Description
The Ivy Classic angle-grinder arbor adapter converts a 5/8 in.-11 (US-thread) cup brush or wire wheel onto a metric-threaded (M10) angle grinder spindle. Zinc-plated alloy steel, hex profile for wrench fitment. Two thread pitches cover virtually every metric grinder on the market — M10x1.25mm (Bosch, Makita, Metabo, some Hitachi) and M10x1.5mm (DeWalt, Milwaukee, Ryobi, most consumer-grade metric grinders).
What This Does
Wire-brush attachments — cup brushes, wheel brushes, knot-style brushes — are dominantly available in the US with 5/8 in.-11 (5/8 inch diameter, 11 threads per inch) arbor threads, matching most US-market angle grinders. Metric-spindle grinders (sold primarily in Europe and Asia, but increasingly in US tool lineups too) use M10 metric threads, in one of two pitches: 1.25mm or 1.5mm. The grinder will reject the wrong-pitched brush even if the diameter matches.
This adapter has a 5/8 in.-11 female bore (cup brush threads in) and an M10 male shank in the chosen pitch (threads into the grinder spindle). It's the bridge between US-thread accessories and metric-thread grinders.
How to Pick Which Thread Pitch
- M10x1.25mm — Bosch (most models), Makita (most models), Metabo (most models), some Hitachi. If your grinder is a Japanese or German pro brand, this is usually the right pitch.
- M10x1.5mm — DeWalt, Milwaukee, Ryobi, Black & Decker, most consumer-grade and battery-platform US grinders that use metric spindles.
- When in doubt: remove the existing nut/disc from the grinder and look at the thread pitch with calipers, or check the grinder's documentation. The threads physically don't interchange — a 1.25 brush won't snug down on a 1.5 spindle (it'll feel loose and immediately strip the threads if used).
What You Get
- Zinc-plated alloy-steel adapter — corrosion-resistant for tool-bag and shop-floor durability
- 5/8 in.-11 female bore — accepts any standard US-thread cup brush, wire wheel, or knot brush
- M10 male shank — in your chosen pitch (1.25mm or 1.5mm)
- Hex profile — takes an open-end wrench (or strap wrench, or even pliers) to snug down or release
- Single-piece machined construction — no welds to fail at brush-rotation speed
- Sized for normal angle-grinder torque — the adapter won't fail at the grinder's rated output
Where It Fits in the Workflow
- Wire-brush kit on a metric grinder: you already own a set of 5/8 in.-11 cup brushes and the new grinder has metric threads — this lets you keep using the brushes without buying a second set.
- Job-site tool sharing: when one crew member's metric grinder needs to run a brush from another crew member's US-thread accessory kit.
- Wheel sharing across brands: some wire wheels, polishing pads, and flap discs in 5/8 in.-11 don't have a metric equivalent in your size — the adapter is the bridge.
Specifications
- Manufacturer: Ivy Classic Industries
- Models: 39091 (5/8 in.-11 to M10x1.25mm) and 39092 (5/8 in.-11 to M10x1.5mm)
- Female bore: 5/8 in.-11 UNC (US standard wire-brush arbor thread)
- Male shank: M10 metric, pitch per variant (1.25 mm or 1.5 mm)
- Material: alloy steel, zinc-plated
- Hex profile for wrench installation
- Origin: imported
Installation
Step 1: remove the existing wheel / nut / arbor cap from the grinder spindle (most grinders have a spanner wrench supplied with the tool).
Step 2: thread the adapter onto the grinder spindle by hand (M10 male end into the grinder). Snug with the hex flats using an open-end wrench — about 1/8 turn past hand-tight, no more.
Step 3: thread your cup brush or wire wheel onto the adapter (5/8 in.-11 end). Hand-tight is usually enough — the brush self-tightens against rotation under load.
Step 4: spin the grinder at low speed for a few seconds before applying to the work to confirm the brush runs true. If it wobbles, stop the grinder and re-thread — cross-threading destroys the adapter and the brush fast.
Safety Notes
- Match the brush's max RPM to the grinder. A brush rated for 10,000 RPM on an 11,000 RPM grinder is a thrown-wire hazard. Check both labels.
- Wear eye protection. Wire-brush wires shed during use — flying steel splinters are the #1 wire-brush injury.
- Verify the adapter is tight before each session. A loose adapter under load will unthread itself and throw the brush.
- Don't use damaged or partially-stripped adapters. Zinc plating wear is OK; visible thread damage or stripped flats are stop-work conditions.
What’s in the Box
- One Ivy Classic angle grinder adapter in your selected thread pitch, in retail clamshell package with safety guide
Compatible Accessories — Sold Separately
- 5/8 in.-11 cup brushes (wire or knot style) for paint, rust, weld-slag, and surface prep
- 5/8 in.-11 wire wheels for narrow-channel and crevice cleaning
- 5/8 in.-11 polishing pads, flap discs, and grinding discs that fit the same adapter
- Angle grinder spanner wrenches (most grinders include one) for tightening / loosening at the adapter's hex flats
Stop by Garoppo’s to pick one up, or schedule local delivery within our service area.