What is the common NMRV110 output bore?

A common NMRV110 hollow output bore is 42 mm. Confirm the keyway, tolerance and selected output arrangement before ordering.

What ratios are available for NMRV110?

Common ratios include 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80 and 100. Exact availability and rated performance must be confirmed for the selected motor and mounting configuration.

What motor powers can be matched with NMRV110?

The supplied configuration material illustrates motor powers from 1.1 to 7.5 kW. Not every power, ratio, input bore and flange can be combined; final selection depends on torque, duty and service factor.

How do I calculate NMRV110 output speed?

Divide the motor rated speed by the gearbox ratio. A 1400 rpm motor with a 50:1 ratio has a theoretical output speed of about 28 rpm.

NMRV110 Worm Gearbox | Dimensions, Ratios & Motor Selection

Published September 20, 2026 · SMK Transmission technical guide

Quick answer: NMRV110 is a medium-to-large aluminum right-angle worm reducer with a 110 mm center distance and a common 42 mm hollow output bore. Common ratios range from 7.5:1 to 100:1, while the supplied configuration material illustrates motor powers from 1.1 to 7.5 kW. Final torque, ratio, motor, flange, thermal capacity, service factor and mounting must be confirmed as one compatible assembly.

NMRV110 worm gearbox installation dimensions, 42 mm output bore and motor flange options

NMRV110 Worm Gearbox Overview

The NMRV110 worm gearbox is designed for industrial drives that need a compact 90-degree layout, substantial speed reduction and flexible motor connection. It can be configured with compatible three-phase AC motors, brake motors, servo motors or stepper motors when the adapter dimensions and duty are confirmed.

Specification	NMRV110
Model center distance	110 mm
Common hollow output bore	Ø42 mm
Common ratios	7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100
Housing	Aluminum alloy
Motor-power examples shown	1.1–7.5 kW
Motor connection	Compatible round IEC flange or confirmed custom square adapter

Compatibility limit: These values summarize the supplied NMRV110 configuration material. They do not mean that every motor power, ratio, input bore and flange can be freely combined. Obtain approved rated data and an installation drawing for the exact assembly.

NMRV110 Gear Ratios and Output Speed

Common ratios include 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80 and 100:1. Ratio selection begins with the motor rated speed and required machine speed.

Theoretical output speed = motor rated speed ÷ gearbox ratio

Example assumption: 1400 rpm rated motor and a 50:1 gearbox ratio.

1400 ÷ 50 = approximately 28 rpm

Actual loaded speed can differ because of motor slip, supply frequency, load and operating conditions. Ratio alone does not confirm output torque or thermal suitability. Use the ratio and torque calculator for an initial estimate and then verify the result against approved NMRV110 data.

NMRV110 Installation Dimensions

The supplied diagram illustrates preliminary envelope references of approximately 290 mm overall height, 252.5 mm housing length and 144 mm housing width. NMRV110 denotes a 110 mm model center distance. Input-side dimensions change with the selected motor and flange.

Before ordering or replacing an existing reducer, compare:

42 mm hollow output bore, keyway and tolerance
Input bore, pilot diameter and motor shaft
Flange outside dimensions and bolt pattern
Housing envelope and installation clearance
Mounting position, oil level and breather arrangement

Round IEC Motor-Flange Examples

Input bore	Illustrated motor-power examples	Illustrated flange outside diameters
24 mm	1.1 / 1.5 kW	Ø140 small / Ø200 large
28 mm	2.2 / 3 / 4 kW	Ø160 small / Ø250 large
38 mm	5.5 / 7.5 kW	Ø200 small / Ø300 large

These are illustrated combinations rather than universal interchangeability claims. Confirm the motor frame, voltage, frequency, rated speed, flange pilot, shaft diameter, bolt pattern and required duty. See the SMK electric motor page and motor-to-gearbox matching guide.

Servo and Stepper Motor Adapters

The supplied drawing also shows square-adapter examples. A 130 mm side length is illustrated with a 110 mm center hole, 145 mm diagonal bolt distance and 22 mm input bore; a 180 mm side length is shown with a 114.3 mm center hole, 200 mm diagonal bolt distance and 35 mm input bore. Custom adapters must be checked against the actual motor drawing.

How to Select the NMRV110 Motor

Do not select motor power from gearbox size alone. Confirm:

Required continuous and peak output torque
Motor rated power, speed, voltage and frequency
Ratio and expected output speed
Operating hours, starts per hour and reversing duty
Service factor and shock loading
Ambient temperature and thermal capacity
Mounting position and external radial or axial loads

The worm gearbox service-factor guide explains why duty can change the required reducer size.

Typical NMRV110 Applications

NMRV110 reducers are commonly considered for conveyors, packaging machinery, mixers, food-processing equipment, material handling and industrial automation. Conveyor projects should also confirm belt speed, drum diameter, conveyed load, incline and starts per hour; review the conveyor gearbox selection page.

Need NMRV110 Dimensions or Selection Help?

For a new drive or replacement, send:

Motor power, rated speed, voltage and frequency
Required output rpm or ratio
Required continuous and peak torque
Output bore, keyway and shaft dimensions
Input flange and bolt-pattern drawing
Mounting position and application details
Existing nameplate and installation photos, if replacing a unit

Conclusion

NMRV110 selection begins with the required speed and 42 mm output connection, then continues with torque, service factor, motor, flange, thermal and mounting verification. Use the supplied graphic for preliminary comparison and request an approved drawing before finalizing the machine interface.

NMRV110 Worm Gearbox