WHEEL HUB · BLAST WHEEL COMPONENTS
The part that isn't a wear part.
Blades, cages and liners are bought as consumables. The hub they all mount to usually isn't — which is why it outlives several sets and quietly decides how well each one runs.
A blast wheel hub carries the blades and locates them on the shaft. It does not throw abrasive and it does not aim it, so it rarely appears in a maintenance schedule. It still sets the balance the bearings live with.
Send us your wheel detailsWhere the wheel hub sits in the blast wheel assembly
Pull the wheel apart and the hub is what stays on the shaft. Everything that wears bolts to it.
WHERE IT SITS
Between the shaft and every blade.
Trace the drive from the motor and the hub is the last part before the abrasive gets moving. The shaft turns it, it turns the blades, and the blades do the work. Everything downstream of the hub inherits how accurately it was made and how well it is still holding its blades.
- 01
Drive shaft
Delivers torque from the motor. Runs in the bearings that carry the whole assembly.
- 02
Wheel hub
Clamps to the shaft and carries the blades at a fixed radius and spacing.
- 03
Blades
Bolt or slot into the hub. Accelerate abrasive from the centre outwards.
- 04
Control cage
Sits inside the blade circle and does not turn. Meters abrasive onto the blades.
The cage and the impeller sit inside the blade circle; the hub sits behind it. That is why a cage problem shows as a misplaced pattern and a hub problem shows as vibration.
WHAT IT IS CALLED
Same part, five names, five catalogues.
This is the most common reason a hub enquiry stalls. The component is catalogued under different names by different manufacturers, so a maintenance engineer reading one machine's manual and a supplier reading another's parts list are describing the same part and not realising it.
- Wheel hub
- Common in European machine documentation and general service writing.
- Runner head
- Standard in several North American wheel catalogues.
- Runnerhead hub
- Used where the head and hub are listed as one assembly.
- Hub assembly
- Usually a hub supplied together with its taper-lock bush.
- Bladed wheel
- Used when the hub is quoted complete with a blade set fitted.
If your manual calls it a runner head and your supplier calls it a hub, you are both right. Quote the machine make, the wheel size and the blade count and the naming stops mattering.
HOW IT MOUNTS
A taper-lock bush, not a bolt through the middle.
Blast wheel hubs are commonly secured to the shaft with a taper-lock bush. Tightening the screws draws the hub onto the taper, and the taper grips the shaft. The clamp is what transmits torque — there is no key doing the work on its own.
It is a press fit you create by tightening
The grip only exists once the screws are pulled up. A hub that has been refitted without being drawn up properly can look installed and still creep on the shaft under load.
Removal uses the same threads in reverse
Taper-lock bushes have jacking holes for exactly this. Levering or heating a hub off instead is how shafts and hub bores get damaged, and a damaged bore is what turns a hub replacement into a shaft replacement.
The bush is part of the order
Hubs are frequently catalogued with the bush as a matched assembly. Ordering the hub alone and reusing a bush that has already been drawn up is a common false economy.
Seals sit at this joint
Hub seals are listed as separate parts in most catalogues. If abrasive is reaching the bearing side, that seal is worth checking before anything larger is suspected.
Tightening torques, bush sizes and shaft fits are machine-specific. Work to the figures in your machine's manual, not to a general rule.
WHY IT MATTERS
The hub does not wear out. It lets everything else wear unevenly.
A blast wheel is a balanced rotating assembly. The blades are matched and fitted as a set precisely so the mass stays even around the centre. The hub is what holds that arrangement — so when the hub's blade seats are worn, opened up or unevenly loaded, the set no longer sits where it was balanced to sit.
- Vibration that returns shortly after a fresh blade set is fitted, when the blades themselves are not at fault.
- Blade seats that no longer hold blades at a consistent radius, so the set stops behaving as a matched set.
- Load carried into the bearings and shaft on every rotation instead of being cancelled out.
- Blade wear that reads as uneven when the underlying cause is where the blades are sitting, not what they are made of.
This is the practical reason to look at the hub at blade-change time: it is the one moment the seats are visible and empty, and the only moment checking them costs nothing.
WHAT TO LOOK AT
Five minutes, while the blades are out.
A hub check does not need instrumentation. It needs the blades out and someone who knows what a good seat looks like.
- Blade seats
- Wear, peening or opening up. Compare seats against each other, not against memory.
- Retaining features
- Pins, locks and retainers that are worn, distorted or no longer seating fully.
- Hub bore and taper
- Scoring, fretting or bright patches — signs the hub has been moving on the shaft.
- Mounting face
- Burrs and debris. Anything trapped here tilts the whole assembly.
- Hub seal
- Abrasive tracking through toward the bearing side.
If the symptom is vibration and the blades were recently changed, the hub is the next thing to rule out. blade replacement guidance.
GETTING THE RIGHT ONE
What we need in order to supply a hub that fits.
Hubs are not interchangeable across makes, and often not across wheel sizes within one make. These are the details that let an engineer identify the part instead of guessing at it.
- Machine make and model, and the wheel size if you have it.
- Number of blades the wheel carries, and whether they bolt on or slide in.
- Direction of rotation seen from the motor side.
- Shaft diameter, and the bush marking if a taper-lock bush is fitted.
- Photographs of the hub in place and of the blade seats with the blades removed.
- Any part number cast or stamped on the hub, even a partial one.
A photograph of the blade seats is usually worth more than a part number, because it shows condition as well as identity.
Send these details to an engineerWheel hub questions
Send us the wheel, not just the part name.
Hub enquiries are resolved fastest with photographs and a machine model. Tell us what the wheel is doing — vibration, uneven wear, a set that will not sit right — and an engineer will tell you whether the hub is actually the part to change.
Rotoblast manufactures this part alongside the rest of the wear items a shot blasting machine consumes. See all blast wheel spare parts
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