C2 Tongue-Fix Reduced Countersunk Tongue & Groove Flooring Screws 3.5 x 45mm Tub 350

C2 Tongue-Fix flooring screws are designed specifically for fixing tongue and groove floorboards and wall panelling. These 3.5 x 45mm screws sit in the groove of the board so the head is hidden once the next board is laid. If you have ever tried to use a standard screw for this job and ended up with a proud head that stops the next board sitting tight, you will understand why a dedicated flooring screw makes a real difference. These are proper flooring screws built for the task rather than a general-purpose substitute.

The reduced countersunk head is sized to fit cleanly into the tongue and groove profile without fouling the adjacent board. That means no manual clamping, no packing, and no awkward gaps between boards. The plain shank below the thread does the pulling work for you, drawing the board down tight to the joist as the thread bites. It is a straightforward mechanism, but it saves a lot of time when you are working across a full floor.

What Makes C2 Tongue-Fix Flooring Screws Different

C2 screws are coated with a high-molecular polymer lubricant that reduces insertion torque by up to 52% compared to an uncoated screw. On a full floor installation, that reduction adds up quickly in terms of battery life and driver wear. The coating also provides rust protection up to 20 times greater than standard zinc plating, which matters in environments where moisture levels can vary, such as ground floor installations over a sub-floor or any room that occasionally sees damp.

The dual angle thread gives these screws exceptional pull-out resistance once driven, meaning the boards stay tight over time rather than working loose with seasonal movement. Timber expands and contracts, and a screw with poor pull-out performance will eventually let boards creep. The C2 thread geometry is designed to hold firm through that kind of ongoing movement.

Twin Cut Point Technology

The patented twin cut point on each screw makes pick-up fast and consistent. It locates quickly on the timber surface and starts cutting cleanly rather than skating around before biting. More importantly, the twin cut geometry reduces the risk of splitting the tongue, which is the part of the board most vulnerable to cracking when you drive a screw in close. Splitting a tongue on a board mid-installation is the kind of thing that ruins your afternoon, so this is a more useful feature than it might initially sound.

Each tub contains 350 screws at 3.5 x 45mm, making it a practical quantity for most room-sized jobs. The tub packaging keeps screws contained and accessible on site rather than scattered across the floor, which is where they tend to end up with bag packaging. These flooring screws suit hardwood and softwood tongue and groove installations and work with standard flooring bits and impact drivers.