Ryobi ONE+ 18V circular saws use different blade sizes depending on the model: the RWSL1801M and R18CSP take 150mm blades with a 10mm bore, the R18CS takes 165mm with a 16mm bore, and the brushless R18CS7 takes 184mm with a 16mm bore. Check your model before buying blades. 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 | 150mm | 10mm | ONE+ 18V |
Recommended Circular Saw Blades
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Before you buy: check that the size, fitting/bore and maximum-rated speed marked on the accessory match what your tool’s manual specifies. We have not physically tested these products; listings are compiled from published specifications. These are affiliate links.
The RWSL1801M is a 150mm ONE+ circular saw. Ryobi lists its 150mm blades with a 10mm bore for this saw, so buy 150mm x 10mm 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
Blades with a 20mm bore (fit a Ryobi 16mm saw only with a matching reduction ring)
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 a 16mm bore (R18CS and R18CS7)
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
Blades for these saws are 165mm x 20mm, so they only fit a 165mm Ryobi (R18CS, 16mm bore) with a correctly fitting 20mm to 16mm reduction ring supplied for the blade:
- 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. A third-party blade is fine as long as it matches your saw’s diameter and bore, for example 165mm x 16mm for the R18CS.
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?
The RWSL1801M takes a 150mm blade with a 10mm bore, according to Ryobi’s own blade listings (for example the CSB150A1).
Can I use a Makita blade in my Ryobi?
Only if the diameter and bore match. Makita’s 165mm blades have a 20mm bore, while the Ryobi R18CS takes 165mm x 16mm, so a Makita 165mm blade would need a properly fitting 20mm to 16mm ring supplied for that blade.
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 blade in your saw’s size: 150mm x 10mm for the RWSL1801M or R18CSP, 165mm x 16mm for the R18CS, or 184mm x 16mm for the R18CS7.
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 →