The M3PSF60 heavy duty helical gearbox takes the size 50 frame's design and steps up the torque: a larger size 60 housing, bigger shafts and bearings, and the same three-stage helical layout on parallel axes. Plants upgrading an existing size 60 installation keep the same mounting philosophy, interface concepts and foot-mounted solid-shaft output - without redesigning foundations, couplings or guards.
One Step Up the M-Series Size Ladder
Within the M-series, moving from size 50 to size 60 raises the permissible continuous torque well into the range where feeds, mill drives and shredders sit. Because every stage is helical, the drive keeps its efficiency across the whole ratio band, and the horizontally split cast-iron housing lets maintenance crews inspect the gearing without pulling the gear unit off its foundation. The low-speed shaft is solid steel as standard, machined for a keyed coupling, with hollow-shaft builds available in the same size.
The M3PSF Family at a Glance
| M3PSF50 | Size 50, three-stage, foot mounted, solid shaft |
| M3PSF60 | Size 60, three-stage, foot mounted, solid shaft |
| M3PSF70 | Size 70, three-stage, foot mounted, solid shaft |
| M3PSF80 | Size 80, three-stage, foot mounted, solid shaft |
| M3PSF90 | Size 90, three-stage, foot mounted, solid shaft |
| M4PSF / M5PSF | Four- and five-stage builds of the same family for very high ratios |
The letters stay constant through the family; only the stage count and the size number change. Output variants carry their own letters - H for a hollow low-speed shaft, T for torque-arm mounting, V for vertical builds - so one ordering system covers the whole industrial range.
Typical heavy-duty applications:
- Shredders, granulators and heavy hammer mills
- Rotary kilns, coolers and dryers in cement and lime works
- Apron feeders under crushing and screening plants
- Mixers, agitators and reactors in heavy chemical service
- Dredger drives and mining slurry pump sets
- Sugar mill carriers, diffusers and bagasse conveyors
How to Get Drawings and a Quotation
Ask for the M-series catalogue and the size 60 outline drawing and WGT sends both as PDFs the same working day, together with a quotation once the duty point is known. The three inputs that fix the selection are motor power and speed, required output speed, and a description of the driven machine including shock load and daily running hours. Every unit is bench-tested before packing and leaves the plant with a test record and a one-year warranty.
The M3 Series at a Glance
| Model | Centre distance | Output | Typical duty |
|---|
| M3PSF60 | size 60 | solid shaft, foot | crushers, mixers |
| M3PSF50 | size 50 | solid shaft, foot | conveyors, feeders |
| M3PSF70 | size 70 | solid shaft, foot | ball mills, shredders |
| M3PSF80 | size 80 | solid shaft, foot | kilns, heavy conveyors |
| M3PSF90 | size 90 | solid shaft, foot | mill and kiln drives |
| M3RSF50 | size 50 | solid shaft, foot, right-angle | inclined conveyors, elevators |
| M3RSF60 | size 60 | solid shaft, foot, right-angle | screw classifiers, feeders |
| M3RHF70 | size 70 | hollow shaft, foot, right-angle | agitators, drum drives |
| M3PHT80 | size 80 | hollow shaft, torque arm, parallel | shaft-mounted conveyors |
| M3RHT90 | size 90 | hollow shaft, torque arm, right-angle | heavy shaft-mounted drives |
All frames in the table belong to one industrial family. P = helical parallel-shaft, R = bevel-helical right-angle; the low-speed shaft is solid (S) or hollow (H), mounted on feet (F) or a torque arm (T).
Selection Example: Shredder feed conveyor
Take a 75 kW motor at 1480 rpm driving a shredder feed conveyor at 21 rpm. The ratio follows directly: 1480 / 21 = 70.5, so i=71 with the service factor covered. In this case the size 60 industrial frame absorbs the shock loads of irregular scrap feed. That single division gives the catalogue ratio; the service factor for your duty class is then applied to the torque, and the frame size follows.
![how to size a industrial helical gearbox in four steps]()
Sizing flow: motor speed, target output speed, torque, service factor.
Where This Series Works in Practice
Automatic car-wash line
A car-wash equipment builder fits hollow-shaft reducers to its conveyor chains. The compact frame hides inside the wash tunnel, and FKM seal options handle the constant moisture.
Textile dyeing drums
A dyeing machine maker uses speed reducers on its fabric-turning drums. Low vibration (under 20 microns) prevents streaks in the fabric, and the 94-96% efficiency keeps the heat load down in a warm workshop.
Technical Questions, Answered
How do I calculate the ratio I need?
Divide motor speed by the target output speed (i = n1/n2), then check the required torque against the rating table with your service factor. The online selector below does this automatically.
Can the reducer be supplied with a brake motor or an IEC motor flange?
Yes. We supply the reducer as a bare unit with an IEC standard input flange, and you can bolt on any IEC or NEMA motor - including a brake motor. The flange dimensions follow the common IEC pattern, so existing motors drop straight on.
![industrial helical gear reducer application fields]()
Common application areas for right-angle industrial helical drives.
Size It, Quote It, Ship It
One minute, one model. Skip the back-and-forth: configure your drive in the WGT Motor & Gearbox Online Selection System and send us the result for a same-day quotation.
Give us the driven machine, the required output speed and the daily running hours, and we return a confirmed model number with torque margin and a firm price - no obligation, no charge for the selection work. Looking for a gear reducer for screw conveyor? Tell us the duty point and we will confirm the model in writing.
