Norsound NOR625 Threshold Plate – 75 × 4.9mm is a low-profile aluminium plate designed for installation across the threshold of a suitable doorset.
The 75mm-wide profile creates a firm, smooth and continuous surface beneath the door. This gives a compatible automatic drop seal or door-bottom gasket a reliable surface against which to close.
It can also cover a suitable junction between adjoining floor finishes, helping create a neat transition through the doorway.
The current stocked range is available in:
Both stocked versions have a Satin Silver anodised finish and are supplied with mechanical fixings.
A threshold plate is a rigid profile installed on the floor beneath a door.
Its principal purpose is to provide an even sealing surface for a compatible door-bottom gasket.
Without a threshold plate, an automatic drop seal may need to close against:
These conditions can prevent the gasket from making continuous contact.
The NOR625 provides a stable aluminium platform across the doorway, helping the door-bottom seal close more consistently.
The NOR625 can be used beneath suitable automatic drop seals and other compatible door-bottom products.
As the door closes, the flexible gasket lowers or compresses against the upper face of the threshold plate.
A properly positioned plate can help provide:
The automatic drop seal should be adjusted only after the threshold plate and final floor finishes have been installed.
The NOR625 is an aluminium threshold plate rather than a flexible door seal.
It does not independently close the gap beneath the door.
For acoustic, smoke-control or draught-sealing applications, it normally needs to be combined with a compatible component such as:
The threshold plate provides the contact surface, while the flexible gasket creates the seal.
The gap beneath a door can provide a direct path through which airborne sound passes.
The NOR625 can support an acoustic door-sealing system by helping the door-bottom gasket maintain contact across the complete doorway.
Final acoustic performance depends on the entire assembly, including:
The NOR625 does not have a standalone decibel rating.
Any numerical sound-reduction figure applies to a complete tested doorset rather than to the aluminium plate alone.
The NOR625 is 75mm wide, providing a broader surface than the 40mm-wide NOR615 threshold plate.
The additional width may be beneficial where:
The plate must still be positioned so that the complete gasket lands on its upper surface.
A smooth and continuous threshold plate can help a compatible smoke-control gasket make reliable contact beneath a closed door.
The NOR625 itself is not a flexible smoke seal and should not be assigned an independent smoke classification.
Where smoke control is required, confirm:
The NOR625 is manufactured from aluminium and does not contain an intumescent fire-sealing element.
It does not independently provide an FD30, FD60 or other fire-resistance period.
Where it is installed beneath a fire-resisting door:
The NOR625 measures:
The low height creates a gradual transition across the doorway while the wider 75mm surface provides a generous landing area for a compatible gasket.
A correctly installed plate should:
Norseal describes the NOR625 as Document M compliant.
The low 4.9mm profile is intended to support accessible movement through suitable doorways.
The finished installation must still be assessed for:
The product specification alone cannot make an incorrectly installed threshold compliant.
When fully supported and securely fixed, the NOR625 provides a low transition suitable for normal movement through the doorway.
Potential traffic can include:
The plate must not move, flex or lift under normal use.
Proud screw heads, loose edges or an unsupported profile can create a trip or snagging hazard.
The 75mm-wide NOR625 can cover a suitable junction between adjoining flooring materials.
Possible applications include transitions between:
The plate should not be used to span a substantial unsupported void or major difference in floor level.
The underlying substrate must provide continuous support.
The current manufacturer specification identifies the NOR625 as being manufactured from:
6063-T6 grade aluminium
The aluminium provides:
The plate must be supported by the floor rather than being expected to carry loads across an unsupported gap.
The stocked product is described as Satin Silver anodised aluminium.
The current manufacturer sheet specifies an:
AA20 natural-anodised coating
The anodised surface provides:
Cut ends should be deburred carefully so that no sharp aluminium remains exposed.
The NOR625 can be installed using:
The stocked `/FX` versions are supplied with screws and plugs.
Adhesive is not supplied.
Mechanical fixing provides positive retention, while adhesive bonding can offer an installation without visible screw heads where the substrate and project specification permit it.
The chosen method must be compatible with:
Norseal lists optional “invisible” fixing as a benefit of the NOR625.
This generally refers to an adhesive-bonded installation in which no screw heads are visible on the upper face.
An adhesive installation should only be used where:
The current stocked lengths are:
Select a supplied length that is at least as long as the clear distance between the door jambs.
Yes. The aluminium profile can be machine cut to the required doorway width.
The plate should be:
Do not leave jagged, sharp or unfinished cut edges.
Subject to the applicable doorset specification, the NOR625 can provide a contact surface for suitable door-bottom seals including:
The complete flexible gasket must land within the 75mm plate width when the door closes.
| Feature | NOR625 | NOR615 |
|---|---|---|
| Width | 75mm | 40mm |
| Height | 4.9mm | 4.9mm |
| Standard lengths | 1000mm and 2100mm | 1000mm and 2100mm |
| Primary difference | Broader threshold and gasket-contact area | More compact threshold width |
Select the profile according to the floor transition, gasket landing position and applicable doorset specification.
The NOR625 can be used within suitable doorsets in:
Before ordering, confirm:
Norsound NOR625 Threshold Plate is a low-profile, natural-anodised aluminium plate for installation at the threshold of suitable doorsets.
| Product Name | Norsound NOR625 Threshold Plate – 75 × 4.9mm |
| Brand | Norsound by Norseal |
| Manufacturer Product Reference | NOR625 |
| Supplier Product Reference | NOR6/25 |
| Product Type | Low-profile aluminium doorset threshold plate |
| Application | At the threshold of suitable doorsets |
| Primary Function | Provides an even contact surface for a compatible door-bottom seal |
| Secondary Function | Covers a suitable transition between adjoining floor finishes |
| Width | 75mm |
| Overall Height | 4.9mm |
| Profile Size | 75 × 4.9mm |
| Material | 6063-T6 grade aluminium |
| Current Manufacturer Coating | AA20 natural-anodised coating |
| Stocked Finish Description | Satin Silver anodised aluminium |
| Available Lengths | 1000mm and 2100mm |
| Fixing Methods | Mechanically screw-fixed or adhesive bonded |
| Invisible-Fixing Option | Yes — adhesive bonding can avoid exposed screw heads where suitable |
| Adhesive Supplied? | No |
| Fixings Supplied with Stocked Versions? | Yes — both stocked codes have the /FX suffix |
| Accessibility | Described by Norseal as Document M compliant |
| Automatic Drop Seal Included? | No |
| Flexible Gasket Included? | No |
| Standalone Acoustic Rating? | No — performance depends on the complete doorset and compatible door-bottom seal |
| Standalone Smoke Classification? | No — the plate does not independently create a flexible smoke seal |
| Standalone Fire Rating? | No — the plate does not independently provide a fire-resistance period |
| Intumescent Material | No |
| Length | Profile Size | Finish | Fixings | Product Code |
|---|---|---|---|---|
| 1000mm | 75 × 4.9mm | Satin Silver anodised aluminium | Included | NOR6/25/1000/FX |
| 2100mm | 75 × 4.9mm | Satin Silver anodised aluminium | Included | NOR6/25/2100/FX |
Norseal’s manufacturer literature uses the following general format:
The exact stocked product codes use the alternative supplier format:
Both sets of references identify the NOR625 75 × 4.9mm threshold profile.
| Profile Size | Length Options | Finish Options | Total Combinations |
|---|---|---|---|
| 75 × 4.9mm | 1000mm and 2100mm | Satin Silver anodised aluminium | 2 |
Choose a supplied plate that is longer than or equal to the clear distance between the door jambs.
The 1000mm version is generally suitable for:
The 2100mm version is generally suitable for:
The selected door-bottom gasket should land completely on the aluminium plate when the door closes.
Check:
The wider 75mm surface offers additional tolerance compared with a 40mm threshold but must still be positioned accurately.
The NOR625 can support acoustic performance by providing a stable surface for the door-bottom seal.
It must not be assigned a standalone sound-reduction value.
Final acoustic performance depends on:
The aluminium plate itself does not provide flexible smoke sealing.
Where smoke control is required:
The NOR625 is not an intumescent product.
Before installing it beneath a fire-resisting door:
Norseal describes the NOR625 as Document M compliant.
The finished installation should nevertheless be assessed for:
The chosen fixing system must be appropriate for the underlying floor.
Potential substrates can include:
Check for underfloor heating, pipework, electrical cables and other concealed services before drilling.
Store the NOR625:
Inspect the installed threshold regularly.
Check for:
Keep the upper surface clean so the flexible gasket can make continuous contact.
Norsound NOR625 Threshold Plate can be mechanically screw-fixed or bonded using a suitable adhesive.
The plate should be cut to the clear distance between the door jambs and positioned so that the compatible door-bottom gasket lands fully on the 75mm-wide upper surface.
Inspect the doorway, door and floor.
Confirm that:
Complete the final adjustment of the door-bottom seal only after the threshold plate has been installed.
Measure the clear distance between the two door jambs at floor level.
Record this dimension as L.
Measure at the exact location where the threshold plate will sit.
Do not assume that the opening is perfectly square or that a measurement taken higher up the frame will be identical.
Close the door and identify where the automatic drop-seal or door-bottom gasket will land.
Position the NOR625 so that:
Mark the intended plate position on the floor.
Place a straight edge across the doorway and inspect the adjoining floor finishes.
Confirm that:
Prepare or level the substrate where necessary before installation.
Place the NOR625 on a stable work surface.
Measure dimension L along the profile and mark the cutting position.
Use a square to mark a line perpendicular to the length of the aluminium plate.
Check the measurement again before cutting.
Cut the NOR625 to the required length using a suitable machine saw for aluminium.
Support the 75mm-wide profile firmly during cutting.
Use controlled pressure to avoid:
Wear appropriate eye, hand and hearing protection.
Use a file or deburring tool to remove:
Clean the profile thoroughly after cutting.
No sharp aluminium should remain exposed beside either jamb.
Place the cut NOR625 between the jambs in its intended position.
Check that:
Correct the length or position before drilling or applying adhesive.
The NOR625 can be installed using:
Select the method according to:
The stocked `/FX` versions include screws and plugs.
Adhesive is not supplied.
Mark fixing positions along the threshold plate at approximately:
200mm centres
Keep the end holes suitably clear of the cut edges.
Distribute the fixing positions so that the complete plate is retained evenly and no section can lift under traffic.
Using a 4mm metal drill bit, drill through the plate at each marked position.
Support the aluminium on a suitable backing surface.
Remove metal swarf after drilling.
Countersink the fixing holes so that the supplied screw heads can finish flush with the top surface.
Do not countersink excessively.
An oversized or overly deep countersink can:
Return the drilled plate to its final location.
Mark the floor through each fixing hole while maintaining the correct plate alignment.
Remove the plate once every position has been transferred.
Before drilling the substrate, establish whether the fixing positions could affect:
Use a suitable alternative fixing method where safe drilling cannot be confirmed.
Where fixing into concrete, use a:
6mm masonry drill bit
Drill each marked position to the depth required by the supplied plugs.
Keep the drill perpendicular to the floor and remove dust from the holes.
For timber or another substrate, select the drill and fixings appropriate to that material.
Insert the supplied plugs into the drilled concrete holes.
Each plug should finish flush with the floor surface.
A projecting plug can prevent the plate from lying flat.
Place the NOR625 in its final position.
Insert the supplied screws through the countersunk holes and tighten them progressively.
Work along the plate while checking its alignment and flatness.
Every screw head must finish:
Flush with the upper surface of the threshold plate
Proud fixings can interfere with the door-bottom gasket and create a snagging point.
Tighten each screw sufficiently to secure the plate without distorting the aluminium.
Overtightening can:
Check that the complete plate remains flat after fixing.
Choose an adhesive compatible with:
Follow the adhesive manufacturer’s requirements for:
The floor and underside of the plate must be:
Allow any cleaning product to dry completely.
Turn the NOR625 over and identify the two adhesive channels on its underside.
Apply a continuous bead of suitable adhesive along the complete length of both channels.
Avoid:
Place the NOR625 onto the prepared floor in its marked position.
Press evenly along its full length and width.
Check that:
Protect the threshold until the adhesive has cured fully.
Do not expose it prematurely to:
Use temporary restraint where required by the adhesive manufacturer.
After fixing, confirm that:
Close the door and observe the flexible door-bottom gasket.
Adjust the seal so that the gasket:
The threshold plate itself has no adjustment mechanism.
Operate the door several times.
Confirm that:
Inspect the NOR625 regularly.
Check for:
Clean the plate using a soft cloth and a mild product suitable for anodised aluminium.
Avoid:
Correct measuring, cutting, fixing and door-bottom-seal adjustment are essential.
The NOR625 does not independently create an acoustically rated, smoke-control or fire-resisting doorset.
Final performance depends on:
For certified or performance-rated doorsets, install the NOR625 only in accordance with the applicable test evidence, assessment and door-manufacturer instructions.
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