NU Series Worm Gearboxes
One universal single-piece casing that installs Under Driven or Over Driven — centre distances 60 to 205 mm, ratios 5:1 to 70:1, power to 22 kW.
Universal Casing
One Casing, Under Driven or Over Driven
The NU series is the workhorse of the Anand Gears worm range. A single-piece universal casing lets the same gearbox be installed Under Driven or Over Driven — the input position changes, the casing does not. That means one spare on your shelf covers both mounting arrangements, and a machine can be re-arranged on site without a new gearbox. Centre distances run 60 mm to 205 mm, ratios 5:1 to 70:1, and power to 22 kW, on a phosphor bronze worm wheel running against a case-hardened alloy steel worm.
Engineering Data
NU Centre Distances and Ratios
The NU sizes Anand Gears builds as standard. Power and torque at your exact duty point are confirmed at the budgetary-offer stage — send the power, input speed, and required output speed.
| NU Size | Centre Distance (mm) | Ratio Range | Typical Duty |
|---|---|---|---|
| NU 60 | 60 | 5:1 – 70:1 | Light conveyors, dosing and packaging drives |
| NU 72 | 72 | 5:1 – 70:1 | Conveyors, small mixers, gate and barrier drives |
| NU 84 | 84 | 5:1 – 70:1 | Mixers, agitators, material handling |
| NU 100 | 100 | 5:1 – 70:1 | Agitators, tube mills, medium conveyors |
| NU 127 | 127 | 5:1 – 70:1 | Heavier agitators, winches, process drives |
| NU 152 | 152 | 5:1 – 70:1 | Heavy mixers, mill drives, lifting duty |
| NU 180 | 180 | 5:1 – 70:1 | Heavy process and plant drives |
| NU 205 | 205 | 5:1 – 70:1 | Largest NU frame, heavy continuous duty |
Ratios beyond 70:1
Where the output speed calls for more reduction than a single worm stage can give, two stages are combined as a double reduction set, taking the ratio far beyond what one stage can reach. The stage split is worked out per job — tell us the input speed and the output speed you need and we will set it.
Built To Order
NU Arrangements We Build Regularly
The NU casing is the starting point, not the limit. These are arrangements Anand Gears makes as repeat work, not one-off experiments.
Hollow Output Shaft
Machined output bore with keyway so the gearbox slides straight onto the driven shaft — no coupling, no separate bearing block. Torque arm mounting keeps the reaction off the machine shaft.
Double Input Shaft
Input shaft extended both sides for a second drive, a hand wheel, or a brake. Common on machines that need manual jogging during setting.
Double / Three-Way Output
Output taken from both sides of the casing to drive two elements from one gearbox at identical speed — used on twin-shaft mixers and paired conveyor drives.
Vertical Up or Down Output
Output axis turned vertical for stirrers and agitators, with the oil level and seal arrangement changed to suit the mounting.
Flanged Output
Large output flange in place of the plain shaft where the driven element bolts directly to the gearbox — sized to the customer's bolt pattern.
Hollow Input for a Flange Motor
IEC flange motor mounted straight onto the gearbox through a hollow input, removing the coupling and the alignment work that goes with it.
Where It Runs
NU Series Applications
Where Anand Gears NU gearboxes are working today.
Mixers and Agitators
Slow, high-torque stirring in chemical, food, and paint plants — usually vertical output with the ratio picked for the blade tip speed.
Tube and Pipe Mills
Roll drives on tube mills, where the self-locking worm mesh holds the set when the drive stops.
Conveyors and Material Handling
Belt, roller, and screw conveyors — the NU casing lets the drive be flipped between under and over driven when the layout changes.
Winches and Lifting
Slow lifting duty where the worm mesh gives holding torque without a separate brake for the static load.
Plant and Process Drives
General plant machinery where a compact right-angle reduction is needed and the shelf spare must cover several machines.
Machine Builders and OEMs
Repeat build quantities to a fixed drawing, with the mounting and shaft ends held to the OEM's own dimensions.
Replacing an imported unit
Send the nameplate — we will match the mounting
Most NU enquiries start with a failed imported or legacy gearbox. Send a photo of the nameplate and the mounting, or the old unit itself, and Anand Gears will match the centre distance, ratio, shaft ends, and foot pattern so the replacement drops into the existing foundation. We have been building to other makers' mounting dimensions since 1996, and we cut the gears ourselves — so a worn wheel or worm can be replaced without buying a whole gearbox.
Budgetary offer — NU Series Worm Gearboxes
Tell us the duty and we’ll send you a number
Power, input speed, and either the ratio or the output speed you need are usually enough to start. Our engineers reply on the same working day.
Have a nameplate photo, a drawing, or the old unit in front of you? Send it on WhatsApp — that is the fastest route to a number.
Prefer to talk? +91 98203 83719 or +91 98205 18093.