Description
WPA Single Speed Worm Gear Reducer — Dependable High-Torque Foot-Mounted Drive for Industrial Applications
In production environments where reliable speed reduction and maximum torque delivery must coexist, the WPA worm gear reducer stands as the benchmark general-purpose solution. Its precision worm-and-wheel set converts high-speed motor output into the steady, high-torque rotation demanded by belt conveyors, industrial mixers, grain augers, and process-drive systems — all housed within a rugged foot-mounted cast iron worm gearbox designed to withstand shock loading, dust ingress, and demanding 24/7 operation.
Available in 13 frame sizes (40–250 mm centre distance) with nine standard reduction ratios (1/5 to 1/60), the WPA single-speed worm gearbox covers output torques from 17 Nm up to 2,371 Nm. Five configurable shaft-direction positions (A–E) mean the unit adapts to your machine layout — not the reverse. Learn about Ever-power or request a free selection guide.
Technical Specifications
Full dimensional data for all WPA sizes. Input speed reference: 1500 r/min. All dimensions in mm.
| Size | Ratio | A | AB | B | BB | CC | H | HL | M | N | E | F | G | Z | HS | U | T×V | LS | S | W×Y | Wt(kg) | Oil(L) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 40 | 1/5–1/60 | 143 | 87 | 114 | 74 | 40 | 138 | 40 | 90 | 100 | 70 | 80 | 13 | 10 | 25 | 12 | 4×2.5 | 28 | 14 | 5×3 | 4 | 0.13 |
| 50 | 175 | 108 | 150 | 97 | 50 | 176 | 50 | 120 | 140 | 95 | 110 | 15 | 12 | 30 | 12 | 4×2.5 | 40 | 17 | 5×3 | 7 | 0.17 | |
| 60 | 198 | 120 | 168 | 112 | 60 | 204 | 60 | 130 | 150 | 105 | 120 | 20 | 12 | 40 | 15 | 5×3 | 50 | 22 | 7×4 | 10 | 0.22 | |
| 70 | 231 | 140 | 194 | 131 | 70 | 236 | 70 | 150 | 190 | 115 | 150 | 20 | 15 | 40 | 18 | 5×3 | 60 | 28 | 7×4 | 15 | 0.60 | |
| 80 | 261 | 160 | 214 | 142 | 80 | 268 | 80 | 170 | 220 | 135 | 180 | 20 | 15 | 50 | 22 | 7×4 | 65 | 32 | 10×4.5 | 20 | 0.85 | |
| 100 | 322 | 190 | 254 | 169 | 100 | 336 | 100 | 193 | 270 | 155 | 220 | 25 | 15 | 50 | 25 | 7×4 | 75 | 38 | 10×4.5 | 35 | 1.50 | |
| 120 | 371 | 219 | 282 | 190 | 120 | 430 | 120 | 233 | 320 | 180 | 260 | 30 | 18 | 65 | 30 | 7×4 | 85 | 45 | 12×4.5 | 60 | 3.20 | |
| 135 | 422 | 249 | 317 | 210 | 135 | 480 | 135 | 253 | 350 | 200 | 290 | 30 | 18 | 75 | 35 | 10×4.5 | 95 | 55 | 16×6 | 80 | 3.60 | |
| 147 | 432 | 256 | 320 | 210 | 147 | 460 | 123 | 250 | 350 | 200 | 280 | 32 | 18 | 75 | 35 | 10×4.5 | 95 | 55 | 16×6 | 98 | 3.70 | |
| 155 | 497 | 295 | 382 | 252 | 155 | 531 | 135 | 275 | 390 | 220 | 320 | 35 | 21 | 85 | 40 | 12×5 | 110 | 60 | 18×7 | 110 | 3.80 | |
| 175 | 534 | 314 | 388 | 255 | 175 | 600 | 160 | 310 | 430 | 250 | 350 | 40 | 21 | 85 | 45 | 14×5.5 | 110 | 65 | 18×7 | 150 | 4.60 | |
| 200 | 580 | 342 | 456 | 319 | 200 | 666 | 175 | 360 | 480 | 290 | 390 | 40 | 24 | 95 | 50 | 14×5.5 | 125 | 70 | 20×7.5 | 215 | 6.50 | |
| 250 | 703 | 420 | 552 | 385 | 250 | 800 | 200 | 460 | 560 | 380 | 480 | 45 | 28 | 110 | 60 | 18×7 | 155 | 90 | 25×9 | 360 | 9.00 |
* HS=input shaft bore; U=input shaft length; T×V=keyway; LS=output shaft length; S=output shaft diameter; W×Y=output keyway.
Product Structure
The WPA features a foot-mounted housing in which the worm shaft (input) and worm wheel shaft (output) are arranged at 90°. The sealed cast iron body retains a splash-lubrication oil bath with a breather plug on top and an oil-sight glass for maintenance monitoring.
| Housing | FC25 grey cast iron, CNC precision-machined mating faces |
| Worm Shaft | 20CrMnTi carburised & ground, ≥58 HRC surface hardness |
| Worm Wheel | ZCuSn10Pb1 tin-bronze rim, ductile iron hub |
| Bearings | C3 deep-groove ball bearings; tapered roller on output (large sizes) |
| Seals | Double-lip NBR oil seals on all shaft exits |
| Lubrication | Splash oil bath; N220–N320 mineral or synthetic gear oil |
| Shaft Positions | 5 configurable orientations: A, B, C, D, E |
✅ Key Features & Benefits
️ Rugged Cast Iron Housing
The FC25 grey cast iron enclosure delivers outstanding impact resistance and vibration damping — essential for mining conveyors, aggregate plants, and any duty subject to shock loading. Ribbed side panels provide natural convection cooling, maintaining safe oil temperatures during 24/7 continuous operation. Keywords: heavy-duty cast iron gearbox, rugged worm drive housing.
⚙️ Precision Worm & Wheel Set
Ground-tooth worm shaft mates with ZCuSn10Pb1 bronze wheel to ISO 1328 Grade 7 tolerances, delivering smooth, low-noise power transmission (≤72 dB(A) at rated load). Transmission efficiency of 60–90% depending on ratio, with self-locking available at ratios 1/30 and above. Keywords: precision worm gear reducer, low-noise worm gearbox.
Five-Way Shaft Flexibility
Standard positions A through E accommodate virtually any drive-train layout, simplifying integration into new designs and retrofits without structural modification — reducing coupling components and installation time significantly.
Wide Size & Ratio Coverage
13 frame sizes (40–250 mm) and 9 ratios (1/5–1/60) deliver output torques from 17 Nm to 2,371 Nm at 1500 r/min input, covering the full spectrum of light-to-heavy industrial speed-reduction needs in one standardised family.
Sealed & Low-Maintenance
Double-lip NBR seals prevent leakage and contamination. Splash lubrication requires no external pump. After the 100-hour initial oil change, maintenance intervals extend to 2,500 operating hours — ideal for remote or difficult-to-access installations.
⚡ High Cantilever Load Capacity
Generously spaced output shaft bearings provide high radial and axial load capacity, allowing direct sprocket, pulley, or coupling mounting without an external bearing plummer block — reducing cost and footprint.
Industry Applications
The WPA single-speed worm gear reducer excels wherever foot-mounted, compact, high-torque speed reduction is required:
Belt Conveyor SystemsMining, quarrying and bulk material handling lines requiring continuous, reliable torque for uninterrupted production.
Industrial Mixers & AgitatorsChemical, food and paint mixing vessels requiring steady low-speed, high-torque drive for extended batch cycles.
Agricultural MachineryGrain augers, seed spreaders, irrigation pump drives and harvester auxiliary systems.
Water & Wastewater TreatmentSludge scrapers, clarifier drives and rotary screens leveraging the WPA’s self-locking capability at high reduction ratios.
Construction EquipmentConcrete mixers, block-making lines and building material conveyors benefiting from the rugged housing.
Textile & Printing MachineryFabric winding, roller drives and printing press feed mechanisms where smooth speed reduction prevents registration errors.
Quality Control & Certification
ISO 9001:2015 & CE
Every WPA reducer is manufactured under ISO 9001:2015 quality management. CE Declaration of Conformity issued per shipment — compliant with EU Machinery Directive 2006/42/EC and Australian market entry requirements.
Pre-Shipment Testing
Three-stage inspection: (1) Noise & vibration test at rated load (≤72 dB(A)); (2) Oil-seal leak test — 30-minute pressurised run; (3) Torque output verification against published specification data.
Material Traceability
Housing: FC25 cast iron (≥250 MPa tensile). Worm: 20CrMnTi (≥58 HRC surface). Wheel rim: ZCuSn10Pb1 tin-bronze. Full material mill certificates available on request.
Why Choose Ever-power
- ✅ 20+ years of specialised worm gearbox manufacturing experience
- ✅ Exported to 60+ countries including Australia, Germany, USA, Canada and the Middle East
- ✅ Full OEM/ODM capability — custom ratios, shaft configs and private labelling from MOQ 1 unit
- ✅ In-house CNC gear grinding, hobbing and CMM inspection to ±0.01 mm
- ✅ 5,000+ units finished stock across WP series for 7–15 working day standard delivery
- ✅ Dedicated export packaging — plywood crate with anti-rust coating for ocean shipments
⭐ Customer Reviews
“We installed six WPA-100 units (1/30 ratio) on our underground belt conveyor. After 14 months of continuous operation in dusty, humid mine conditions — zero failures, no oil leaks. Extremely robust build quality; these gearboxes simply keep running.”
James H., Maintenance Manager
Mining Operation, Western Australia, Australia
“Wir haben WPA-135 Getriebe für unsere Zement-Fördertechnik bestellt. Die Qualität ist hervorragend — passgenaue Abmessungen, kein Ölverlust, sehr leiser Betrieb. Lieferzeit nach Deutschland war schneller als erwartet.”
Karl M., Procurement Engineer
Cement Plant, Bavaria, Germany
“We source WPA gearboxes for our grain handling equipment line. Dimensional consistency between batches is excellent — our assembly team can swap units without shimming. Competitive pricing with lead times that beat our domestic suppliers.”
Robert C., VP Engineering
Agricultural Equipment OEM, Iowa, USA
“Adquirimos WPA-80 para nossas linhas de mistura de tintas. A relação custo-benefício é excelente — ruído abaixo do especificado, aquecimento mínimo mesmo em operação contínua. Recomendamos com segurança.”
Fernanda L., Production Director
Paint Mixing Plant, São Paulo, Brazil
❓ Frequently Asked Questions
What reduction ratios are available for the WPA series?
Nine standard ratios: 1/5, 1/10, 1/15, 1/20, 1/25, 1/30, 1/40, 1/50, and 1/60. Custom ratios can be engineered for large OEM orders — contact our team to discuss feasibility.
How do I select the correct WPA frame size?
Calculate your required output torque (T = Load × Lever arm), apply service factor corrections for temperature (a₁) and duty cycle (a₂), then use P = T × n₂ ÷ (9550 × η) to find required input power. Cross-reference against the WP power and torque table. Our engineers offer free selection assistance.
What lubricant should I use in a WPA gearbox?
For ambient temperatures 15–60°C and worm shaft speeds 750–2000 r/min, ISO VG 320 mineral oil is standard. For higher temperatures (40–65°C), use ISO VG 460 or synthetic PG 460. Fill to the oil-sight glass centre mark. Change at 100 h first service, then every 2,500 hours.
Can the WPA be mounted vertically or at an angle?
The WPA is designed for horizontal foot-mount installation. The five shaft-direction options (A–E) refer to input/output shaft relative positions, not housing orientation. Vertical or inclined mounting is possible but requires adjusted oil-fill level — contact us for position-specific guidance.
Is the WPA gearbox self-locking?
At ratios of 1/30 and above, the worm lead angle typically falls below the friction angle, producing self-locking behaviour. This is not guaranteed under dynamic conditions or with synthetic lubricants. For safety-critical holding applications, always incorporate a dedicated mechanical brake as a redundant measure.
Ready to Order? Get a Fast Quote Today
Whether you need a single WPA unit for a retrofit or a container-load for a new production line, we are ready to help with competitive factory pricing, OEM capability, and rapid worldwide shipping.
