pwkauka 7PCS Angle Grinder Nut Angle Grinder Flange Wrench Kit, 5/8-11 Flange Metal Lock Nut, Compatible with DeWalt, Milwaukee, Makita, Metabo, Bosch, Ryobi, Black & Decker 4.5" 5" Grinder Parts

Why I reached for this kit

Losing a grinder flange or wrench usually happens mid-project, under time pressure, and nowhere near a parts counter. That’s why I like having a universal backup set in the drawer. The PWKAUKA 7-piece flange nut and wrench kit aims to be exactly that: a straightforward, compatible replacement for common 5/8"-11 spindle grinders with enough pieces to outfit multiple tools or keep spares handy.

Over several weeks, I used the kit across a small lineup of 4-1/2" and 5" grinders in the shop, swapping between cutoff wheels, flap discs, and depressed-center grinding wheels. It did what I needed without drama—mostly.

What’s in the box

• Three inner flange nuts
• Three outer flange nuts (pin-wrench style)
• One pin spanner wrench

Everything arrived cleanly machined with a uniform black finish. The threads were free of burrs and debris, and I didn’t need to chase or clean anything before use. The spanner wrench isn’t fancy, but it’s solid and fit the included outer nuts snugly.

Compatibility and fit

This kit is built for grinders with a 5/8"-11 spindle (common on North American 4-1/2", 5", and some 7" models). It won’t work on metric M14 spindles—if you’re outfitting European-market tools, look elsewhere.

On my DeWalt and Makita handhelds, both the inner and outer flanges seated cleanly and ran true. Clamping force was consistent, and I saw no wobble with thin cutoff wheels. A Ryobi 18V grinder took the hardware without complaint as well.

Milwaukee is where things get nuanced. On a 4-1/2" Fuel model, the inner flange from this kit didn’t seat fully because the flats/keyway profile on the grinder’s spindle collar is slightly wider than the slot in the PWKAUKA inner flange. The threads fit; the mechanical indexing did not. The outer nuts threaded fine and ran true, but if your Milwaukee relies on the inner flange’s keyed engagement, you may need the OEM part. This lines up with the common caveat that some Milwaukee 4-1/2" models are picky about inner flange geometry, and the product itself cautions against compatibility on certain Milwaukee 4-1/2" grinders. If you’re running a Milwaukee, confirm fit on your exact model before committing.

One last fit note: the pin spacing on the included outer nuts and the included spanner match each other, but the hole spacing isn’t identical to every OEM outer nut. If you plan to use your brand’s factory spanner, don’t assume it will grab these outer nuts. Use the included wrench and you’ll be fine.

Build quality and materials

The manufacturer calls out carbon steel for the flanges, and that tracks with what I felt and saw. They’re not lightweight; they feel like proper hardware. After repeated swaps and a few hot grinding sessions, the threads remained crisp and the faces didn’t pick up noticeable galling. I didn’t see any heat tinting or premature wear on the seating surfaces.

The outer nuts have one flat face and one slightly raised face. That reversible geometry is helpful: I ran the flat face against thin cutoff wheels for maximum contact and flipped to the raised side for thicker depressed-center wheels. Pin holes are well-defined, and the pins on the included spanner didn’t cam out or deform under normal torque.

In use

Day to day, these flanges simply worked. I ran 0.045" cutoff wheels, 40–80 grit flap discs, and a few 1/4" grinding wheels. With the spindle locks depressed and a conservative tug on the spanner, everything stayed put—no mid-cut loosening or the telltale chirp of a wheel walking off center. Balance felt normal, and I didn’t notice any added vibration.

A few practical notes from the bench:
- Thin wheels: Orient the outer nut’s flat face toward the wheel. It reduces the risk of point loading and keeps the wheel centered.
- Flap discs: Either side of the outer nut worked, but I slightly prefer the raised face to ensure clearance around the hub.
- Hot swaps: Even after extended grinding, the nuts released cleanly with the included spanner. No tendency to seize on the threads.
- Keep a spare outer nut handy: It’s the piece most likely to wander off during a busy day.

The wrench

The included spanner is a basic, competent tool. The pins are precise for the included outer nuts and fit with minimal slop. Leverage is adequate for everyday torques; if you regularly break seized nuts loose or press grinders into heavy stock removal, a longer spanner offers more comfort, but for standard duty the included wrench suffices.

One important detail: if you’re hoping to use your grinder brand’s factory spanner with these outer nuts, you might be disappointed. The pin spacing varies among brands, and in my testing the PWKAUKA nuts didn’t always match OEM spacing. Fortunately, the included wrench pairs perfectly with the included nuts.

What could be better

• Clearer Milwaukee guidance: The kit already warns about certain Milwaukee 4-1/2" models, and my experience reinforces it. If PWKAUKA published exact inner flange slot dimensions (or a compatibility matrix by model number), it would save a lot of guesswork.
• Pin standardization: Matching common OEM pin spacing would improve mix-and-match convenience, although the included wrench solves the immediate problem.
• Markings: Lightly etching “INNER” and “OUTER” (or adding directional faces icons) on the flanges would help new users avoid orientation mistakes, especially when you’re working quickly.

Who this kit is for

• Multi-brand shops and DIYers running 5/8"-11 grinders who want spares on hand.
• Users who have misplaced their OEM wrench and nuts and want a fast, affordable replacement.
• Anyone outfitting multiple grinders with standardized hardware to cut down on tool downtime.

Who should pause:
- Milwaukee 4-1/2" users, especially on recent Fuel models. Verify inner flange fit or plan to reuse your OEM inner flange with the PWKAUKA outer nuts.

Tips for best results

• Confirm your spindle: 5/8"-11 only. If your grinder is M14, this set won’t fit.
• Mind orientation: Use the outer nut’s flat face for thin cutoff wheels; flip for thicker wheels as needed.
• Don’t over-torque: With the spindle lock engaged, snug is enough. Over-torquing makes removal harder and risks pin damage.
• A touch of anti-seize on the spindle threads helps if you do a lot of hot grinding in dirty environments.

Value

Buying OEM replacement flanges and wrenches piecemeal gets expensive quickly. This kit gives you three complete flange sets plus a dedicated spanner for the price of a single brand-name assembly. For shops that routinely misplace outer nuts or rotate grinders between tasks, that’s legitimate value. The materials and machining are better than “just in case” quality; they’re absolutely suitable for daily use.

Recommendation

I recommend the PWKAUKA flange nut and wrench kit for anyone running 5/8"-11 grinders from brands like DeWalt, Makita, Bosch, Ryobi, Metabo, and Black & Decker who wants reliable, affordable replacement hardware with spares to spare. The threads are clean, the clamping is secure, and the included spanner is a proper match for the outer nuts. My only reservation is for certain Milwaukee 4-1/2" models: the inner flange may not seat due to slightly different spindle geometry. If you’re on Milwaukee, plan to test fit the inner flange—or pair your OEM inner flange with the PWKAUKA outer nuts and wrench.

For most users with standard 5/8"-11 grinders, this kit is an easy, cost-effective yes. It’s the kind of low-drama backup that keeps projects moving when small parts go missing.