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NMRV Round Flange Worm Gearbox 030–090
The NMRV round flange worm gear reducer is designed for direct connection with IEC B5 / B14 motors. Available in sizes NMRV30, NMRV40, NMRV50, NMRV63, NMRV75 and NMRV90, it provides a compact right-angle transmission solution for industrial machinery, automation equipment and replacement applications.
Round Flange Worm Gear Reducer Overview
The NMRV round flange worm gear reducer features a compact aluminum alloy housing and right-angle transmission design for industrial machinery. It is designed for use with three-phase induction motors, offering multiple output configurations and mounting positions to suit different installation requirements.
Available output options include hollow shaft, single or double output shaft, output flange and torque arm configurations. Tin bronze (CuSn10Pb1) and aluminum bronze worm wheels are available for different operating requirements. Selected tin bronze configurations can achieve backlash of ≤8 arcmin.
NMRV Worm Wheel Materials
Two worm wheel material options are available to suit different duty cycles, precision requirements and project budgets.
Premium Choice
Tin Bronze Worm Wheel
Material: CuSn10Pb1 (10-1)
Standard Choice
Aluminum Bronze Worm Wheel
Material: CuAl10Fe3 (9-4)
Which one to choose? Choose tin bronze for continuous duty, high loads or low-backlash requirements. Aluminum bronze is suitable for general-duty and intermittent applications where cost is a priority.
Worm Shaft: 20CrMnTi carburized steel, surface hardness 58–62 HRC, ground for precise meshing and stable operation.
Round Flange Gearbox Size & Dimensions
Main dimensions and bore sizes for NMRV round flange worm gear reducer models NMRV30, NMRV40, NMRV50, NMRV63, NMRV75 and NMRV90, including center distance, input bore, output bore, overall dimensions and weight. Use the diagram to identify the input bore, output bore and main gearbox dimensions.
Standard reduction ratios: 7.5:1, 10:1, 15:1, 20:1, 25:1, 30:1, 40:1, 50:1, 60:1, 80:1 and 100:1. 5:1 available on request.
|
Model |
Center Distance (mm) |
Output Bore (mm) |
Input Bore (mm) |
Length (mm) |
Height (mm) |
Width (mm) |
Weight (kg) |
|
NMRV 030 |
30 |
14 |
9 / 11 |
80 |
97 |
56 |
1.2 |
|
NMRV 040 |
40 |
18 |
9 / 11 / 14 |
100 |
121 |
71 |
2.3 |
|
NMRV 050 |
50 |
25 |
11 / 14 / 19 |
120 |
144 |
85 |
3.5 |
|
NMRV 063 |
63 |
25 |
14 / 19 / 24 |
144 |
174 |
103 |
6.2 |
|
NMRV 075 |
75 |
28 |
19 / 24 / 28 |
172 |
205 |
112 |
9 |
|
NMRV 090 |
90 |
35 |
19 / 24 / 28 |
206 |
238 |
130 |
13 |
Note: Dimensions and weight are for reference only. Please request the confirmed drawing for final installation dimensions.
IEC Motor Compatibility & Flange Options
The NMRV round flange series is designed for direct connection with three-phase induction motors using suitable IEC B5 / B14 motor flanges and matching input bores.
Three-Phase Induction Motors
Compatible with IEC motor frames 56–112, depending on the NMRV gearbox size and flange configuration.
Available with IEC B5 / B14 round flange options for direct motor mounting.
Input bore and flange size should be selected according to the motor shaft and frame size.
Suitable for industrial machinery, conveyors, pumps, mixers and general transmission applications.
Compatible NMRV Sizes / Flange Options
Find your IEC motor frame below to identify compatible NMRV gearbox sizes. Motor shaft diameter, input bore and B5 / B14 flange dimensions must be checked before installation.
|
IEC Motor Frame |
Motor Shaft Ø (mm) |
Compatible NMRV Sizes |
|
56 |
9 |
NMRV030 (B5/B14), NMRV040 (B5) |
|
63 |
11 |
NMRV030 (B5/B14), NMRV040 (B5/B14), NMRV050 (B5) |
|
71 |
14 |
NMRV040, NMRV050, NMRV063 (B5/B14), NMRV075 (B5) |
|
80 |
19 |
NMRV050, NMRV063, NMRV075, NMRV090 (B5/B14) |
|
90 |
24 |
NMRV063, NMRV075, NMRV090 (B5/B14) |
|
100/112 |
28 |
NMRV075, NMRV090 (B5/B14) |
Note: Compatible configurations depend on the motor frame, B5 / B14 flange dimensions and input bore. Please share your motor model or nameplate for confirmation before ordering.
How to Select an NMRV Gearbox
Confirm the size, ratio, motor flange, input bore and output configuration before ordering.
Model / Size
Choose NMRV 030, 040, 050, 063, 075 or 090 according to the required torque, installation space and motor size.
Ratio
Output speed = motor speed ÷ reduction ratio. Select the required ratio from 7.5:1 to 100:1, depending on model. A 5:1 ratio is available on request
Motor Flange
Match the IEC B5 / B14 flange type and motor frame size to the selected NMRV gearbox.
Input Bore / Keyway
Confirm the motor shaft diameter and keyway size to match the gearbox input bore.
Output Configuration
Choose hollow shaft, single or double output shaft, output flange or torque arm according to the machine layout.
Replacing an existing gearbox? Share your current model, nameplate photo, mounting dimensions and application requirements. Our engineers can help confirm a matching replacement.
NMRV Gearbox Applications
NMRV worm gearboxes are suitable for compact industrial machinery requiring right-angle transmission, high reduction ratios and flexible mounting options.
Packaging Machinery
Compact right-angle transmission for feeding, sealing, indexing and packaging mechanisms.
Conveyors
Suitable for belt, roller and chain conveyors where compact installation is required.
Feeding and Dosing Equipment
High reduction ratios for compact feeders, hoppers and dosing mechanisms.
Automation Equipment
Right-angle transmission for transfer, indexing, positioning and assembly equipment.
Labeling and Filling Machines
Suitable for feeding, positioning and applicator drives in labeling and filling equipment.
OEM Machinery
Standardized mounting options for new machinery and replacement projects.
NMRV Worm Gearbox Frequently Asked Questions
Need a Custom NMRV Round Flange Worm Gearbox?
Share your required reduction ratio, IEC motor frame, flange type (B5 / B14), input bore, output configuration and application requirements. You can also share your motor nameplate or existing gearbox model, and our engineers will help confirm a suitable NMRV round flange gearbox.