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NMRV Worm Gear Reducers

NMRV worm gear reducers in sizes NMRV30–NMRV90, supplied with matching OUBANG AC, brushed DC,BLDC and servo motors. Single-stage and double-stage configurations for low-speed, high-torque transmission, with lightweight aluminum alloy housings.

Choose from IEC B5 / B14 motor flange input or shaft input, with hollow shaft, single or double output shaft, optional F1 / F2 output flange and multiple mounting positions to match different equipment layouts.

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NMRV30-NMRV90

Single & Double Stage

Aluminum Alloy Housing

IEC B5 / B14 Motor Input

NMRV Worm Gear Reducer Series

NMRV worm gear reducers are available in round flange and square flange versions, with models from NMRV30 to NMRV90 and single-stage reduction ratios from 5:1 to 100:1. Double-stage NMRV+NMRV combinations are available on request.

NMRV Square Flange Worm Gear Reducer

Square flange input for square-frame motors from 57×57 to 130×130 mm, with a stable, compact layout.

Models: NMRV30–NMRV90
Reduction Ratio: 5:1–100:1
Housing: Aluminum Alloy

View Square Flange NMRV

NMRV Round Flange Worm Gear Reducer

Round flange input for IEC B5 / B14 motors in frames 56–112, for easy replacement and flexible installation.

Models: NMRV30–NMRV90
Reduction Ratio: 5:1–100:1
Housing: Aluminum Alloy

View Round Flange NMRV

Why Choose Our NMRV Worm Gear Reducers

Practical features for compact, reliable and flexible power transmission in industrial equipment.

Matched with Our Motors

Round and square flange options match OUBANG AC, DC, BLDC and servo motors, so no adapter is needed.

Low Backlash Option

A 10-1 tin bronze worm wheel allows backlash of ≤8 arcmin on both round and square flange versions.

Flexible Mounting Options

B3, B6, B7, B8, V5 and V6 mounting positions support different horizontal and vertical installation layouts.

Factory-Filled Lubrication

Lubrication is filled before shipment, so no additional oil filling is required before initial use.

NMRV Worm Gear Reducer Selection Guide

Compare center distance, output bore, weight, reduction ratio and motor flange options to quickly identify the right NMRV worm gear reducer model for your application.

Model	Center Distance (mm)	Output Bore / Keyway (mm)	Weight (kg)	Reduction Ratio	IEC Motor Frame	Square Flange (mm)
NMRV30	30	14 / 5	1.2	5:1–80:1	56, 63 (B5/B14)	57, 60, 80, 86, 90, 104
NMRV40	40	18 / 6	2.3	5:1–100:1	56 (B5), 63, 71	60, 80, 86, 90, 104
NMRV50	50	25 / 8	3.5	5:1–100:1	63 (B5), 71, 80	60, 80, 86, 90, 104, 110, 130
NMRV63	63	25 / 8	6.2	5:1–100:1	71, 80, 90	60, 80, 86, 110, 130
NMRV75	75	28 / 8	9	5:1–100:1	71 (B5), 80, 90, 100/112	80, 86, 110, 130
NMRV90	90	35 / 10	13	7.5:1–100:1	80, 90, 100/112	80, 110, 130

How to Read the NMRV Model Code

Each part of the NMRV model code identifies the reducer size, reduction ratio, motor flange, output option and mounting position

NMRV

Series

063

Size

Reduction Ratio

80B5

Motor Flange

AS1

Output Option

Mounting Position

Example Model

NMRV 050-20-80B5–FA2-B6

Size 050 · Ratio 20:1 · Motor flange 80B5 · Output flange FA2 · Mounting position B6

Output & Mounting Options

Output options: AS1 / AS2 single output shaft, AB double output shaft, F1 / F2 output flange.
Mounting positions: B3, B6, B7, B8, V5, V6.

NMRV Worm Gear Reducer Applications

NMRV worm gear reducers are widely used in compact transmission systems that require stable output, flexible mounting and reliable speed reduction. Typical applications include food processing, leather, textile, glass and ceramic, chemical and other light industrial machinery.

Food Processing Equipment

Suitable for compact conveying, mixing and auxiliary drive systems in food processing machinery.

Leather Machinery

Used in leather processing equipment that requires stable transmission and space-saving installation.

Textile Machinery

Ideal for winding, feeding and auxiliary motion systems in textile and fabric processing equipment.

Glass & Ceramic Machinery

A practical solution for compact drive systems in glass and ceramic production equipment.

Chemical Equipment

Suitable for light-duty chemical machinery that needs reliable reduction and flexible mounting options.

Light Industry Machinery

Widely used in general light industrial equipment, packaging lines and small automation systems.

NMRV Worm Gear Reducer FAQ

We offer NMRV30, NMRV40, NMRV50, NMRV63, NMRV75 and NMRV90 single-stage worm gear reducers. Double-stage NMRV+NMRV combinations are available on request.

Standard reduction ratios range from 7.5:1 to 100:1. A 5:1 ratio is available on request.

Yes. NMRV reducers are available with IEC B5 / B14 round flange and square flange inputs to match OUBANG AC, brushed DC, BLDC and servo motors. Share your motor model, flange size and rated speed, and we will confirm the suitable reducer size and reduction ratio.

No. NMRV30 to NMRV90 reducers are filled with synthetic lubricating oil before shipment, so no additional oil filling is required before initial use.

NMRV uses a hollow input bore with a motor flange for direct motor mounting, while NRV uses a shaft input for connection through a coupling, belt drive or other transmission method.

Explore Our Full Product Range

Explore our complete range of gear motors, gearboxes, drives and motion control products for industrial machinery, automation and replacement applications.

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Need Help Selecting the Right NMRV Worm Gear Reducer?

Share your motor model, required reduction ratio or output speed, flange size, output configuration and mounting position. Our engineers can help confirm the suitable NMRV model and configuration for your application.

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