Ryobi Angle Grinder Disc Compatibility (2026)
Complete guide to finding the right discs for every Ryobi grinder model
Ryobi has earned a solid reputation in the UK as the budget-conscious DIY brand. Their angle grinders—particularly the ONE+18V cordless range—deliver impressive value for homeowners and light-duty users. But here’s the crucial point: Ryobi grinders use the same standard 22.23mm bore as professional brands like Bosch and Makita. This means you have complete flexibility in disc selection.
This guide covers every current Ryobi angle grinder model and shows you how to find compatible discs at the best price.
Quick Compatibility Table: Ryobi Angle Grinder Models (2026)
| Model | Type | Disc Size | Bore Diameter | Max RPM | Battery System | Power |
|---|---|---|---|---|---|---|
| R18AG-0 | Cordless | 115mm | 22.23mm | 11,000 | ONE+18V | 18V |
| R18AG7-0 | Cordless | 125mm | 22.23mm | 10,000 | ONE+18V | 18V |
| RAG800-115G | Corded | 115mm | 22.23mm | 11,000 | Mains (230V) | 800W |
Key note: All Ryobi grinders use the standard 22.23mm bore. This is universal—any third-party disc designed for this bore will work on Ryobi grinders without modification.
ONE+ 18V Cordless Models
R18AG-0 (115mm Entry-Level)
Disc size: 115mm | Bore: 22.23mm | RPM: 11,000 | Battery: ONE+18V
Ryobi’s most popular cordless grinder. Lightweight, nimble, and ideal for cutting thin steel, rebar, and light grinding. The 115mm disc is perfectly suited to DIY work and occasional professional light-duty tasks. Runtime is excellent on larger Ryobi ONE+18V batteries (3.0Ah or higher).
What it’s good for:
- Cutting angle iron and rebar for garden projects
- Cutting masonry and concrete (with diamond disc)
- Light rust removal and finishing
- One-off metalworking tasks
Common cutting discs that fit: Any 115mm disc with 22.23mm bore (Ryobi-branded, Silverline, Faithfull, Makita, DeWalt, etc.).
R18AG7-0 (125mm Brushless)
Disc size: 125mm | Bore: 22.23mm | RPM: 10,000 | Battery: ONE+18V
The newer, more powerful cordless option. Brushless motor delivers longer battery life, less maintenance, and slightly more torque than the R18AG-0. The 125mm disc is closer to professional-grade capacity while remaining manageable for DIY users. If you’re choosing between the two, this is the recommendation for serious hobbyists.
What it’s good for:
- More aggressive cutting than the 115mm
- Thicker steel and longer cuts
- Regular DIY metalworking
- Flap disc finishing work
Common cutting discs that fit: Any 125mm disc with 22.23mm bore.
Ryobi ONE+18V Battery Ecosystem
Both cordless models run on Ryobi’s ONE+18V batteries. This is excellent value if you already own other ONE+ tools (drills, saws, impact drivers, etc.)—you’re leveraging existing batteries and chargers. Ryobi ONE+18V batteries come in 1.3Ah, 2.0Ah, 3.0Ah, and 5.0Ah capacities.
Runtime tips: Use a 3.0Ah or larger battery for sustained grinding or cutting. A 1.3Ah battery will run the grinder, but expect frequent charging during longer sessions.
Corded Grinder Models
RAG800-115G (115mm 800W)
Disc size: 115mm | Bore: 22.23mm | RPM: 11,000 | Power: 800W | Cord length: Typically 2–3m
A budget corded option. Limited model range currently in UK retail. The 800W motor is modest but adequate for light cutting and grinding. No batteries to charge means unlimited runtime as long as mains power is available. Good for occasional users who prefer corded reliability.
Common discs: Any 115mm disc with 22.23mm bore.
Ryobi vs Professional Brands: An Honest Comparison
Here’s what you need to understand about Ryobi grinders:
Strengths
- Cost: Significantly cheaper than Bosch Professional or Makita. A Ryobi R18AG-0 costs roughly half the price of a comparable Bosch GWS18V-10.
- ONE+ ecosystem: If you own other Ryobi ONE+ tools, the grinder integrates seamlessly. You’re not locked into proprietary batteries.
- Reliability for DIY: Ryobi grinders work perfectly for DIY projects and light-duty use. They won’t fail on you during a garden project.
- Availability: Widely stocked in UK retail. Easy to find parts, batteries, and accessories.
Limitations
- Duty cycle: Ryobi grinders are not rated for sustained professional use. They’re designed for intermittent DIY work, not 8-hour job-site grinding.
- Motor durability: The brushed motors (in older models) wear faster than professional brushless designs. The R18AG7-0’s brushless motor is better, but still not at professional-grade durability.
- Build quality: Plastic housings and lighter overall construction. Professional tools use metal spindles and tougher bearings rated for thousands of hours.
- Vibration and control: Ryobi grinders can vibrate more than professional models, especially under load. This makes sustained grinding sessions more tiring.
- Limited disc range: While any 22.23mm bore disc fits, Ryobi doesn’t make proprietary discs (like Bosch’s X-LOCK range). You’re limited to universal third-party discs.
The Bottom Line
Buy Ryobi if you’re a homeowner, DIY enthusiast, or occasional user. The value for cost is unbeatable. Buy professional brands (Bosch, Makita, DeWalt) if you use the grinder multiple times per week or for sustained job-site work. Ryobi grinders are not inferior—they’re simply not engineered for professional duty cycles.
Best Budget Discs for Ryobi Grinders
Because Ryobi attracts cost-conscious buyers, here are the best value discs that work with every Ryobi model:
Best Budget Cutting Discs
Silverline 10-Pack Cutting Discs (115mm or 125mm)
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Price: ~£8–£10 | Per disc: ~£0.80–£1.00
The gold standard for budget-conscious DIY users. Silverline cuts cleanly, lasts reasonably long, and won’t break the bank. This is what most homeowners pair with Ryobi grinders. Available in both 115mm and 125mm.
Faithfull Cutting Discs (115mm or 125mm, 5-pack)
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Price: ~£5–£7 | Per disc: ~£1.00–£1.40
British brand with solid reliability. Slightly more expensive per disc than Silverline, but many users report longer life. Good if you want a middle ground between Silverline and premium brands.
Home.Smart Mixed Pack (115mm or 125mm, 10-pack)
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Price: ~£12–£15 | Per disc: ~£1.20–£1.50
Includes multiple grit sizes (cutting, grinding, flap). If you do mixed work (cutting and finishing), this saves buying separate packs. Good value if you want variety without overspending.
Best Flap Discs for Finishing
Silverline Flap Disc 40-Grit (125mm)
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Price: ~£1.50 per disc
A step up from hard grinding wheels. Flap discs deliver a better surface finish and last longer. 40-grit is coarse (good for weld grinding); 80-grit is finer (finishing work).
Makita Flap Disc Mixed Pack (125mm)
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Price: ~£12–£16 for mixed pack | Per disc: ~£1.20–£1.60
Comes with 60 and 120-grit discs. Professional brand at reasonable cost. Superior finish quality compared to Silverline.
Best for Concrete & Masonry Work
Silverline Diamond Cutting Disc (115mm or 125mm)
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Price: ~£8–£12 per disc
If you’re cutting tile, stone, or concrete, a diamond blade is essential. The 115mm size is better suited to the Ryobi R18AG-0 (more control). The 125mm version works on R18AG7-0.
Makita Diamond Disc (125mm, segmented)
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Price: ~£10–£14 per disc
Professional-grade diamond blade. Cuts masonry cleaner and faster than budget alternatives. Longer life justifies the higher cost for frequent users.
Best Wire Wheels for Rust Removal
Silverline Knotted Wire Wheel (115mm or 125mm)
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Price: ~£3–£5
Aggressive rust and paint removal. Knotted design resists snarling. Affordable and effective for renovation projects.
Makita Twisted Wire Wheel (125mm)
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Price: ~£5–£8
Finer wire for more delicate surfaces. Better finish than knotted wheels; less aggressive, so less risk of damage to base metal.
Money-Saving Tip: Buy in Bulk
Silverline sells 10-packs of cutting discs for around £8–£10. That works out to roughly £0.80–£1.00 per disc—cheaper than buying single discs. If you know you’ll be cutting regularly, bulk packs are the best value.
Similarly, Home.Smart’s mixed packs include cutting, grinding, and flap discs, giving you versatility without buying five separate packs.
Watch: Video Guide
Frequently Asked Questions
Will a professional brand disc (Makita, Bosch, DeWalt) fit my Ryobi grinder?
Absolutely. All these brands use the standard 22.23mm bore. A Makita cutting disc works perfectly on a Ryobi R18AG-0. The only exception is proprietary systems like Bosch X-LOCK, which only fit X-LOCK grinders—but Ryobi doesn’t make X-LOCK models, so this isn’t a concern.
Can I use a 230mm disc on my Ryobi 115mm grinder?
No. Disc size is tied to the grinder’s spindle and guard design. You must use the correct size: 115mm discs for 115mm grinders, 125mm for 125mm grinders. Using an oversized disc is dangerous and will not fit the tool.
Is the Ryobi R18AG7-0 (125mm) worth the upgrade over the R18AG-0 (115mm)?
If you only cut occasionally, the R18AG-0 is fine. If you use the grinder regularly or tackle thicker steel, the R18AG7-0’s larger disc and brushless motor are worth the extra cost. The brushless design delivers longer battery life and less vibration, making it less tiring for extended use.
Can I use Ryobi ONE+18V batteries from my drill on the grinder?
Yes. The R18AG-0 and R18AG7-0 both use standard Ryobi ONE+18V batteries. Any ONE+18V battery (1.3Ah, 2.0Ah, 3.0Ah, 5.0Ah) will work in the grinder. Larger capacity batteries give longer runtime.
What’s the best budget cutting disc for a Ryobi grinder?
Silverline 10-packs at ~£8–£10. That’s roughly 80p–£1 per disc. Consistent quality, reliable cutting, and excellent value. Most UK homeowners use Silverline on Ryobi grinders. If you want slightly longer life, Faithfull is a step up but costs more.
Are Ryobi grinders suitable for professional/job-site work?
No. Ryobi grinders are engineered for DIY and occasional homeowner use. They’re not rated for sustained professional duty (8+ hours per day). If you use a grinder multiple times per week or on job sites, invest in Bosch Professional, Makita, or DeWalt. Ryobi will overheat and fail under professional workloads.
Do Ryobi make their own angle grinder discs?
No. Ryobi doesn’t manufacture discs. They partner with third-party brands like Silverline for bundled packs, but Ryobi-badged discs are actually made by other manufacturers. This is fine—you have complete flexibility to choose any 22.23mm bore disc from any brand.
Summary: Budget Grinding Made Simple
Ryobi angle grinders deliver exceptional value for DIY users and homeowners. Both the R18AG-0 and R18AG7-0 cordless models work with any standard 22.23mm bore disc—meaning you have complete flexibility to choose budget-friendly options like Silverline or professional-grade discs like Makita, depending on your budget and project demands.
Quick buying guide:
- Occasional DIY cutting: R18AG-0 (115mm) + Silverline 10-pack cutting discs (~£8).
- Regular DIY work: R18AG7-0 (125mm) + Home.Smart mixed pack for versatility.
- Concrete/masonry: Add a Silverline diamond disc (~£8–£12).
- Rust removal: Silverline knotted wire wheel (~£3–£5).
Total cost for a complete Ryobi grinder setup with discs: ~£100–£150. Professional equivalent (Bosch + premium discs): ~£250–£350. If you’re budget-conscious, Ryobi is the clear winner.
