Technical Foundation
What Is a Angle Grinder?
An angle grinder is a handheld power tool that spins an abrasive disc on a right-angle drivetrain, used for cutting, grinding, surface prep and polishing across metal, concrete, masonry and tile. Disc diameter is the primary sizing spec — 4-1/2 in. and 5 in. grinders are the most common size for general fabrication and light cutting work, while 7 in. and 9 in. grinders provide the disc surface speed and reach for heavier material removal and concrete grinding, at the cost of more weight and a higher no-load RPM safety consideration.
No-load RPM and disc size are linked by a safety limit: a disc's maximum rated RPM must never be exceeded by the grinder's spindle speed, since an overspun disc can shatter under centrifugal force. Cordless angle grinders, now built on brushless motors in most professional lines, have closed the power gap with corded tools for most cutting and grinding tasks while adding cord-free mobility, but heavy continuous grinding (fabrication shops running discs all shift) still commonly favors corded tools for unlimited runtime.
Prefer a quick quote?
Get Angle Grinders Pricing in Your Inbox
Skip the search — tell us the disc size, power source and typical material and we will come back with pricing.
| Spec | What It Means | Why It Matters |
|---|---|---|
| Disc Diameter | 4-1/2 in., 5 in., 6 in., 7 in., 9 in. | Larger discs remove more material per pass but require more grinder weight/power |
| No-Load RPM | Must not exceed the disc's maximum rated RPM | Overspinning a disc beyond its rating risks the disc shattering |
| Power Source | Corded (amp rating) or cordless (voltage/Ah) | Corded gives unlimited runtime; cordless gives mobility at limited runtime per charge |
| Motor Type | Brushed vs. brushless | Brushless motors run cooler, last longer and deliver more efficient power per amp/volt |
| Switch Type & Safety Features | Paddle switch, lock-on/lock-off, kickback brake | Affects one-handed operability and compliance with jobsite safety requirements |
Shop Angle Grinders
Browse Angle Grinders Sub-Categories
Organised by disc size and power source. Pick a sub-category, or describe the material and cutting/grinding task.
How it works
From Half-Remembered Part Number to PO, in Three Steps.
Ask
Type an MPN, paste a spec sheet, or describe the part in plain English. ChatMRO understands engineer-speak.
Compare
Side-by-side specs, cross-references, and equivalents from multiple sources — without the clutter of endless browser tabs.
Quote & Buy
Request a quote or add to cart. Volume discounts, VAT-aware pricing, and consolidated procurement — all in one place.
Applications
Where Angle Grinders Get Used
Angle grinders are specified across nearly every trade that cuts, grinds or preps metal, concrete or masonry on-site or in a fabrication shop.
Metal Fabrication & Welding Shops
Weld grinding, deburring, and cutting stock metal to size as part of the fabrication workflow.
Construction & Concrete Work
Cutting rebar, grinding concrete surfaces flat, and prepping joints with diamond and abrasive discs.
Automotive & Bodywork Repair
Grinding welds, removing rust, and surface prep on body panels and frame repair.
Pipeline & Structural Steel Erection
Field cutting and beveling of structural steel and pipe on construction and erection sites.
Maintenance & MRO Repair
General-purpose cutting and grinding for equipment repair and fabrication tasks in plant maintenance.
Masonry & Tile Work
Cutting and notching tile, brick and stone with diamond blades mounted on angle grinders.
FAQ
Angle Grinders Questions, Answered
What disc size angle grinder do I need?
4-1/2 in. and 5 in. grinders are the standard choice for general fabrication, light cutting, and one-handed maneuverability in tight spaces. Step up to 7 in. or 9 in. grinders for heavier material removal, concrete surface grinding, or cutting larger stock, where the bigger disc's surface speed and reach reduce the number of passes needed — but expect more weight and typically two-handed operation.
Should I buy a corded or cordless angle grinder?
Cordless grinders, especially brushless models, now handle most cutting and grinding tasks competitively with corded tools and add mobility on jobsites without power access. Corded grinders remain the better choice for continuous, all-shift heavy grinding in a fixed shop location where unlimited runtime matters more than cord-free mobility.
Why does the grinder's RPM matter relative to the disc I'm using?
Every abrasive or cutting disc has a maximum rated RPM printed on it, and the grinder's no-load spindle speed must never exceed that rating — spinning a disc faster than it's rated for risks the disc shattering under centrifugal force, which is a serious safety hazard. Always confirm the disc's max RPM against the grinder's spec before mounting it, especially when moving a disc between grinders of different sizes.
What's the advantage of a brushless motor in an angle grinder?
Brushless motors eliminate the friction and wear of carbon brushes contacting a commutator, running cooler and lasting longer with less maintenance, while also converting battery or line power to cutting power more efficiently — meaning more torque and runtime per amp or amp-hour compared to an equivalent brushed motor.
What safety features should I look for on an angle grinder?
A lock-off or lock-on paddle switch prevents accidental startup and allows deliberate control, while a kickback brake feature stops the disc almost instantly if the grinder binds or kicks back — increasingly standard on professional-grade grinders and worth prioritizing for cutting tasks where disc binding is a real risk.
Keep browsing
Related Categories
Explore More
Find Your Next Part Now.
Describe a part number, spec or what it does.