Ryobi ONE+ 18V cordless circular saws typically take 165mm diameter blades, but bore size can vary between models — check your manual. This guide tells you what fits and where to find Ryobi-compatible blades in the UK.
Ryobi Cordless Circular Saw Models & Blade Specs
| Model | Blade Diameter | Bore Size | Battery Platform |
|---|---|---|---|
| RWSL1801M | 165mm | 16mm or 20mm (check manual) | ONE+ 18V |
Recommended Circular Saw Blades
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The RWSL1801M is Ryobi’s main ONE+ cordless circular saw sold in the UK. Bore size compatibility can vary depending on the production batch or market variant — always check your manual or measure the arbor shaft before buying blades.
Finding Your Ryobi’s Bore Size
The safest way is to check the product manual or the saw’s spec label. If you can’t find it:
- Measure the arbor (the metal shaft) with callipers — it should be either 16mm or 20mm
- Try a blade you know works and note the bore size
- Contact Ryobi support with your model number
Best Circular Saw Blades for Ryobi Saws
If Your Ryobi Uses 20mm Bore (Most Common)
You have access to the widest range of UK market blades. Choose any 165mm × 20mm bore option.
Best Value: Diablo 40-Tooth Thin Kerf
Diablo is the most widely available budget-friendly brand in UK retailers. A 40-tooth thin kerf cuts wood and plywood cleanly without overloading Ryobi’s motor.
Buy Diablo 165mm 40T on Amazon
Best Quality: Bosch Optiline 40-Tooth Thin Kerf
If budget allows, Bosch Optiline is sharper and lasts longer than Diablo. Both work perfectly in your Ryobi saw.
Buy Bosch Optiline 165mm 40T on Amazon
For Fine Finishes: 60-Tooth Thin Kerf
If you’re cutting melamine or laminate, a 60-tooth blade gives a cleaner edge. Available from both Diablo and Bosch ranges.
Buy 165mm 60T thin kerf blades on Amazon
If Your Ryobi Uses 16mm Bore (Less Common)
16mm bore blades are less common in the UK. Your options are:
- Search online for “165mm 16mm bore circular saw blade” — specialist suppliers may have stock
- Buy a 20mm bore blade and use a 20-to-16mm reduction ring
Buy 20mm-to-16mm bore reduction rings on Amazon
Cross-Brand Compatibility
If your Ryobi has a 20mm bore, these blades from other brands also fit:
- Makita DHS680Z (165mm × 20mm)
- DeWalt DCS391 (165mm × 20mm)
- Bosch GKS 18V-57 (165mm × 20mm)
So you’re not limited to Ryobi-branded blades — in fact, Ryobi doesn’t make as wide a range as the other brands, so buying Bosch or Diablo often gives you more choice.
Ryobi Blades vs Other Brands
Ryobi’s own blade range is limited and can be harder to find in UK shops. Diablo and Bosch offer better value and wider selection. There’s no performance penalty for using a third-party blade — fit a 165mm × 20mm blade and you’re set.
Related Pages
See the full circular saw blade compatibility guide for more on bore sizes and reduction rings. For battery and charger information, visit the Ryobi ONE+ 18V platform page.
Frequently Asked Questions
What bore size does my RWSL1801M use?
Check your manual or measure the arbor shaft with callipers. It’s either 16mm or 20mm — production variants exist. Contact Ryobi with your serial number if unsure.
Can I use a Makita blade in my Ryobi?
Yes, if both are 165mm × 20mm bore. Most Ryobi saws take 20mm bore, so Makita’s standard blades fit.
Are there Ryobi-branded circular saw blades?
Ryobi does make blades, but they’re harder to find in UK shops than Diablo or Bosch. Third-party options are better value and more available.
What blade should I buy for general Ryobi cutting?
A 40-tooth thin kerf in 165mm diameter × your saw’s bore size (likely 20mm). Diablo or Bosch Optiline are both excellent choices and readily available.
How we compile this guide
We cross-reference compatibility details against manufacturer specifications where available, official tool manuals, and the physical standards that govern fitment (bore sizes, arbor diameters, voltage platforms, connector types). We prioritise primary sources over retailer listings, flag anything we can’t confirm, and re-verify the data on a regular cycle. Where we give a buying recommendation, we tell you the reasoning — not just the link. More on our method →