3.5 × 32mm Fine Thread Drywall Screws are black-phosphate carbon-steel fixings designed for securing plasterboard and drywall boards to light-gauge steel framing or suitable timber studs.
The combination of a sharp piercing point, fine twin thread and fully threaded shank allows each screw to enter common drywall substrates quickly, normally without pre-drilling. A bugle-shaped head pulls the plasterboard firmly against the supporting framework while creating a shallow recess for jointing compound.
Each screw has a fixed specification:
These screws are intended for fixing compatible plasterboard products to supporting framework in drylining, partition and ceiling constructions.
Typical applications include:
The selected screw length must provide sufficient penetration into the supporting stud after passing through the complete board build-up.
The fully threaded shank incorporates a fine twin thread with an approximately 60-degree thread form.
The fine thread is particularly suited to light-gauge metal framing because it provides a greater number of thread engagements within the thin steel section. The twin-thread arrangement also assists rapid insertion when the screw is driven at the correct speed.
Although the screw may also be used in suitable timber studs, compatibility should be checked against the board manufacturer’s installation guidance. Coarse-thread drywall screws may be specified instead for some timber-framed applications.
The sharp point is designed to pierce the plasterboard facing and enter light steel or timber framing without a separate pilot hole under normal installation conditions.
This helps:
Pre-drilling may still be required where specified by the framing manufacturer or where the supporting material exceeds the screw’s intended capacity.
The bugle-shaped head is designed to draw gradually into the plasterboard surface rather than cutting abruptly through the paper facing.
When driven to the correct depth, the head creates a shallow recess suitable for covering with jointing compound while leaving the surrounding paper substantially intact.
The head should finish just beneath the board surface. It must not be driven so deeply that it tears through the face paper or crushes the gypsum core.
The absence of cutting nibs helps provide controlled countersinking within paper-faced plasterboard. It also reduces the risk of the head aggressively removing material around the fixing point.
The Phillips recess is compatible with a correctly sized Phillips driver bit.
Using a well-fitting bit helps:
Worn, undersized or incompatible driver bits should be replaced to prevent cam-out and poorly seated screw heads.
The screws are manufactured from carbon steel with a black-phosphate finish and low-friction coating.
The coating assists smooth driving and provides a limited level of protection during storage and use in normal dry internal conditions.
Black phosphate is not equivalent to a heavy-duty galvanised, stainless-steel or exterior-grade corrosion-resistant finish.
Do not use these screws where they will be:
Where an external-grade plasterboard or sheathing system is being installed, use only the fixing type specified by that system manufacturer.
The thread extends along the working length of the screw to provide consistent engagement with the supporting stud.
The screw should be driven until the bugle head is correctly seated. It should not be repeatedly removed and reinserted into the same damaged hole, as this can reduce holding performance.
These are drywall-board fixings and should not be treated as general structural screws.
They are not intended to:
Heavy fittings should be fixed independently into suitable framing, noggins or rated anchors.
The screw does not have an independent acoustic or fire-resistance rating.
Where it is used within an acoustic or fire-resisting partition, performance belongs to the complete tested or assessed construction, including:
Follow the board-system specification for screw centres, edge distances, penetration and layer arrangement.
| Product Name | 3.5 × 32mm Fine Thread Drywall Screws |
| Product Type | Plasterboard and drywall fixing screw |
| Nominal Diameter | 3.5mm |
| Length | 32mm |
| Material | Carbon steel |
| Finish | Black phosphate with low-friction coating |
| Thread Type | Fine twin thread |
| Thread Form | Approximately 60 degrees |
| Thread Coverage | Fully threaded |
| Point Type | Sharp piercing and self-tapping point |
| Head Type | Bugle head |
| Head Nibs | None |
| Drive Type | Phillips |
| Primary Substrates | Compatible light-gauge steel framing and suitable timber studs |
| Primary Board Type | Compatible plasterboard and drywall boards |
| Pre-Drilling | Normally not required within the intended substrate range |
| Installation Environment | Dry internal construction unless the complete system manufacturer confirms another application |
| Structural Fixing? | No |
| Standalone Acoustic Rating? | No |
| Standalone Fire Rating? | No |
| Diameter | Length | Thread | Finish |
|---|---|---|---|
| 3.5mm | 32mm | Fine | Black Phosphate |
| Diameter Options | Length Options | Thread Options | Total Base Variations |
|---|---|---|---|
| 3.5mm | 32mm | Fine | 1 |
Create a pack-quantity attribute only where the screws are genuinely stocked and priced in more than one box quantity.
Confirm suitability before using the screws with:
The board manufacturer’s tested system specification takes precedence over a general-purpose screw description.
Install the screws in accordance with the plasterboard and framing manufacturer’s instructions. The required fixing centres, edge distances and penetration depend on the complete wall or ceiling system.
Before installation, verify:
Check that the supporting studs or battens are:
Place the board against the supporting framework and hold it flat without excessive force.
Ensure that:
Fit a correctly sized Phillips driver bit into a drywall screw gun or suitable variable-speed driver.
A drywall depth-stop attachment is recommended for repetitive installation because it helps seat each screw consistently without tearing the board paper.
Replace the driver bit if it is worn or slips repeatedly within the screw head.
Hold the screw perpendicular to the board surface and aligned with the centre of the supporting stud.
Keep each fixing the minimum distance from board edges specified by the plasterboard manufacturer.
Do not install screws:
Drive the screw at a controlled speed so the piercing point enters the supporting stud and the fine thread engages cleanly.
Maintain steady alignment throughout the drive. Avoid excessive sideways pressure, which can enlarge the hole or cause the screw to enter at an angle.
Stop when the bugle head sits just beneath the plasterboard surface and forms a shallow recess for jointing compound.
The correct result should:
Do not overdrive the screw through the paper facing. Once the paper has torn around the complete head, the fixing may no longer provide the intended board restraint.
Where a screw is overdriven, loose or incorrectly positioned:
Continue installing screws at the spacing specified for the particular wall, ceiling or lining system.
Do not assume that wall and ceiling fixing centres are identical. Ceiling boards and fire-rated or acoustic systems may require closer centres or a specific installation sequence.
Where more than one plasterboard layer is installed, verify that the selected screw length is suitable for the particular layer.
A 32mm screw may be appropriate for a first layer or certain single-board constructions but may not provide sufficient penetration through a thicker multi-layer build-up.
Use the screw length specified for each layer of the tested or designed system.
Before jointing, check that:
Cover correctly recessed screw heads using the jointing compound and finishing method specified for the plasterboard system.
Do not rely on jointing compound to correct a loose, protruding or overdriven fixing.
Black-phosphate drywall screws are intended primarily for dry internal construction.
Do not use them in exposed external or persistently damp locations unless the screw supplier and complete wall or ceiling system expressly confirm suitability.
The screw does not independently provide acoustic, fire-resistance or structural performance.
The completed result depends on the board, framing, insulation, fixing centres, screw penetration, joint treatment, perimeter sealing and installation quality.
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