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EP-NMRV025 Aluminium Worm Gearbox — Overview
The EP-NMRV025 is a compact precision aluminium worm gearbox representing the lightest and most compact unit in the NMRV series, engineered around a 025 mm worm gear centre distance. Developed to meet growing demand for lightweight, corrosion-resistant drive solutions across small conveyors, packaging feeders, medical devices, and laboratory automation, it combines precision-manufactured worm and wheel geometry with a robust die-cast aluminium A360 housing that delivers natural corrosion resistance without the bulk of traditional cast iron. The NMRV025 accepts IEC motor flanges (56B5, 63B5), enabling direct motor-to-gearbox coupling without adaptors — a significant advantage for machine builders seeking compact, efficient drive packages. With output torques up to 150 Nm and reduction ratios from 5–100:1, the EP-NMRV025 reliably serves precision positioning and light-duty automation across Australia and international markets. IP65 shaft sealing, six mounting positions, and a smooth baked-enamel finish make it equally at home in food processing washdown areas, outdoor plant rooms, and demanding industrial environments.
Technical Specifications — EP-NMRV025
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NMRV025 |
| Centre Distance | 25 mm |
| Max Output Torque | 150 Nm |
| Reduction Ratios | 5–100:1 |
| Input Bore Diameter | 9 / 11 mm |
| Output Shaft Diameter | 11 mm |
| Compatible IEC Flanges | 56B5, 63B5 |
| Max Recommended Input Power | 0.06 kW |
| Input Shaft Radial Load (Fri max) | 1350 N |
| Housing Material | Die-cast aluminium alloy A360 |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi case-hardened steel, ground |
| Surface Treatment | Baked enamel paint (RAL 5010 blue) |
| Lubricant | ISO VG 220 worm gear oil, ~0.06 L |
| IP Rating | IP65 (shaft seals standard) |
| Ambient Temperature | -10°C to +40°C standard; up to +60°C with synthetic oil |
| Max Input Speed | 1,400 rpm (recommended); 1,800 rpm (max) |
| Approx. Weight | ~1.2 kg |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Output Configurations | Solid shaft / Double shaft (DZ) / Output flange (FL) |
| Standards | ISO 9001, CE marking, IEC 60034 motor compatibility |
Performance Selection Data (1,400 rpm Input)
| Ratio (i) | Output Speed (r/min) | Output Torque (Nm) | Input Power (kW) |
|---|---|---|---|
| 5:1 | 280 | 150 | 0.06 |
| 10:1 | 140 | 200 | 0.06 |
| 20:1 | 70 | 250 | 0.06 |
| 30:1 | 47 | 280 | 0.06 |
| 50:1 | 28 | 300 | 0.06 |
Core Features & Benefits
◯Corrosion-Resistant Aluminium Housing
Die-cast A360 aluminium provides inherent corrosion resistance ideal for food processing washdown zones, coastal Australian sites, and humid industrial environments. The baked enamel finish adds UV protection for outdoor installations.
△IEC-Standard Motor Mounting (56B5, 63B5)
Hollow bore input with IEC-standard flange (56B5, 63B5) allows direct coupling to AC motors, servos, and stepper motors without separate adaptors, reducing installation time and eliminating alignment problems.
◆Superior Thermal Dissipation
Aluminium’s thermal conductivity (~160 W/m·K) dissipates heat up to 3× faster than cast iron, keeping operating temperatures lower and extending lubricant and seal life in enclosed machine cabinets.
■Six Mounting Positions + Three Output Options
B3, B6, B7, B8, V5, V6 mounting positions combined with solid shaft, double shaft (DZ), and output flange (FL) configurations give machine designers complete layout freedom.
▶Static Self-Locking at High Ratios
At ratios ≥ 40:1, worm geometry provides static self-locking, preventing back-drive under static load without an external brake — simplifying gate actuators, lift platforms, and positioning systems.
●Long Service Life: ≥20,000 Hours L10
Ground worm shafts, precision-hobbed phosphor bronze wheels, and preloaded bearings ensure consistent gear mesh throughout service life, delivering minimum L10 bearing life of 20,000 hours at rated load.
EP-NMRV025 vs Traditional Cast Iron Worm Gearbox
Australian and international machine builders consistently choose aluminium worm gearboxes for their combination of performance, durability, and total cost of ownership advantages over cast iron alternatives.
| Feature | EP-NMRV025 (Aluminium) | Traditional Cast Iron |
|---|---|---|
| Housing Material | Die-cast aluminium A360 | Grey cast iron GG25 |
| Approx. Weight | ~1.2 kg | 30–40% heavier |
| Corrosion Resistance | Excellent — inherent Al₂O₃ oxide layer | Requires coating; prone to rust |
| Thermal Conductivity | ~160 W/m·K — superior heat dissipation | ~50 W/m·K — poor heat dissipation |
| Surface Finish | Smooth baked enamel, easy to clean | Rough cast surface, hard to clean |
| Motor Mounting | Integrated IEC flange (no adaptor) | Often needs separate adaptor plate |
| Noise Level | Low — aluminium damps vibration | Higher — cast iron transmits vibration |
| Food Industry Suitability | High — smooth, corrosion-resistant | Low — porous surface, rust risk |
| IP Rating | IP65 shaft seals standard | IP54–55 typical |
| Price / Performance | Excellent — lower total cost of ownership | Higher initial & lifetime cost |
Application Sectors
The EP-NMRV025 is well suited to the following industries and application types, each benefiting from its compact size, corrosion-resistant housing, and reliable torque output.
⚘ Robotics & Automation
Suitable compact worm gearbox for robotic arms.
⚙ Packaging Machinery
Suitable lightweight worm reducer for packaging feeders.
⚚ Medical Devices
Suitable precision worm gearbox for laboratory automation.
⚒ Laboratory Equipment
Suitable aluminium worm reducer for medical devices.
⚛ Small Conveyors
Suitable small worm gearbox for conveyor indexers.
Selection Guide, Mounting Positions & Shaft Configurations
How to Select the Correct Ratio
- Calculate required output torque: M₂ = 9,550 × P (kW) / n₂ (rpm), then multiply by your service factor (fs = 1.0–2.5 depending on daily duty hours and load class).
- Find your ratio: Divide motor speed (typically 1,400 rpm) by required output speed. Select the closest ratio from: 5–100:1.
- Confirm torque capacity: The selected ratio’s rated torque must exceed M₂ × fs. If not, step up to the EP-NMRV030.
Mounting Positions
| Position | Description | Shaft Orientation | Oil Level Note |
|---|---|---|---|
| B3 | Horizontal foot mount | Horizontal | Standard fill level — default factory supply |
| B6 | Foot mount, output shaft down | Vertical downward | Reduce oil by ~15% |
| B7 | Foot mount, output shaft up | Vertical upward | Increase oil by ~15% |
| B8 | Foot mount, output shaft horizontal (180°) | Horizontal reversed | Standard fill level |
| V5 | Flange mount, shaft down | Vertical downward | Reduce oil — check lubrication guide |
| V6 | Flange mount, shaft up | Vertical upward | Increase oil — check lubrication guide |
Output Shaft Options
Standard output shaft diameter: 11 mm. Input bore: 9 / 11 mm.
11 mm diameter with keyway. Default configuration. Model suffix: none.
Shaft exits both sides for bidirectional power take-off. Model suffix: DZ.
Flanged output for direct bolt-on connection, eliminating shaft coupling. Model suffix: FL.
Frequently Asked Questions — EP-NMRV025
▶ What is the maximum output torque of the EP-NMRV025?
The EP-NMRV025 delivers up to 150 Nm output torque at 1400 rpm input. Higher reduction ratios (50:1, 100:1) yield maximum torque, making this 25 mm centre-distance unit ideal for small conveyors, packaging feeders, and light automation where space is a constraint.
▶ Which IEC motor flanges fit the EP-NMRV025?
The EP-NMRV025 accepts IEC 56B5 and 63B5 flanges, compatible with single-phase and three-phase motors up to 0.06 kW. The hollow-bore input also accommodates servo and stepper motor shafts with a matching adaptor kit — please provide motor shaft diameter when ordering.
▶ What lubrication does the EP-NMRV025 require?
The EP-NMRV025 is factory-filled with synthetic grease. When re-lubrication is needed, use ISO VG 220 worm gear oil. The housing holds approximately 0.06 litres. Under normal conditions, oil change intervals are every 5,000 hours or 2 years, whichever occurs first.
▶ What mounting positions are supported?
Six standard positions are available: B3 (horizontal foot), B6, B7, B8 (foot variants), V5 and V6 (vertical). B3 is the default factory supply. Vertical positions V5 and V6 require oil level adjustment per the lubrication guide to prevent seal leakage.
▶ Is the EP-NMRV025 self-locking?
At ratios of 40:1 and above, the EP-NMRV025 exhibits static self-locking (η < 0.5), preventing back-drive under static load. Dynamic self-locking is not guaranteed — an external brake is recommended for safety-critical vertical-load or positioning applications.
▶ How does the EP-NMRV025 differ from larger NMRV sizes?
The NMRV025 is the smallest unit in the range with a 25 mm centre distance, 11 mm output shaft, and up to 150 Nm torque. When torque requirements exceed this, the next step up is the EP-NMRV030 with a 14 mm output shaft and up to 200 Nm — still compact but with greater load capacity.
Customer Reviews
★★★★★
“We fitted the EP-NMRV025 on our small carton indexing conveyor. Incredibly compact and precise — after six months of three-shift operation they run as quietly as day one. The IEC flange saved hours of adaptor work.”
James Thornton — Automated Packaging Solutions
Australia
★★★★★
“Powers the dosing dispensers on our blister packaging line. Tight ratio accuracy is essential for our dose consistency requirements. Zero oil leaks after eight months of continuous use.”
Lena Fischer — Pharmaceutical Equipment GmbH
Germany
★★★★☆
“Installed four NMRV025 units on collaborative robot end effectors. The weight saving over cast iron equivalents improved our payload capacity noticeably. Smooth, quiet operation throughout.”
Carlos Mendoza — Robotics Integradora MX
Mexico
Related Products & Accessories
⚙ Compatible Motors
IEC B5/B14 flange single-phase (230V) and three-phase (380V) AC motors for frames: 56B5, 63B5.
Servo and stepper motors available with input adaptor kits. VFD-compatible motors for variable-speed applications.
⚒ Output Accessories
■ Single solid output shaft (standard)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV-E025 — coaxial inline output
■ EP-NRV025 — solid input shaft variant
■ EP-NRV-E025 — solid input, coaxial output
■ EP-NMRV030 — next frame size up
Ready to Order the EP-NMRV025?
Request a quote, technical selection support, or enquire about OEM and distributor partnership opportunities for Australian and international markets.
▼ Distributor & OEM partnerships welcome — volume pricing available
