Ever-power — Product Range

NMRV & NRV Worm Gearbox Series

Factory direct aluminium and cast-iron worm gear reducers. Speed ratios 5:1 to 100:1, centre distances 25 mm to 150 mm, four input-output configurations to suit any drive layout.

CE Certified ISO 9001 RoHS Compliant IEC Motor Compatible
⚙ NMRV ⚙ NRV ⚙ NMRV-E ⚙ NRV-E ✉ Get a Quote

Complete Worm Gear Reducer Range — Four Configurations

Ever-power manufactures the full NMRV and NRV worm gearbox family in a single facility, giving you consistent dimensional accuracy and interchangeable components across every frame size. All units conform to IEC motor mounting standards and are supplied with synthetic lubricant pre-filled, ready for immediate installation.

The four series — NMRV, NRV, NMRV-E, and NRV-E — share identical housing geometry but differ in how the input shaft is connected and whether a worm-direction tail output is fitted. This modularity lets engineers standardise on a single reducer family across multiple machine designs. For help selecting the right configuration, visit our application guides or contact our technical team.

NMRV worm gearbox series overview — Ever-power
Ratios 5:1 to 100:1 Centre distance 25–150 mm Input power 0.06–15 kW IP54 standard Food-grade oil option 6 mounting orientations Servo / stepper compatible CE & ISO 9001 certified
NMRV standard series aluminium worm gearbox
Standard Series

NMRV — Bore Input with Input Flange

The NMRV series is the industry-standard right-angle worm gear reducer. Die-cast aluminium housing (NMRV025–090) and grey cast iron (NMRV110–150) with a hollow bore input shaft and IEC B14 / B5 motor flange. The most widely specified configuration for packaging lines, food processing conveyors, and general industrial automation. All sizes accept the full reduction ratio range and are available with food-grade lubricant, Viton oil seals, and reinforced output shaft options.

Centre distance 25–150 mm
Reduction ratio 5:1 to 100:1
Max output torque Up to 1,200 Nm
Input type Bore + IEC flange
Mounting B3 / B6 / B7 / B8 / V5 / V6
Aluminium / Cast Iron
Housing material
IP54
Ingress protection
60 dB max
Operating noise
Up to 85%
Transmission efficiency
NRV shaft-input worm gear speed reducer
Shaft Input Series

NRV — Shaft Input without Input Flange

The NRV series shares the NMRV housing but replaces the hollow bore and IEC flange with a solid input shaft arrangement. This configuration is preferred where the drive motor connects via a belt, chain, coupling, or gearhead rather than direct IEC flanging. Identical output dimensions to the NMRV make retrofitting straightforward. Available across the full centre-distance range with the same ratio and mounting options as the standard NMRV series.

Centre distance 25–150 mm
Reduction ratio 5:1 to 100:1
Max output torque Up to 1,200 Nm
Input type Solid shaft (no flange)
Mounting B3 / B6 / B7 / B8 / V5 / V6
Belt / Chain / Coupling
Typical input method
IP54
Ingress protection
Same as NMRV
Output dimensions
Direct retrofit
NMRV compatibility
NMRV-E aluminium worm reducer with tail output shaft
Bore Input + Tail Shaft

NMRV-E — Bore Input with Flange & Worm-Direction Tail Shaft

The NMRV-E extends the standard NMRV by adding a coaxial tail output shaft protruding in the worm-shaft direction. This allows the gearbox to simultaneously drive two separate loads from a single motor, or to integrate with a secondary encoder, brake, or auxiliary drive component. The IEC input flange is retained, and the primary output shaft geometry is unchanged. Ideal for tandem conveyor drives, dual-zone mixing systems, and applications requiring position feedback without an additional coupling.

Centre distance 30–150 mm
Reduction ratio 5:1 to 100:1
Outputs Primary + worm-direction tail
Input type Bore + IEC flange
Dual output
Drive capability
Bore + IEC flange
Input configuration
Encoder / brake ready
Tail shaft application
IP54
Ingress protection
NRV-E shaft-input worm reducer with tail output shaft
Shaft Input + Tail Shaft

NRV-E — Shaft Input without Flange & Worm-Direction Tail Shaft

The NRV-E combines the flange-free shaft input of the NRV with the additional tail output shaft of the E configuration. This is the most flexible configuration in the range, accommodating belt or chain input drives on one end while providing a primary right-angle output and a worm-direction tail output simultaneously. Used extensively in material handling systems, multi-zone drives, and installations where a conventional IEC motor flange is not practical due to space or alignment constraints.

Centre distance 30–150 mm
Reduction ratio 5:1 to 100:1
Outputs Primary + worm-direction tail
Input type Solid shaft (no flange)
Maximum flexibility
Installation versatility
Shaft (no flange)
Input configuration
Dual output
Drive capability
IP54
Ingress protection
Selection Guide

Not Sure Which Series to Choose?

Use the quick decision guide on the right to identify the correct configuration for your drive arrangement. If your application falls outside these categories, our engineering team can advise on custom configurations, special ratios, and non-standard mounting arrangements.

Talk to an Engineer →
Your requirement Recommended
Direct IEC motor mount, single output NMRV
Belt / chain / coupling input, single output NRV
IEC motor mount, dual output or encoder tail NMRV-E
Belt / chain input, dual output or encoder tail NRV-E

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