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EP-NMRV050 Worm Gearbox — Mid-Duty Torque for Mixer, Conveyor & Pump Drives
The EP-NMRV050 aluminum worm gearbox occupies the sweet spot of the NMRV series — it is the smallest model capable of driving mid-duty mixing agitators, screw conveyors, and centrifugal pump actuators reliably at continuous duty. Weighing 3.5 kg, it bridges the gap between the lighter NMRV040 and the substantially larger NMRV063, offering a 25 mm output shaft that matches the most common driven-shaft diameter in mid-duty industrial equipment across Australia, continental Europe, and Southeast Asia.
With output torques reaching 290 Nm at the 100:1 ratio and a maximum radial load of 4,280 N on the output shaft, the NMRV050 handles demanding applications that would overtax the NMRV040 without requiring the bulk and cost of the NMRV063. Its four output flange options (FA, FB, FC, FD) and dual metric/inch shaft availability make it a highly configurable worm gear reducer for OEM machinery builders targeting both Australian and export markets.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | EP-NMRV050 |
| Weight (without motor) | 3.5 kg |
| Gear Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Max Input Power (P1) | Up to 0.75 kW |
| Max Output Torque (M2) | Up to 290 Nm |
| Output Speed Range | 14 – 280 rpm (at 1400 rpm input) |
| Max Radial Load Fr2 | Up to 4,280 N |
| Housing Material | Die-cast aluminum alloy |
| Worm Wheel Material | Phosphor bronze |
| Output Shaft Dia. (Metric) | 25 mm H8 (24 mm on request) |
| Output Shaft Dia. (Inch) | 1.000 in (-0.0005) |
| Keyway (metric output) | 8 x 28.3 mm |
| Input Shaft Dia. (Metric) | 14 j6 mm |
| Input Bore Dia. (Inch) | 0.6250 in |
| NEMA Input Flange | 56C |
| Output Flange Options | FA, FB, FC, FD |
| Mounting Options | Foot (NMRV), Shaft (NRV), Flange |
| Protection Class | IP54 standard |
| Operating Temperature | -10 to +40 deg C |
Dimensional Data — Metric & Inch
| Dimension | Metric (mm) | Inch (in) |
|---|---|---|
| Centre Height (A) | 92 | 3.62 |
| Centre Distance (I) | 50 | — |
| Output Shaft dia. | 25 mm H8 | 1.000 in |
| Input Shaft dia. | 14 j6 mm | 0.625 in |
| Keyway (output) | 8 x 28.3 mm | 0.25 x 1.5 in |
| Output Shaft Length | 50 mm | — |
| Flange Mount BK | 70 mm | 2.756 in |
Output Flange Options
| Flange | AA (mm) | AB (mm) | AC (mm) | AK Pilot dia. |
|---|---|---|---|---|
| FA | 85 | 90 | 125 | 70 mm +0.046 |
| FB | 85 | 120 | 125 | 70 mm +0.046 |
| FC | 130 | 89 | 160 | 110 mm +0.054 |
| FD | 115 | 72 | 140 | 90 mm +0.054 |
Core Features & Engineering Advantages
⚙ 25 mm Output Shaft — Industry Standard Fit
The 25 mm H8 output shaft diameter is the most common driven-shaft size in mid-duty industrial equipment worldwide. This eliminates the need for bushings or reducers when connecting to standard pump impellers, agitator hubs, and sprocket bores — saving engineering time and cost on Australian OEM builds.
🔥 High Torque Density at Low Weight
At 290 Nm peak from a 3.5 kg housing, the NMRV050 delivers approximately 83 Nm/kg — among the highest specific torque outputs available in the aluminum worm gearbox category. This lets designers consolidate two-stage mechanical systems into a single compact unit.
🌞 Chemical-Resistant Powder Coat
Electrostatic polyester powder coat resists mild acids, alkalis, and cleaning agents common in food-grade and water-treatment environments — a critical requirement for Australian water authority and food safety compliance.
💧 Four-Orientation Oil Fill
Multiple oil-fill and drain port positions allow correct lubrication in any mounting orientation — horizontal, vertical input-up, vertical input-down, or wall-mount — without custom oil reservoirs. Essential for mixer and agitator installations where mounting angle changes at commissioning.
📈 Broad Motor Compatibility
NEMA 56C input (inch) and IEC 80/90 frame B14/B5 adaptors (metric) accept motors from 0.18 kW to 0.75 kW, including inverter-duty VFD motors — making the NMRV050 compatible with virtually all process-industry motor standards used in Australian chemical and water plants.
Application Scenarios & Industry Suitability
🏭
Food Processing
Mixer agitator drives, dough kneader heads, filling auger conveyors — the corrosion-resistant aluminum worm gearbox withstands frequent washdown in food-grade environments.
💧
Water & Wastewater
Slow-speed sludge thickener rakes, chemical dosing pump actuators, and UV-lamp carriage drives in Australian water authority treatment plants.
⚙
Chemical Processing
Reactor agitator drives, valve actuators, and chemical transfer screw conveyors — sealed housing and chemical-resistant finish suit aggressive process environments.
📦
Packaging Automation
Screw capper drives, rotary table indexers, and case-packing conveyor zones — the 25 mm shaft connects directly to standard rotary actuator couplings.
Selection Guide & Shaft Configuration
- Ratio 5–15: High-speed agitators and pump drives — 93–280 rpm output.
- Ratio 20–50: Mixer drives, conveyor zones, filling heads — 28–70 rpm output.
- Ratio 60–100: Valve actuators, dosing metering, slow positioning — 14–23 rpm, maximum torque.
Shaft & Flange Configuration
Standard output: 25 mm H8 solid shaft with 8×28.3 mm keyway and M8 threaded end. Hollow bore (25 mm) option suits direct shaft coupling without separate coupling elements. Inch variant: 1.000 in output shaft with 0.25×1.5 in keyway. Four output flange options (FA–FD) cover pilot diameters 70–110 mm.
Aluminum vs. Cast Iron Worm Gearbox — NMRV050 Comparison
| Criterion | EP-NMRV050 (Aluminum) | Cast Iron Equivalent |
|---|---|---|
| Unit Weight | 3.5 kg ✅ | 12–18 kg |
| Output Torque (peak) | 290 Nm ✅ | Similar, heavier unit |
| Corrosion Resistance | High (powder coat) ✅ | Low without coating |
| Heat Dissipation | Excellent ✅ | Poor |
| Motor Standard | NEMA 56C + IEC ✅ | Usually one standard |
| Mounting Flexibility | Any orientation ✅ | Restricted |
Frequently Asked Questions
❓ What is the maximum output torque of the EP-NMRV050?
Up to 290 Nm at 100:1 ratio with 0.75 kW motor input. Ideal for continuous-duty mixer agitators and screw conveyors requiring more than 130 Nm.
❓ Is the NMRV050 suitable for food processing environments?
Yes — chemical-resistant powder coat withstands mild cleaning agents and hose-down. For direct food-contact zones, specify NSF H1 food-grade lubricant and IP65 sealing upgrade.
❓ What is the difference between the NMRV050 and NMRV063?
NMRV050: 290 Nm, 3.5 kg, 25 mm shaft. NMRV063: ~500 Nm, 6.2 kg, up to 28 mm shaft with higher radial load. Select NMRV063 for drives above 300 Nm.
❓ Can the EP-NMRV050 be used with a VFD at variable speeds?
Yes — fully VFD compatible. At output speeds below 20 rpm, verify motor thermal performance and consider external cooling for continuous duty above 50% rated load.
❓ What output shaft options are available for the NMRV050?
25 mm solid shaft with 8×28.3 mm keyway, hollow bore, four output flanges (FA–FD, pilot 70–110 mm), or 1.000 in inch shaft for imperial-system applications.
Customer Reviews
★★★★★
“Running EP-NMRV050 units on mixer agitator drives at our food processing plant in Brisbane. The 25 mm shaft fits our standard agitator hubs directly — no bushing needed. Seventeen months in, zero maintenance issues.”
David Nguyen 🇦🇺 — Production Manager, Food Processing Co., Australia
★★★★★
“Specified NMRV050 gearboxes for chemical dosing pump actuators at our water treatment facility in Hamburg. Corrosion-resistant housing and sealed shaft outputs have held up perfectly in our chemical environment.”
Erika Hoffmann 🇩🇪 — Process Engineer, Water Authority GmbH, Germany
★★★★½
“Used on screw conveyor drives in our packaging line. Good torque output for a compact aluminum unit, and VFD compatibility gave us the variable speed control we needed without additional components.”
Amir Hosseini 🇮🇷 — Plant Manager, Packaging Industries, Iran
Compatible Accessories & Related Products
🔌
IEC B5/B14 Motor Adaptors
IEC 80–90 frame adaptors for single-phase, three-phase, and VFD-compatible inverter-duty motors up to 0.75 kW.
🔨
NRV050 Torque Arm
K1=100 mm torque arm for shaft-mount NRV050 — prevents housing rotation on drum and agitator drives without a rigid base.
🔃
Output Flanges (FA/FB/FC/FD)
Pilot diameters 70–110 mm. Specify at order for direct bolted coupling with pump, mixer, and conveyor driven flanges.
🔒
Protective Input Cover
Polypropylene cover for the motor/input side — recommended for outdoor and washdown environments.
Get Your EP-NMRV050 Quote Now
Competitive pricing for single units and full production volumes. Technical team available for ratio selection, motor pairing, and application engineering support.
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About Ever Power
✉ [email protected] | OEM & distributor enquiries welcome
