3.5 × 50mm Fine-Thread Drywall Screws are phosphate-finished carbon-steel fixings designed for securing plasterboard to compatible light-gauge metal drywall and ceiling-track systems.
The screws combine a sharp 25-degree piercing point with a 60-degree twin thread, allowing them to penetrate plasterboard and engage with thin metal framing quickly. A bugle-shaped head spreads pressure gradually across the board surface and creates a shallow recess for jointing compound.
Each box contains 1,000 screws and one compatible PH2 S2 driver bit.
The fine-thread design is intended for fixing plasterboard to compatible drywall studs and ceiling-track sections with a maximum supported metal thickness of 0.6mm.
Typical applications include:
Fine-thread drywall screws should not automatically be used as timber-stud screws. A compatible coarse-thread drywall screw is normally selected where plasterboard is fixed directly to timber framing.
The screw incorporates a fine 60-degree twin thread designed to provide rapid insertion and effective engagement within compatible thin sheet metal.
The twin-thread arrangement advances efficiently as the screw is driven, while the fine pitch provides multiple points of contact within the metal framing.
This helps provide:
The 25-degree sharp point is designed to pierce the plasterboard facing and enter compatible metal framing without a separate pilot hole.
The screw should be positioned square to the board and directly over the supporting framing. Firm, controlled pressure allows the point to penetrate the metal before the thread engages.
Do not use the screw where the combined metal thickness exceeds 0.6mm. Thicker steel may require a self-drilling drywall screw with an integrated drill point.
The bugle head has a gradual curved profile designed to pull into the plasterboard surface without applying an abrupt cutting force to the paper facing.
When driven to the correct depth, the head:
The head should finish slightly below the paper surface without tearing completely through it. An overdriven screw may lose much of its ability to restrain the board.
The screws use a Phillips No. 2 recess and are supplied with one compatible PH2 S2 driver bit.
A correctly fitting driver helps transfer torque positively while maintaining control as the head approaches its final depth.
A drywall screw gun or depth-setting attachment is recommended for repetitive installation because it allows each screw to be seated consistently.
The screw is fully threaded, with a nominal thread length of 45mm.
The continuous thread provides engagement along the working portion of the fixing and helps secure the plasterboard against the metal framing.
The 50mm length must still be checked against the complete board build-up. It may be suitable for thicker boards or certain layered constructions, but the specified penetration into the framing must always be maintained.
The screws are manufactured from hardened carbon steel and supplied with a dark grey or black phosphate finish.
The finish provides protection suitable for normal clean, dry internal environments. It is not equivalent to an exterior-grade coating or stainless steel.
Do not use these screws where they will be exposed to:
The screws are manufactured to the applicable drywall-fixing standard and have an A1 reaction-to-fire classification. This does not give an individual screw or plasterboard sheet a stated fire-resistance period.
Fire and acoustic performance belongs to the complete tested, classified or assessed construction, including:
Always use the screw spacing and installation sequence stated for the complete wall or ceiling system.
| Product Name | 3.5 × 50mm Fine-Thread Drywall Screws |
| Matched Manufacturer | TIMCO |
| Product Code | 00050DRY |
| Product Type | Fine-thread plasterboard fixing screw |
| Nominal Diameter | 3.5mm |
| Overall Length | 50mm |
| Thread Length | 45mm |
| Thread Type | Fine 60-degree twin thread |
| Thread Coverage | Fully threaded |
| Point Type | 25-degree sharp piercing point |
| Head Type | Bugle head |
| Drive Type | Phillips |
| Driver Size | PH2 |
| Material | Carbon steel |
| Finish | Dark grey / black phosphate |
| Maximum Metal Thickness | 0.6mm |
| Primary Substrates | Plasterboard and compatible thin sheet-metal framing |
| Primary Application | Fixing plasterboard to drywall and ceiling-track systems |
| Pack Quantity | 1,000 screws |
| Included Driver Bit | One PH2 S2 bit |
| Product Standard | BS EN 14566:2008 |
| Reaction to Fire | Class A1 |
| Corrosion Environment | Clean, dry and low-humidity internal environments |
| Suitable for Timber Studs? | No; select a compatible coarse-thread drywall screw for timber framing |
| Suitable for Exposed External Use? | No |
| Standalone Fire Resistance? | No |
| Standalone Acoustic Rating? | No |
| Size | Thread | Drive | Pack Quantity | Product Code |
|---|---|---|---|---|
| 3.5 × 50mm | Fine | PH2 | 1000 | 00050DRY |
| Diameter Options | Length Options | Thread Options | Pack Options | Total Variations |
|---|---|---|---|---|
| 3.5mm | 50mm | Fine | Box of 1000 | 1 |
Install the screws according to the plasterboard and drywall-framing system instructions. The required screw centres, board-edge distances and penetration depend on the complete wall or ceiling construction.
Confirm that:
Check that the studs or ceiling tracks are correctly positioned, securely fixed and free from excessive distortion.
All required board edges must be supported in accordance with the drywall-system design.
Offer the board to the framing and hold it flat in its final position.
Ensure that:
Fit the supplied PH2 S2 bit into a drywall screw gun or suitable variable-speed driver.
A depth-setting nosepiece is recommended for controlling the final position of the bugle head.
Hold the screw square to the plasterboard surface and directly over the metal stud or track.
Maintain the board manufacturer’s required distance from cut edges, tapered edges and board corners.
Apply firm axial pressure and drive at a controlled speed.
The sharp point should pass through the board and pierce the thin metal framing before the fine thread begins to engage.
Stop where the screw fails to penetrate. Do not apply excessive uncontrolled force, as the framing may be thicker than the supported 0.6mm limit.
Continue driving until the bugle head sits slightly beneath the board surface.
The correctly installed head should:
Do not drive the head through the paper facing or deeply into the gypsum core.
Where a screw misses the framing, spins without tightening or tears through the board paper, install a replacement fixing into sound material nearby.
Do not reuse a damaged hole. Maintain the required distance from the failed fixing and the board edge.
Continue fixing the board using the screw centres required by the particular partition, lining or ceiling system.
Wall, ceiling, fire-rated and acoustic constructions may use different fixing centres. Do not apply a generic spacing where system performance is required.
Where more than one plasterboard layer is installed:
A 50mm screw is not suitable for every multi-layer build-up. Confirm the required length from the system specification.
Before jointing, confirm that:
Cover correctly recessed screw heads using the jointing compound specified for the plasterboard system.
Do not rely on jointing compound to correct loose, protruding or overdriven screws.
These phosphate-finished screws are intended for clean, dry internal environments.
Use an appropriately corrosion-resistant fixing where the construction will be exposed to persistent moisture, exterior weather or aggressive conditions.
The screw does not independently provide acoustic or fire resistance.
The completed performance depends on the framing, board layers, insulation, fixing centres, joint treatment, perimeter sealing and installation quality.
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