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EP-NRV025 Worm Reducer — Ultra-Compact Shaft-Mount Worm Speed Reducer at 0.5 kg
The EP-NRV025 aluminum worm reducer is the smallest shaft-mount unit in Ever Power’s NRV series — delivering right-angle speed reduction in a housing that weighs just 0.5 kg. Unlike the NMRV025 foot-mount variant, the NRV025 has no input shaft: it mounts directly onto the driven machine shaft using a hollow bore, with a torque arm preventing housing rotation. This shaft-mount configuration eliminates the coupling, mounting bracket, and shaft alignment procedures required by conventional foot-mount reducers, reducing both installation time and total drive footprint.
For compact automation equipment, light conveyor systems, and OEM machinery where installation space is severely constrained, the NRV025 provides the lowest possible profile of any right-angle worm reducer in its torque class. At ratios from 5:1 to 60:1, output speeds from 23 to 280 rpm (at 1400 rpm motor input) cover the full range required for labelling machines, small packaging conveyors, light agitators, and precision positioning drives in Australian industrial and food processing facilities.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | EP-NRV025 |
| Weight (without motor) | 0.5 kg |
| Gear Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60 |
| Max Output Torque (M2) | Up to 15 Nm |
| Output Speed Range | 23 – 280 rpm (at 1400 rpm input) |
| Output Shaft Dia. (Metric) | 11 mm H8 |
| Output Shaft Dia. (Inch) | 0.50 in (−0.0005) |
| Keyway (output) | 4 × 12.5 mm |
| Housing Material | Die-cast aluminum alloy |
| Worm Wheel Material | Phosphor bronze |
| Mounting Type | Shaft-mount (hollow bore) + torque arm |
| Input Options | IEC 56B, 63B flange / NEMA 48C |
| Protection Class | IP54 standard |
| Operating Temperature | -10 to +40 deg C |
Dimensional Data — Metric & Inch
| Dimension | Metric (mm) | Inch (in) |
|---|---|---|
| Output Shaft dia. | 11 mm H8 | 0.50 in |
| Keyway (output) | 4 × 12.5 mm | 0.187 × 0.75 in |
| Output Shaft Length | 20 mm | — |
| Torque Arm K1 | 80 mm | 3.15 in |
| Housing Width | approx. 60 mm | 2.36 in |
NRV vs. NMRV — Why Choose Shaft-Mount?
| Criterion | EP-NRV025 (NRV) | NMRV Foot-Mount |
|---|---|---|
| Mounting Method | Hollow bore on driven shaft ✅ | Foot bracket + shaft coupling |
| Coupling Required | None ✅ | Yes (jaw, oldham, or rigid) |
| Alignment Procedure | None ✅ | Required at installation |
| Installation Footprint | Minimum ✅ | Larger (bracket + coupling) |
| Installation Height | Lowest possible ✅ | Higher |
| Maintenance Access | Simpler ✅ | Coupling inspection needed |
Core Features & Engineering Advantages
⚙ No Input Shaft — True Shaft-Mount
The NRV025 has no input shaft. Motor connects directly via IEC 56B/63B or NEMA 48C input flange, eliminating the shaft coupling and alignment procedure required by foot-mount reducers. Ideal for compact OEM machinery with minimal installation clearance.
🔥 0.5 kg — Lightest in NRV Series
At just 0.5 kg, the NRV025 is the lightest worm reducer in the NRV range. For high-volume OEM machinery manufacturers, this weight contributes directly to machine weight compliance targets and shipping cost reduction.
📈 11 mm Output Shaft — Small Conveyor Standard
The 11 mm H8 output shaft matches the bore of small conveyor rollers, labelling drum shafts, and light agitator impeller hubs common in compact packaging and food processing machinery across Australian OEM markets.
📝 Torque Arm Anti-Rotation
The K1=80 mm torque arm connects to a fixed machine frame point, preventing housing rotation under load. Pre-drilled torque arm fixing holes align with standard extrusion T-slot profiles and welded machine frame tabs without custom fabrication.
🌞 Ratios 5–60:1 in One Housing
Ten ratio options (5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60:1) in the same physical housing give OEM designers maximum flexibility for speed matching across a product line without housing or bracket changes.
Application Scenarios & Industry Suitability
🏭
Packaging & Labelling Machinery
Label applicator drum drives, carton conveyor belt tensioners, and small shrink-wrap tunnel drives — the NRV025 zero-footprint shaft-mount eliminates bracket welding and coupling alignment in tight packaging machine frames.
⚙
Light Process Agitation
Small chemical blending unit agitators, pharmaceutical mixing drum drives, and laboratory reactor stirrers — 15 Nm output and 0.5 kg housing allow direct mounting on small vessel shaft stubs without frame reinforcement.
🏛
Food Processing Equipment
Small dough mixer auxiliary drives, tray conveyor drives, and condiment dosing pump drives — IP54 sealing and corrosion-resistant aluminum housing withstand regular washdown in food processing environments.
📈
Automation & Robotics Ancillaries
Conveyor indexing drives, small rotary table drives, and light-duty pick-and-place conveyor systems — compact shaft-mount eliminates the alignment issues that cause early bearing failure in high-cycle automation machinery.
Selection Guide — NRV025 Ratio Selection
- Ratio 5–10: Higher output speed — 140–280 rpm, for fast label applicators and conveyor belt drives.
- Ratio 15–30: Medium speed — 47–93 rpm, for most light process and packaging drives.
- Ratio 40–60: Low speed — 23–35 rpm, maximum 15 Nm torque for slow agitators and positioning drives.
Shaft & Torque Arm Configuration
Output: 11 mm H8 solid shaft with 4×12.5 mm keyway. Inch option: 0.50 in shaft. Hollow bore mounts directly onto driven shaft — specify driven shaft diameter at order. Torque arm K1=80 mm with M6 fixing hole. Input: IEC 56B, 63B flange, or NEMA 48C — specify at order.
Frequently Asked Questions
❓ What is the difference between the NRV025 and NMRV025?
The NMRV025 has a foot-mount base and an input shaft for motor coupling via a standard jaw or oldham coupling. The NRV025 has no input shaft and mounts directly onto the driven shaft using a hollow bore and torque arm — eliminating coupling, misalignment, and mounting bracket.
❓ How does the NRV025 mount onto the driven shaft?
The NRV025 hollow bore slides directly onto the driven shaft, secured by a keyway. A torque arm pin connects to a fixed anchor point on the machine frame to prevent housing rotation. No coupling or alignment procedure is required.
❓ What output torque does the NRV025 deliver?
Up to 15 Nm at 60:1 ratio — suited to small conveyor belt tensioners, light agitators, labelling machine drives, and compact packaging equipment.
❓ Can the NRV025 accept an IEC motor directly?
Yes — accepts IEC 56B and 63B input flanges for direct motor mounting, eliminating a separate motor adaptor for small three-phase or single-phase motors. NEMA 48C is also available.
❓ Is the NRV025 available in right-angle and inline configurations?
The standard NRV025 is a right-angle worm reducer (90-degree offset between input and output). Inline worm reducer configurations are not available in the NRV series.
Customer Reviews
★★★★★
“Using NRV025 shaft-mount reducers on our label applicator drives in our packaging line in Melbourne. Zero coupling alignment issues since switching from foot-mount. Very pleased with the result.”
Liam Thornton 🇦🇺 — Production Engineer, Packaging Machinery, Australia
★★★★★
“Specified NRV025 on small conveyor belt drives in our food packaging plant in Poznan. Shaft-mount eliminates the bracket welding we used to do. Clean installation, fits tight spaces easily.”
Tomasz Kowalski 🇵🇱 — Maintenance Engineer, Food Packaging Plant, Poland
★★★★½
“Used NRV025 on light agitator drives in our chemical blending unit. The compact size and low weight make it ideal for mounting directly on the mixer shaft. Dimensions exactly as specified.”
Liu Mingzhi 🇨🇳 — Process Engineer, Chemical Blending Co., China
Compatible Accessories & Related Products
🔌
IEC 56B/63B Motor Adaptors
Direct motor mounting flanges for 0.06–0.18 kW three-phase motors in 56 and 63 frame — no separate adaptor plate required.
🔨
Torque Arm (K1=80 mm)
Standard torque arm for NRV025 — M6 fixing hole, fits standard extrusion T-slot profiles and welded machine frame tabs.
🔃
Output Shaft Cover
Protective cover for the NRV025 output shaft stub end in environments requiring IP protection beyond the standard IP54.
⚙
NMRV025 Foot-Mount Variant
If foot-mount installation is preferred, the NMRV025 provides the same gear ratio and torque range with a standard base and input shaft.
Specify the EP-NRV025 for Your Compact Drive
Application support for ratio selection, shaft sizing, and torque arm configuration for Australian OEM machinery and packaging industry customers.
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