What is an NMRV worm reducer?

An NMRV worm reducer is a compact worm gearbox with an aluminium die-cast housing (NMRV is the IEC standard designation). The lightweight construction, efficient heat dissipation, and universal mounting options — foot, flange, torque arm, or shaft-mount — make NMRV reducers ideal for space-constrained applications. Anand Gears NMRV reducers are available in sizes 025 through 150 with hollow or solid output shafts.

What is the difference between an NMRV worm reducer and a cast iron worm gearbox?

A cast iron worm gearbox is designed for heavy-duty applications requiring up to 25 kW power and 4200 Nm torque. NMRV worm reducers use lightweight aluminium die-cast housings, come in sizes 025 to 150, are universally mountable, and suit applications needing up to 18.5 kW power and 1550 Nm torque. NMRV reducers are more compact and cost-effective for lighter-duty applications, and the aluminium housing offers weight savings and corrosion resistance for outdoor and food-industry use.

What sizes and ratios of NMRV reducers does Anand Gears offer?

Anand Gears manufactures NMRV worm reducers in ten sizes from NMRV 025 (25 mm centre distance, 0.06-0.12 kW) to NMRV 150 (150 mm centre distance, 1.1-18.5 kW). Single-stage ratios run from 5:1 to 100:1, and double-stage NMRV+NMRV combinations extend the range up to 3600:1. Output torque spans 2.6 Nm to 1550 Nm at 1400 rpm input with service factor 1.0.

NMRV Worm Reducers — Aluminium Worm Speed Reducers 025–150

Name: NMRV Worm Reducers
Brand: Anand Gears

Aluminium NMRV worm speed reducer by Anand Gears

Aluminium Die-Cast

Lightweight Worm Reducers with Universal Mounting

Anand Gears NMRV worm reducers pack worm-gear reliability into a compact, lightweight aluminium die-cast housing. Ten sizes from NMRV 025 to NMRV 150 cover power ratings up to 18.5 kW and output torque to 1550 Nm, with single-stage ratios from 5:1 to 100:1 — and double-stage NMRV+NMRV combinations reaching 3600:1. The universal housing mounts in any orientation via foot, flange, torque arm, or direct shaft-mount, and the oil-filled design runs maintenance-free. Powder-coated aluminium offers weight savings and corrosion resistance that suit outdoor and food-industry installations.

Ten sizes: NMRV 025 – NMRV 150 (25–150 mm centre distance)

Ratios 5:1 to 100:1; double-stage to 3600:1

Universal mounting: foot, flange, torque arm, shaft-mount

Hollow or solid output shafts

Case-hardened worm ground to class 6, tin bronze gear

IP55 protection standard (IP65 on request)

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Build Quality

NMRV Construction & Materials

Every NMRV reducer combines a precision-ground worm mesh with a sealed, powder-coated aluminium housing.

Housing

Aluminium alloy die-cast housing, powder coated for corrosion resistance. Light enough for direct machine mounting without heavy support brackets, with fins that dissipate heat efficiently.

Material Aluminium alloy die-cast

Finish Powder coated

Protection IP55 (IP65 on request)

Worm & Gear Set

Case-hardened 20CrMnTi worm shaft ground to accuracy class 6, meshing with a tin bronze ZCuSn10Pb1 worm gear for smooth, quiet running and long service life.

Worm 20CrMnTi, case-hardened, ground class 6

Gear Tin bronze ZCuSn10Pb1

Lubrication Oil-filled, maintenance-free

Mounting & Output

One universal housing covers every orientation — foot, flange, torque arm, or shaft-mount — with hollow output bores from 20 mm to 50 mm or solid output shafts from 11 mm to 50 mm.

Mounting Foot / flange / torque arm / shaft

Output Hollow or solid shaft

Combinations Double-stage NMRV+NMRV to 3600:1

Engineering Data

NMRV Technical Specifications

Performance parameters for all ten NMRV sizes. Torque values at 1400 rpm input, service factor 1.0.

Model	Centre Distance (mm)	Power (kW)	Ratio Range	Output Torque (Nm)	Output Shaft (mm)	Hollow Bore (mm)	Weight (kg)
NMRV 025	25	0.06 – 0.12	5 – 100	2.6 – 11	11	—	0.7
NMRV 030	30	0.06 – 0.18	5 – 100	4 – 17	14	—	1.0
NMRV 040	40	0.09 – 0.37	5 – 100	10 – 45	18	—	2.3
NMRV 050	50	0.12 – 0.75	5 – 100	18 – 84	25	20	3.5
NMRV 063	63	0.18 – 1.5	5 – 100	32 – 160	25	25	6.2
NMRV 075	75	0.25 – 3.0	5 – 100	60 – 300	28	28	9.0
NMRV 090	90	0.37 – 4.0	5 – 80	100 – 480	35	35	13
NMRV 110	110	0.55 – 7.5	5 – 80	180 – 820	42	42	21
NMRV 130	130	0.75 – 11	5 – 80	260 – 1,100	45	45	32
NMRV 150	150	1.1 – 18.5	5 – 60	380 – 1,550	50	50	48

Extended Ratios with Double-Stage Combinations

Where a single NMRV stage cannot reach the required output speed, two units combine as an NMRV+NMRV double-stage set for total ratios up to 3600:1 — ideal for slow-turning agitators, dosing systems, and indexing drives. Torque values in the table apply at 1440 rpm nominal / 1400 rpm input with service factor 1.0; contact our engineering team for selection at other speeds and duty cycles.

Industry Solutions

NMRV Reducer Applications

Compact, universally mountable drives for light and medium-duty machinery across industries.

Packaging & Automation

Film advance drives, indexing conveyors, labellers, and case packers. The compact NMRV footprint fits inside machine frames, and the universal mounting simplifies drive layout on multi-axis packaging lines.

Conveyor Drives

Belt and roller conveyors in light and medium duty. Hollow-bore shaft mounting lets the reducer hang directly on the drive shaft with a torque arm — no couplings, no base plate, minimal installation time.

Food & Beverage Machinery

Fillers, mixers, and process equipment where the powder-coated aluminium housing resists corrosion in humid washdown-adjacent environments and keeps drive weight low on stainless frames.

Agitators & Dosing

Slow-speed stirrers, chemical dosing systems, and small mixers. Double-stage NMRV+NMRV combinations deliver very high ratios for precise, slow output speeds from standard 1440 rpm motors.

Material Handling

Turntables, small hoists, and gate drives. Self-locking worm behaviour at higher ratios holds position when power is removed, and the sealed IP55 housing shrugs off dust in warehouse environments.

OEM Machine Building

Textile machines, printing equipment, and special-purpose machinery. Standard IEC motor input flanges and ten interchangeable sizes make the NMRV series a drop-in drive module for OEM designs.

Complete the Drive Chain

An NMRV reducer rarely works alone. We supply the motor, the VFD, and the starter or control panel — sized together with the reducer so nothing is over- or under-specified.

VFD Drives → Control Panels & Starters → All Automation →

NMRV Worm Reducers