Pack of 28 Koelner/Rawlplug construction screws model R-S3-PTX-40030, 4.0×30 mm with partial thread and countersunk (conical) head. These screws are intended for joining wooden elements and general structural fixings where a flush finish is required. The partial thread design provides clamping force while the smooth shank section allows the top piece to be drawn tightly to the substrate. Countersunk head enables a recessed finish suitable for further surface treatment or for use with wooden plugs.
Advantages
These construction screws combine a partial thread for secure clamping with a countersunk head that sits flush with the material surface. The 4.0×30 mm size is a common dimension for medium-duty woodworking and assembly tasks, offering straightforward installation and compatibility with standard screwdrivers or bits. Sold in a pack of 28, they are convenient for small projects, repairs and repeat fixings.
Suitable for
- Joining timber-to-timber connections in furniture assembly and carpentry
- General structural fixings where a flush head is required
- Use with compatible anchors and dowels for wood-to-masonry or mixed-material connections
- Repair, renovation and DIY projects involving medium-duty fastening
When it may not be suitable
These screws are intended primarily for use in wood and in conjunction with suitable anchors; they are not specified for use in high-load structural applications where certified structural fasteners are required. They may not be appropriate for prolonged outdoor exposure unless the specific corrosion resistance of the fastener material matches environmental requirements.
Key specifications
- Length: 30 mm
- Diameter: 4.0 mm
- Thread type: partial thread (smooth shank with threaded tip)
- Head type: countersunk (conical) head for flush finishing
- Pack quantity: 28 pieces
- Intended materials: wood and compatible anchors/dowels
How to use
Pre-drill pilot holes appropriate to the screw diameter and the density of the wood to avoid splitting; use a drill bit slightly smaller than the core diameter of the screw for hard timber and a bit closer to the outer diameter for softwood. Position the pieces to be joined, insert the screw through the top element into the lower member or anchor, and drive with a compatible screwdriver bit or drill at moderate speed until the head is flush with the surface. For use with dowels or anchors, follow the anchor manufacturer’s instructions for hole size and setting depth.
What to consider before purchase
- Confirm that 4.0×30 mm length and 4.0 mm diameter suit your material thickness and required embedment
- Check corrosion resistance of the screws for indoor or outdoor use
- Ensure compatibility with the anchors or dowels you plan to use
- Decide if the pack size of 28 meets the quantity needed for your project
Usage recommendations
Use appropriate pilot hole sizes and driving tools to prevent wood splitting and to achieve a clean, flush finish. When fixing into masonry or using anchors, pair these screws with compatible dowels and follow anchor guidance for hole diameter and depth.
