4.2 × 16mm Wafer Head Self-Drilling Screws are zinc-finished carbon-steel fixings designed for joining thin metal sections within drywall framing, ceiling-track and general light-gauge metal constructions.
The integrated drill point penetrates compatible sheet steel and forms the fixing hole as the screw is driven. This allows suitable metal framing sections to be joined without completing a separate drilling operation first.
Each screw has a fixed specification:
The screws are intended for stitching compatible light-gauge metal components together during the construction of drywall and suspended-ceiling systems.
Typical applications include:
They are not standard plasterboard screws. Plasterboard sheets normally require the bugle-head drywall screws specified for the board thickness, framing gauge and complete wall or ceiling system.
The formed drill point cuts through compatible thin sheet metal before the thread engages with the material.
This combined drilling and fixing action helps:
The verified maximum drilling thickness is 3mm. This limit applies to the combined steel thickness encountered by the drill point and must not be exceeded.
After the point has drilled through the metal, the self-tapping thread forms and engages its mating thread within the steel.
The screw must be driven at a suitable speed and kept square to the fixing surface so that the drill point cuts cleanly before the thread begins to pull the components together.
Do not describe the thread as a fine drywall-board thread. Its purpose is to join thin metal framing components rather than secure a gypsum board face.
The broad wafer head provides a large bearing surface while maintaining a relatively low installed profile.
This helps:
The wafer head remains visible above the metal surface. It does not countersink into the substrate.
The screw uses a Phillips No. 2 recess and is supplied with one compatible PH2 S2 driver bit per box.
A correctly fitting PH2 bit helps:
Replace the supplied bit when it becomes worn or begins slipping repeatedly.
The screws are manufactured from carbon steel and finished with zinc for use in clean, dry internal construction environments.
The zinc finish provides limited corrosion protection during storage and normal internal service. It is not an exterior-grade coating and should not be treated as suitable for exposed or persistently damp conditions.
Do not use these screws where they will be subjected to:
The screws are suited to internal drywall-track and ceiling-track construction where the framing remains within a clean, dry building environment.
Where light-gauge metal framing is used externally or within a higher-corrosion environment, select a fixing with an appropriate exterior corrosion rating.
The screw does not independently provide a fire-resistance period or acoustic rating.
Where used within a fire-rated or sound-insulating construction, performance belongs to the complete tested or assessed system, including:
Use the screw only at the locations permitted by the system specification.
| Product Name | 4.2 × 16mm Wafer Head Self-Drilling Framing Screws |
| Matched Manufacturer | TIMCO |
| Product Code | 00016WHSD |
| Product Type | Metal-construction sheet and framing screw |
| Nominal Diameter | 4.2mm |
| Length | 16mm |
| Head Type | Wafer head |
| Drive Type | Phillips |
| Driver Size | PH2 |
| Point Type | Self-drilling |
| Thread Type | Self-tapping |
| Material | Carbon steel |
| Finish | Zinc |
| Maximum Drilling Thickness | 3mm combined compatible sheet steel |
| Primary Substrates | Thin sheet metal and drywall framing |
| Primary Application | Stitching drywall track, ceiling track and compatible light-gauge metal framing components |
| Pack Quantity | 1,000 screws |
| Driver Bit Included? | Yes, one PH2 S2 bit |
| Corrosion Rating | Rating 1: clean, dry and low-humidity environments |
| CE Standard | BS EN 14566:2008 and BS EN 10666:2008 |
| Reaction-to-Fire Classification | A1 |
| Suitable for Exposed External Use? | No |
| Plasterboard Sheet Fixing? | No; use the specified bugle-head drywall screw for fixing plasterboard sheets |
| Standalone Fire Resistance? | No |
| Standalone Acoustic Rating? | No |
| Size | Head | Drive | Pack Quantity | Product Code |
|---|---|---|---|---|
| 4.2 × 16mm | Wafer | PH2 | 1000 | 00016WHSD |
| Diameter Options | Length Options | Pack Options | Total Variations |
|---|---|---|---|
| 4.2mm | 16mm | Box of 1000 | 1 |
Use these screws to join compatible thin metal framing components in accordance with the drywall or ceiling-system specification.
Before installation, confirm that:
Do not use the screw as a substitute for the specified plasterboard fixing.
Check that the framing sections are:
Hold or clamp the overlapping metal sections firmly in their final position.
Gaps between the components can allow the drill point to push one section away before the thread engages. Both pieces should remain in contact during drilling.
Insert the supplied PH2 S2 bit into a suitable variable-speed drill-driver or screw gun.
Check that the bit fits fully into the Phillips recess. Replace it if it is worn or repeatedly slips from the screw head.
Place the self-drilling point square to the metal surface at the specified fixing position.
Avoid fixing:
Apply firm axial pressure and start the driver at a controlled speed.
Keep the screw perpendicular to the surface while the drill point cuts through the first and second metal layers.
Do not immediately operate the driver at uncontrolled maximum speed, as this can cause the point to skate across the surface or overheat before drilling through.
Once the drill point has penetrated the metal, continue driving so that the self-tapping thread forms and engages within the steel.
The screw should begin pulling the framing sections tightly together.
Stop and investigate where:
Stop when the underside of the wafer head is firmly seated against the metal surface.
The head should clamp the components together without crushing, tearing or excessively deforming the framing.
Do not continue driving once the screw is secure. Overtightening can strip the thread formed within thin steel and reduce the holding capacity.
Confirm that:
Install the remaining screws according to the framing or drywall-system instructions.
Do not add unnecessary fixings through resilient or deflection details where the system requires movement.
Once the metal frame is complete, secure the plasterboard using the board screw specified for:
Do not use the 16mm wafer-head framing screws to attach the plasterboard face.
Follow the exact tested or assessed framing arrangement where the partition or ceiling requires a stated fire-resistance period.
The number and position of framing screws, board fixings, joints, tracks and deflection details must match the system specification.
Avoid installing screws that bridge isolation components or make unintended contact between separated framing elements.
An incorrectly positioned metal fixing can create a rigid path through an otherwise decoupled acoustic construction.
Before boarding over the frame, verify that:
The zinc-finished screws are intended for clean, dry and low-humidity internal environments.
Use an appropriately classified exterior or corrosion-resistant screw for exposed, damp or corrosive installations.
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