Your Olfa or Fiskars handle is still perfectly good. It's the blade that's gone: nicked, dragging on the last thread of every cut, or too dull to trust near good fabric. Before you pay branded prices for a replacement, here's the actual answer on whether a Driffy 45mm blade drops straight into your existing cutter, and where the fit can go wrong. (If you don't own a cutter yet and are choosing between ours, starting from scratch instead is a different question. This page is for people replacing a blade in a handle they already own.)

Are all 45mm rotary cutter blades the same size?

"45mm" describes the blade's outer diameter, the measurement straight across the cutting disc. Every brand that sells a 45mm blade cuts it to that same diameter, because it has to fit the same size handles. That part genuinely is standardised.

What "45mm" doesn't tell you is thickness or the shape of the centre hole, and both affect fit. A 45mm blade is typically around 0.3mm thick, thin enough to seat correctly against the washer stack inside the handle. Go too thick or too thin and the blade sits loose or won't spin freely, even though the diameter is dead on.

Rotary blades also come in other sizes. 18mm, 28mm and 60mm are the common ones, and none of them are interchangeable with 45mm; they're built for different handles entirely. For the fuller picture on sizing before you buy, we've covered it in 45mm rotary blade basics.

Will Driffy 45mm blades fit an Olfa rotary cutter?

Yes, for the way most Olfa cutters are built. Olfa's standard handles, the ones you open with a nut and a spring washer rather than a push-button release, use a plain round centre hole. Driffy's 10-pack of 45mm steel blades and Driffy's titanium-coated 45mm blades both use that same round hole, so they seat on the shaft and tighten down under the nut exactly like an Olfa-branded blade would.

The exception is Olfa's tool-free "quick-change" cutters, where the blade is held in place without a nut at all. Some of those models use a blade with a shaped centre hole, cut with small notches so the mechanism can grip it without a screw. Fit a plain round-hole blade into that specific mechanism and it can end up loose. If your Olfa has a lever or button release rather than a nut you turn with your fingers, check the hole on your current blade against a new one before you fit it. If your Olfa uses a nut, you're fine.

Will Driffy 45mm blades fit a Fiskars rotary cutter?

Yes. Fiskars rotary cutters are built around a round centre hole and a nut-and-washer assembly, which is exactly what Driffy's blades are made for. Fiskars doesn't sell a tool-free notched-hole system the way Olfa does, so it's one of the more straightforward fits. You don't need to check the hole shape the way you would with an Olfa quick-change model, though it's still worth confirming your handle takes 45mm rather than 28mm or 60mm.

What other cutter brands take a standard 45mm blade?

Beyond Olfa and Fiskars, the round-hole 45mm format is what most of the market builds to, including Clover, Sew Easy, Dafa and Truecut, plus most supermarket and own-brand cutters sold in the UK. If your handle takes a standard nut-and-washer 45mm blade, which the large majority do, a Driffy blade will fit it. The handles that stand apart are the tool-free release systems with a shaped hole, and so far that's specific to part of Olfa's own range rather than a wider industry design.

Is there any difference in cutting performance when you switch brands?

Once a blade is genuinely 45mm, 0.3mm thick and correctly seated, the brand printed on the packaging doesn't change how it cuts. What changes performance is the steel quality, how the edge was ground, and how sharp it still is out of the pack. A cheap blade cut to the right dimensions from soft steel dulls faster than a well-made one regardless of whose logo is on the case, and a well-made blade from a different brand than your handle will out-cut a tired branded one every time.

Where people do notice a difference after switching brands, it's often not the blade at all. It's that they've gone from a dull blade to a sharp one and given the new brand the credit a fresh edge deserves.

What steel are Driffy blades made from, and how does it compare to Olfa/Fiskars' own blades?

Driffy's standard blades are Japanese SKS-7 tool steel, the same grade Olfa uses in its own standard rotary blades, not just a similar one. It's a high-carbon tool steel that takes a fine edge and holds it through normal quilting cotton without being so hard that it chips. Fiskars markets its own blades as precision-ground stainless steel rather than SKS-7 specifically. That's a different alloy family, built to the same job of holding an edge through fabric, so the steel itself isn't identical to ours. The size and fit are.

We also sell a titanium-coated version built on the same SKS-7 core, with a titanium nitride coating over the cutting edge. The coating doesn't change the steel underneath. It adds wear resistance, so the edge stays usable for longer, especially through denim, leather or several layers stacked at once. For a full breakdown of what the coating does and doesn't change, see how our steel and titanium blades are made.

If price rather than fit is what's holding you back from switching away from branded blades, we've weighed up whether paying more for a blade is worth it separately.

How to check your own cutter takes a 45mm blade before you order

1. Take the current blade out and measure straight across the disc with a ruler or tape measure. You're looking for 45mm, not 28mm or 60mm, which can look close enough to mistake for 45mm if you're eyeballing it rather than measuring.
2. Check the centre hole shape. Hold it up to the light. A plain circle means it's a standard round-hole blade. Small notches or flat edges cut into the hole mean it's built for a tool-free quick-change mechanism, and you'll want to match that specifically rather than assume a round-hole blade will work.
3. Look at how the blade is held in. If you undo a nut with your fingers or a small screwdriver to get the old blade out, that's the standard nut-and-washer design, and any 45mm round-hole blade will fit. If you press a button or flip a lever and the blade releases without any fastener, note the hole shape from step 2 before ordering.
4. Check the packaging or the handle itself for a printed size. Most cutters have "45mm" stamped somewhere on the body or the box it came in, which confirms what you measured.

Once your new blade is in hand, our changing the blade guide covers the washer order, which is the one step that trips people up.

FAQ

Does switching blade brands void my cutter's warranty? No manufacturer can void a warranty simply because you fitted a compatible replacement blade. That's a consumable part, not a modification to the handle. A warranty only comes into question if the handle itself is damaged by fitting the wrong size or forcing a blade that doesn't match the hole shape.

Can I mix Driffy steel and titanium blades in the same cutter? Yes. Both are 45mm, 0.3mm thick and use the same round centre hole, so you can swap between them in the same handle depending on what you're cutting: steel for everyday quilting cotton, titanium when you're going through denim or several layers.

What if my cutter isn't 45mm? Then a 45mm blade won't fit regardless of brand. Diameter is the one measurement with no flexibility. Measure your current blade first; if it comes out at 28mm or 60mm, you need a blade in that size, not 45mm, and brand compatibility doesn't come into it.