Fitting types

Plate (top plate)

Bolt hole

Steel plug-in stem

Threaded pin
(product code suffix: -GS...)

Plug-in stem
(product code suffix: -ES)

Synthetic caster socket for round tubes (product code: RHR...)

Metal expander
(product code suffix: -E...)

Synthetic expander
(product code suffix: -ER.../-EV...)

The caster is fixed to a level surface using bolts and nuts. The bolt hole spaces are standardised. Plate fittings are available for both swivel and rigid casters and are used for light-duty, transport equipment and heavy-duty casters.
The plate must be aligned with the short side facing in the running direction for casters with a swivel lock.

The following dimensions must be taken into consideration when selecting the plate fitting:
• plate size (external dimensions)
• bolt hole spaces
• bolt hole Ø

The caster is attached using a connection element (e.g. a bolt) through the central hole of the swivel head. For levelling casters (series HRIG), the bolt hole has a female thread and the connection element is screwed into the central kingpin of the swivel rig from the unit side.

The load capacities specified here can only be reached if the top plate lies along the entire diameter of the swivel caster.

This fitting type does not provide positive anti-twist locking, and therefore reduces the load capacity of the swivel head brake.

Using a bolt hole to install the caster is a cost-effective solution, which only requires a single bolt (ideally in compliance with DIN 912 / ISO 4762). This fitting type is primarily used for light-duty and transport equipment casters.

The following dimensions must be taken into consideration when selecting the fitting with a bolt hole:
• plate Ø (external dimensions) (D)
• bolt hole Ø (d)

The caster is fitted using a plug-in stem, which is inserted into a corresponding tube or hole and secured. The stem fitting is fixed to the caster and a fixing bolt (cross hole) or clamp must be used to prevent it rotating or falling out. The hole must be aligned transverse to the running direction for casters with a swivel lock.

The load capacities specified here can only be reached if the top plate lies along the entire diameter of the swivel caster.

Stem fittings are primarily used for light-duty, synthetic and transport equipment casters.

A stainless steel plug-in stem fitting is available for stainless steel swivel casters.

The following dimensions must be taken into consideration when selecting the fitting with a stem:
• stem Ø (P)
• stem length (Q)
• position of the cross hole (H), if applicable
• diameter of the cross hole (d), if applicable

The caster is fitted using a threaded pin, which is bolted to the transport equipment using a female thread or a cylindrical hole and nut.

Threaded pin fittings are primarily used for light-duty casters.

A stainless steel threaded pin (-GSX...) is available for corrosion-resistant synthetic swivel casters.

The following dimensions must be taken into consideration when selecting the fixing with a threaded pin:
• threaded pin Ø (thread M10 or M12) (P)
• threaded pin length (protrusion over the caster) (Q)

The caster is fitted using a plug-in stem, which is inserted into a corresponding tube or hole using a synthetic caster socket. The pin is firmly connected with the caster. A spring washer ensures that the swivel caster cannot fall out.

Because this fitting type does not provide an anti-twist lock, a swivel head brake will have no effect.

A plug-in stem is a quick and cost-effective method for fitting the caster to the unit. Plug-in stem fittings are primarily used for light-duty casters.

The following dimensions must be taken into consideration when selecting the fitting with a plug-in stem:
• pin Ø (P)
• pin length (Q)

A synthetic caster socket is an adapter that is used to reduce the internal diameter of tubes to the diameter of the plug-in stem. The synthetic caster socket is pressed or driven into the holder on the unit (round tube). A swivel caster with a plug-in stem is then inserted into the caster socket.

The following dimensions must be considered when selecting a synthetic caster socket:
• internal tube Ø (P)
• pin Ø (d)
• fitting length (Q)
• flange length (B)

The caster is fitted using a metal expander that is inserted into a hole or a square/round tube. The bolt spreads the clamping wedge and presses it against the inner tube wall.
The tightening torque should not exceed 50 Nm. The tightening torque can be reduced to 16 Nm for low-strength thin tubes. A hexagon on the bottom side of the expander prevents the fitting from rotating relative to the caster and coming undone.
Metal expander fittings are used for light-duty and synthetic casters.

The following dimensions must be considered when selecting an expander fitting:
• internal tube dimension (P)
• tube shape (round or square tube)
• fitting length (Q)
• flange length (B)

The caster is fitted using a synthetic expander, which is inserted into a hole or a square/round tube. The bolt presses the synthetic clamping wedge against the inner tube wall.
A synthetic expander provides greater protection for the inside of the tube compared to metal expander fittings. However, it provides less holding force than a metal expander fitting. A hexagon on the bottom side of the expander prevents the fitting from rotating relative to the caster and coming undone.
Synthetic expander fittings are mainly used for light-duty and synthetic casters. A synthetic expander with a corrosion-resistant clamping screw (-EXR.../-EXV...) is also available.
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The following dimensions must be considered when selecting an expander fitting:
• internal tube dimension (P)
• tube shape (round or square tube)
• fitting length (Q)
• flange length (B)