The M3PHF60 gear unit combines a size 60 industrial housing with a hollow low-speed shaft, so the driven machine shaft passes straight through the output bore instead of meeting the unit through a coupling. Inside, the drive is the familiar three-stage all-helical train on parallel axes, with case-hardened and ground gearing in a horizontally split cast-iron housing that opens for inspection without disturbing the foundation.
Size 60 Housing, Hollow Output, No Coupling Needed
Stepping up from the smallest frames to size 60 puts the unit in the torque band where conveyors, rotary valves and mixers run continuously on two or three shifts. The hollow output changes the installation, not the gearing: the unit can be bolted to a bracket over the machine shaft, the bore takes a keyed fit or a shrink-disc connection, and alignment work on site shrinks because there is no output coupling to centre. Standard practice sizes the horizontal industrial range from 50 to 90, and the size 60 frame sits early in that ladder - compact, yet sized for sustained duty.
M3PHF60 Letter by Letter
| M3 | Industrial gear unit family, three helical stages |
| P | Parallel-shaft helical layout (R marks the bevel-helical right-angle build) |
| H | Hollow low-speed shaft, keyed or shrink-disc connection (S marks solid shaft) |
| F | Foot mounting (T marks torque-arm mounting) |
| 60 | Frame size 60 in the horizontal range 50 to 90 |
Because shaft type and mounting are independent letters, the same size 60 housing is also ordered as a solid-shaft foot build or as a hollow-shaft torque-arm build. One family, one dimension ladder, several installation styles - which is why plants tend to standardise on the series rather than buy drive by drive.
Continuous drives that spec this construction:
- Long-run trough screw and drag chain conveyors on hollow output shafts
- Rotary valves and airlock feeders in grain and flour handling
- Paddle and plough mixers driven without an intermediate coupling
- Bucket elevator boot and head shaft drives with a shrink-disc fit
- Filter press and sludge conveyor drives in water treatment works
- Travel and slewing drives on medium-duty portal cranes
Where the Hollow-Shaft Build Wins
Every time the machine shaft is already there and stiff, removing the coupling removes a cost, a maintenance item and a source of misalignment. Screw conveyors, rotary airlocks, paddle mixers and elevator shafts all meet that description. The foot-mounted hollow build keeps the unit supported on its own base, while the torque-arm variant lets the machine shaft carry the reaction - the choice depends on whether a foundation point is convenient at the drive location. WGT can discuss both arrangements against the outline drawing before the order is fixed.
Quotation and Documentation
The M-series catalogue and the size 60 outline drawing are supplied as PDF downloads, so the hollow-shaft bore, keyway or shrink-disc seat and the foot pattern can be checked against the machine shaft up front. Send the driven machine, the motor power and speed, the required output speed, the shaft diameter and the daily running hours; the selection is verified against those inputs, quoted in writing, factory-tested and packed in an export wooden crate under a one-year warranty.
Available Frames and Their Typical Duty
| Model | Centre distance | Output | Typical duty |
|---|
| M3PSF50 | size 50 | solid shaft, foot | conveyors, feeders |
| M3PSF60 | size 60 | solid shaft, foot | crushers, mixers |
| 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 |
Note that PSF and RSF frames of the same size share the mounting footprint; the R build simply inserts a bevel stage, so switching layout rarely forces a foundation change.
Questions and Answers
What payment terms do you accept?
We normally work on 30% deposit and 70% against the bill-of-lading copy for sea freight, or 100% before dispatch for small orders. Other terms can be discussed for framework or repeat business.
Can you manufacture a custom ratio or a special shaft?
Beyond the catalogue ratios we can quote special ratios and custom output shafts - splined, extended, special keyways or drilled - for OEM volumes. Tooling is amortised across the order, so unit cost falls as quantity rises.
Will the unit match my existing gearbox interface?
The series is manufactured to the standard centre distances, shaft dimensions and flange patterns of its frame family, so couplings, guards and foundations do not have to be redesigned. Send the nameplate details and we confirm the equivalent frame in writing.
Installation Examples
Stacker-reclaimer travel drive
A bulk terminal drives the travel gear of a stacker-reclaimer with units. Long-travel duty with frequent direction changes is smoothed by the ground gearing, and backlash stays within 20 arcmin over the full rail length.
Automatic parking system
A parking equipment manufacturer uses reducers on its puzzle-type car stackers. The hollow shaft takes the drive axle directly, and the quiet 60-68 dB operation suits installations inside residential buildings.
![gear box application map for industry]()
From quarries to food plants - one right-angle drive concept.
Selection Example: Screw conveyor intermediate drive
Take a 37 kW motor at 1470 rpm turning a trough screw conveyor at 28 rpm. The ratio follows directly: 1470 / 28 = 52.5, so a ratio near i=53 is selected. In this case the size 60 hollow output slides straight onto the conveyor drive shaft without a coupling. The ratio is the easy part. The service factor for the shock level is what makes the selection safe, and we check that for you at no charge.
![how to choose a speed reducer model]()
Ratio first, then torque, then frame size: the standard selection route.
Design Review, Datasheet and Price - Same Day
Planning a new machine? The WGT Motor & Gearbox Online Selection System covers motor power, ratio and mounting on one screen - enter your numbers and see the model immediately.
Send the interface drawing or the frame dimensions you need to match, and we return a 2D drawing and 3D STEP model with the quotation, so your design review is not held up waiting on the supplier. Looking for a gearbox for crusher? Tell us the duty point and we will confirm the model in writing.
