Aluminium Profile Castors

OEM / ODM Available Free Sample Available ISO 9001:2015 ISO 14001 RoHS REACH

Castors for aluminium profile frames in seven configurations — plate fixed, swivel, braked and thread stem — rated 60 to 300 kg per castor, supplied with the matching base or mounting plate.

Wholesale Price $1.80 - $12.50 / pc per pc

Material	Zinc-plated steel bracket, polyurethane / nylon / rubber wheel
Alloy Grade	Aluminium core on heavy-duty wheels
Temper	custom
Section Size	Wheel Ø50–200 mm
Slot	Plate 60x60 / 100x100 mm; thread stem M12 / M16
Length	Overall height 72–245 mm depending on wheel diameter
Tolerance	±0.5 mm on plate hole pattern
Surface	Zinc plated / stainless steel
MOQ	100
Lead Time	15-25 days after deposit
Loading Port	Shanghai / Ningbo
Supply Ability	60,000 pcs per month
Payment Terms	T/T 30% deposit + 70% before shipment \| L/C at sight
Trade Terms	FOB \| CIF \| EXW
Certifications	ISO 9001:2015 \| ISO 14001 \| RoHS \| REACH

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Floor elements · Mobile frames

A castor is the load path between a moving aluminium frame and the floor. On a profile system the castor never bolts to the profile directly — it bolts to a base plate or foot mounting plate, and that plate is what spreads a point load into the end face of the extrusion.

We build seven castor configurations on one shared mounting footprint, from 60 kg to 300 kg per castor. Because the plate geometry does not change between them, a trolley can start as a fixed-wheel unit and be upgraded to a braked swivel unit later without touching the frame. Every order ships with the plate bolts, the wheel material data sheet, and a per-castor load calculation for the frame you describe.

The mounting interface decides the castor, not the wheel

Buyers usually start by choosing a wheel diameter. In practice the mounting interface is the decision that is expensive to reverse. A plate-mounted castor needs a flat, drilled surface with enough bolt spacing to resist the overturning moment; a thread-stem castor needs a tapped hole and only works where the leg ends in a solid block rather than an open profile slot.

Both types are supplied here on the same plate and stem standards, so the choice comes down to how the leg is built rather than to availability. If the leg is a standard 40 or 45 series profile, the plate route through a foot mounting plate is almost always the simpler one.

Configuration	Wheel Ø	Load per castor	Where it is used
Plate fixed	50–100 mm	80–120 kg	Two wheels on one end of a trolley, keeping it tracking straight
Plate fixed, heavy	100–150 mm	150–300 kg	Heavy gantries and tool cabinets that are pushed, not steered
Plate swivel	50–125 mm	60–150 kg	The default steering end of a mobile workstation
Plate swivel, braked	50–125 mm	60–150 kg	Any frame that must lock in position while work is carried out
Plate swivel, heavy	125–200 mm	150–300 kg	Mobile machine bases, weld tables, heavy assembly fixtures
Thread stem swivel	50–100 mm	60–120 kg	Legs that end in a tapped block or a threaded insert
Thread stem swivel, braked	50–100 mm	60–120 kg	Adjustable-height mobile frames with locking requirement

Reading a castor rating the way a buyer should

The number printed on a castor is a static laboratory rating. What a frame actually sees is lower, and the gap is where most mobile frames fail. Three corrections matter.

Use three castors, not four, in the calculation. Floors are never perfectly flat, so on a four-castor frame one wheel usually carries little or no load while the diagonally opposite one carries double. Designing on the assumption that three castors share the total weight is the standard safe rule.
Derate for speed. A rating quoted at walking pace falls by roughly a third once the trolley is pushed at speed over an expansion joint, because the impact is dynamic rather than static.
Check the swivel offset. The distance from the swivel axis to the wheel centre creates the trailing action that lets the castor steer. A larger offset steers more easily but raises the frame slightly and increases the overturning moment on the plate.

Practical point: if you tell us the total loaded weight and the number of castors, we will return the rating each castor has to meet — including the three-castor derating — before you commit to a wheel size. It takes less time than replacing a collapsed wheel.

Wheel materials and where each one belongs

Polyurethane on aluminium coreThe default for workshop and assembly floors. Rolls quietly, resists oil and swarf, and does not mark epoxy or painted flooring.

Nylon (PA6)Highest load for its diameter and the lowest rolling resistance. Noisier, and less forgiving on cracked or uneven concrete.

Elastic rubberChosen for quiet running and for absorbing vibration, at the cost of a lower load rating and more effort to push.

Cast iron / steelFor very high loads and hot environments. Hard on floors, so it is normally paired with a steel track rather than used on finished concrete.

Matching a castor set to an aluminium frame

Confirm the leg end A profile that ends open needs a base plate or mounting plate; a leg that ends in a machined block can take a thread stem. This single answer removes half the catalogue.
Fix the load case Total loaded weight, plus the weight of the frame itself, divided by three. Add the derating for speed if the trolley is pushed rather than positioned.
Choose the steering layout Two swivel castors on the steering end and two fixed on the trailing end tracks straight. Four swivel castors manoeuvre in any direction but are harder to keep in a straight line.
Decide the braking requirement If work is carried out on the frame, at least two braked castors are needed — and they should be the two that carry most of the load when it is stationary.
Confirm the floor Smooth epoxy floors suit polyurethane; rough concrete suits a larger diameter wheel; grated or slotted floors need a wheel wide enough not to drop in.

What we manufacture and what we customise

The castors, plates and stems are produced to our own drawings, and the mounting plate patterns are held as standard tooling. That means the bolt spacing on our castor plate matches our base plate and mounting plate without adaptors, which removes the tolerance stack-up that appears when a castor, a plate and a profile come from three different suppliers.

For OEM programmes we machine the plate pattern to the customer’s own leg geometry, mould or machine the wheel in a specified hardness, and print the customer’s part number and batch code on the plate. Tooling for a custom plate pattern is quoted once and then amortised across the programme.

Standard plate patternsHeld as tooling, so no adaptor and no tooling charge.

Custom plate geometryMachined to your leg drawing, tooling quoted once.

Wheel hardnessShore A specified per application, batch certificate supplied.

Private labelPart number, logo and batch code marked on the plate.

Frequently asked questions

How many castors should a mobile frame have?

Four is the practical minimum for stability, and six is common on long trolleys to stop the frame sagging in the middle. Whatever the number, size the castors on three of them carrying the whole load, because uneven floors mean one castor is usually unloaded.

Do I need a base plate to fit a castor to a profile?

For a plate-mounted castor, yes. The plate spreads the load into the end face of the extrusion and provides the bolt pattern. A thread-stem castor can go directly into a tapped end, but only where the leg end is solid enough to take the thread.

Which castors should be braked?

Braked castors should be the pair that carries the load when the frame is stationary, which is normally the two swivel castors. On a frame where work is carried out at height, brake all four and add a floor lock for the final hold.

Can the castors be supplied with the frame as a kit?

Yes. We supply cut, machined and marked profile members together with the base plates, castors and fasteners, bagged by assembly. That is the usual route for OEM trolley and workstation programmes, and it removes a second supplier from the tolerance chain.

What floor will the wheels damage?

Polyurethane and rubber wheels are safe on epoxy, vinyl and painted floors. Nylon and cast iron can mark softer finishes and are normally specified for concrete or steel-track installations.

Can you produce a custom castor plate for our leg?

Yes. Send the leg end geometry and the load case and we will quote a custom plate pattern, including the tooling, with the amortised unit price for your expected volume.

Send us the frame and we will size the castors

Tell us the loaded weight, the number of castors and the leg end detail. We will return the rating each castor has to meet, the plate pattern that fits your profile, and FOB pricing within one working day.

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