factors | Current Flender Replacement | Key Performance & Engineering Upgrades |
|---|---|---|---|
| Legacy Flender REDUREX Gearbox | Housing seam oil leaks and thermal overheating on heavy conveyor drives | Flender H / B Series (Frame 3-26) 100% Drop-In Replacement | Rigid cast-iron housing, optimized gear tooth mesh, and optional fan cooling package. |
| Legacy PLANUREX 2 Planetary Drive | Internal planetary carrier bearing fatigue under high shock loads | PLANUREX 3 / NEO PLANUREX High Torque Density | Increased power density, reinforced planetary pin bearings, and extended wear life. |
| Siemens MOTOX-N Geared Motors | Motor brake wear or terminal box sealing degradation | MOTOX / Innomotics Modular Geared Motors OEM Exact Match | Preserves foot/flange dimensions, hollow shaft diameter, and terminal box positions. |
Expert Technical Sourcing & System Integration Notes
By providing us with your existing Flender nameplate order code or serial number (e.g., H2SH 08 - 2003456-010-1 or N-EUPEX A 200), our engineering team verifies exact shaft extension dimensions, ratio verification, thermal rating requirements, and mounting positions to guarantee a 100% compliant replacement quotation and rapid delivery.
Core Benchmark Model Standard Configurations
- FLENDER H2SH 04 Helical Unit
- FLENDER H2SH 08 Helical Unit
- FLENDER H3SH 10 Helical Unit
- FLENDER B3SH 06 Bevel Reducer
- FLENDER B3SH 12 Bevel Reducer
- FLENDER B4SH 16 Bevel Reducer
- PLANUREX 3 P3LA 10 Planetary
- PLANUREX 3 L3NA 14 Planetary
- NEO PLANUREX N3 Coaxial Drive
- SIP 08 Standard Industrial Planetary
- MOTOX D88-M90L4 Gearmotor
- MOTOX F68-M80M4 Gearmotor
- MOTOX K108-M112M4 Gearmotor
- N-EUPEX A 140 Flexible Coupling
- N-EUPEX B 200 Flexible Coupling
- RUPEX RWN 250 Pin Coupling
- ZAPEX ZWN 125 Gear Coupling
- ARPEX ARS-6 Steel Disc Coupling
- FLUDEX FAD 315 Fluid Coupling
- Flender Conveyor Drive Reducer
