NMRV Worm Gear Reducer Selection Guide | Size, Ratio & Torque Chart
This quick guide covers all core parameters you need for NMRV worm reducer selection, helping you match the right model to your motor and load in 3 minutes.
1. Quick 3-Step Selection Process
1.Match Motor Power to Frame Size
Use the motor's rated power (kW or HP) to select the corresponding reducer frame size. For example, 0.75kW motor typically matches NMRV050, while a 3kW motor requires NMRV090 or larger.
2.Calculate the Required Ratio
The gear ratio equals the motor input speed divided by your target output speed. For a standard 4-pole motor (1400rpm), refer to the standard ratio table below.
3.Check the Allowable Torque
Ensure your equipment's maximum load torque does not exceed the reducer's rated allowable torque. For 24-hour continuous operation or applications with impact loads, apply a 1.5 service factor.
2.Key dimensions of NMRV reducer series (unit: mm)
| Frame Size | Center Height H | Output Shaft Dia. d | Input Flange | Net Weight (kg) |
| NMRV030 | 50 | 14 | 63B5 | 1.2 |
| NMRV040 | 60 | 18 | 71B5 | 2.2 |
| NMRV050 | 70 | 19 | 80B5 | 4.0 |
| NMRV063 | 80 | 25 | 90B5 | 6.0 |
| NMRV075 | 100 | 30 | 110B5 | 8.5 |
| NMRV090 | 112 | 35 | 130B5 | 14.0 |
| NMRV110 | 132 | 42 | 160B5 | 25.0 |
| NMRV130 | 140 | 45 | 180B5 | 38.0 |
| NMRV150 | 160 | 50 | 200B5 | 55.0 |
Note: For high-temperature, dusty, or high-impact load conditions, it is recommended to select the
next larger frame size to ensure reliable operation and extended service life.
Need a custom selection tool or a downloadable PDF datasheet for all NMRV models? Let us know
your specific application requirements.