UMSG75 100:1 Worm Gearbox - 28mm Hollow Output Bore, IEC 71/80/90/100/112 Input, Aluminium
The Universal Motors UMSG75 100:1 worm gearbox is a single-reduction aluminium-housed 75mm centre-distance worm/wheel reducer with a 28mm hollow output bore. This gearbox can be paired with a TEFC IEC squirrel-cage motor, available in your choice of power and input flange - either B14 or B5 motor mounting, in IEC frame sizes 71/80/90/100/112. Use the motor power dropdown to match your application's torque and speed requirements.
Technical specification
- Frame: UMSG75 (centre distance 75mm)
- Reduction ratio: 100:1
- Output bore: 28mm hollow, reducing bushes available
- Input mounting: IEC 71/80/90/100/112 (B14 or B5 flange)
- Motor options: 0.25kW, 0.37kW, 0.55kW
- Housing: aluminium, B3 foot-mounted
- Worm: hardened and ground steel; wheel: centrifugally cast bronze
- Lubrication: synthetic long-life, factory filled
- Gearbox weight: 14.0kg
- Maximum output torque: 180 Nm (ratio-dependent)
- Duty: S1 continuous
Applications
Typical uses include medium/heavy conveyors, industrial mixers, winches, stage machinery, material handling.
Cross-reference
Interchangeable with: NMRV075, RV075, Motovario NMRV075, Bonfiglioli VF72.
Warranty and delivery
24-month manufacturer warranty. UK stock with next-day delivery.
| Input power | 0.25 kW |
|---|---|
| Input flange | B5 |
| IEC frame | 71 |
| Input speed | 1400 rpm |
| Ratio | 100:1 |
| Output speed | 15 rpm |
| Output torque | 93.8 Nm |
| Nominal torque | 180.1 Nm |
| Max output torque | 206.3 Nm |
| Service factor | 1.92 |
| Efficiency | 60% |
| Centre distance | 75 mm |
| Output bore | 28 mm |
| Type | Worm Gearbox |
| Housing material | Aluminium |
| Series | UMSG75 |
| Brand | Universal Motors |
| Warranty | 12 months manufacturer |
| SKU | IMW-UMSG75-100.0-0.25kW-B5 |
| Input power | 0.37 kW |
|---|---|
| Input flange | B5 |
| IEC frame | 71 |
| Input speed | 1400 rpm |
| Ratio | 100:1 |
| Output speed | 15 rpm |
| Output torque | 138.8 Nm |
| Nominal torque | 180.1 Nm |
| Max output torque | 206.3 Nm |
| Service factor | 1.3 |
| Efficiency | 60% |
| Centre distance | 75 mm |
| Output bore | 28 mm |
| Type | Worm Gearbox |
| Housing material | Aluminium |
| Series | UMSG75 |
| Brand | Universal Motors |
| Warranty | 12 months manufacturer |
| SKU | IMW-UMSG75-100.0-0.37kW-B5 |
| Input power | 0.55 kW |
|---|---|
| Input flange | B14 |
| IEC frame | 80 |
| Input speed | 1400 rpm |
| Ratio | 100:1 |
| Output speed | 15 rpm |
| Output torque | 206.3 Nm |
| Nominal torque | 180.1 Nm |
| Max output torque | 206.3 Nm |
| Service factor | 0.87 |
| Efficiency | 60% |
| Centre distance | 75 mm |
| Output bore | 28 mm |
| Type | Worm Gearbox |
| Housing material | Aluminium |
| Series | UMSG75 |
| Brand | Universal Motors |
| Warranty | 12 months manufacturer |
| SKU | IMW-UMSG75-100.0-0.55kW-B14 |
| Input power | 0.55 kW |
|---|---|
| Input flange | B5 |
| IEC frame | 80 |
| Input speed | 1400 rpm |
| Ratio | 100:1 |
| Output speed | 15 rpm |
| Output torque | 206.3 Nm |
| Nominal torque | 180.1 Nm |
| Max output torque | 206.3 Nm |
| Service factor | 0.87 |
| Efficiency | 60% |
| Centre distance | 75 mm |
| Output bore | 28 mm |
| Type | Worm Gearbox |
| Housing material | Aluminium |
| Series | UMSG75 |
| Brand | Universal Motors |
| Warranty | 12 months manufacturer |
| SKU | IMW-UMSG75-100.0-0.55kW-B5 |
UK delivery
Next working day to most of the UK, on a fully tracked courier - you'll have the tracking link the moment it leaves our racking.
★ 2pm Promise: place your order before 2pm and it is despatched the same working day. Guaranteed, not just aimed for.
Shipping worldwide
We ship to 70+ countries with rates calculated live at checkout, so the price you see is the price you pay - no surprise invoice a week later. Moving several units, or need pallet freight? Get a freight quote on WhatsApp.
Returns
Specified the wrong one? Send it back within 14 days, unused and in its original packaging, and we'll refund it. Built-to-order and modified items are the one exception. Read the full returns policy →
Availability
6 × 0.25kW / B5 Flange on the shelf in our UK warehouse, boxed and ready to go out today.
5 × 0.37kW / B5 Flange on the shelf in our UK warehouse, boxed and ready to go out today.
3 × 0.55kW / B14 Face on the shelf in our UK warehouse, boxed and ready to go out today.
5 × 0.55kW / B5 Flange on the shelf in our UK warehouse, boxed and ready to go out today.
Which mounting do I need?
The mounting type describes how the motor is fixed in place and how the shaft connects to your equipment. Choosing the right one ensures a direct, drop-in fit.
- B3 (Foot) - bolts down through feet on the base. The most common general-purpose mounting.
- B5 (Flange) - a large machined flange with clearance holes bolts directly to your gearbox or machine face.
- B14 (Face) - a smaller spigot/face flange with tapped holes, for lighter direct-coupled loads.
- B35 / B34 - combination mountings that provide both feet and a flange for extra support.
Still not sure? Message an engineer with your machine or existing motor's frame and we'll confirm the exact mounting for you.
Send us a message
Ask our UK engineers about this motor - sizing, stock, or a custom quote. Required fields are marked with *.