Snap Off Utility Knife Blades 18mm SK2 Steel Pack of 10

These 18mm snap-off utility knife blades are a straightforward site consumable that earns its keep. Made from SK2 high-carbon tool steel, each blade holds a sharper edge for longer than cheaper alternatives and gives you seven usable cutting sections before it needs replacing. When one segment dulls, you snap it off and carry on. No rummaging for a new blade mid-job.

The 18mm width is the standard size for most retractable snap-off knives on the market, so there is a good chance these will drop straight into what you already have on the van. They are a reliable pack to keep in the toolbox when you are working through a lot of material and do not want to stop every ten minutes to sharpen or swap blades.

What These Utility Knife Blades Are Used For

SK2 steel is a well-regarded blade material for this type of work. It has enough hardness to cut cleanly through fibrous and layered materials without the edge folding over on the first tough pull. The result is a cleaner cut with less tearing, which matters when you are scoring laminate flooring, trimming carpet around a skirting board, or cutting through roofing felt on a tight measurement.

Each pack contains ten blades. With seven snap-off sections per blade, you get seventy usable cutting edges in total from a single pack. At the price point, that represents solid value for any trade that gets through blades regularly. Decorators, flooring fitters, roofers, shopfitters, and general builders all tend to keep a stash of 18mm snap-off blades close to hand, and it is the kind of consumable worth buying in multiples rather than picking up one pack at a time from a local merchant.

SK2 Steel and Why It Matters for Utility Knife Blades

Not all snap-off blades are made equal. Lower-grade blades can feel sharp out of the pack but lose their edge quickly, meaning you are snapping off segments more often and getting through packs faster. SK2 steel has a higher carbon content that allows it to be hardened to a level suitable for precision cutting tools. The practical result is more cuts per segment, less blade waste, and a more consistent cut across the life of the blade.

The 18mm format also gives you more blade surface to work with compared to standard 9mm snap-off blades, which helps when cutting thicker or wider materials in a single pass. For heavyweight site tasks like scoring OSB, trimming insulation board, or cutting through multi-layer carpet with underlay, the wider blade holds its line better and is less likely to flex mid-cut.

Each blade has score lines at regular intervals so segments snap off cleanly with a blade snapper or a pair of pliers. The broken segments are sharp, so dispose of them carefully in a suitable container rather than leaving them loose in a toolbox. A small detail, but one worth mentioning.