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Silver 4-inch knot wire cup brush with bronze bristles and threaded arbor

Weiler

Weiler 12776 Knot Wire Cup Brush 4" 5/8-11 10,200 RPM

SKU CH-JE8N-99ZKF MPN 12776

4-inch bronze knot wire cup brush for right-angle grinders with 5/8-11 threaded arbor rated to 10,200 RPM

  • Product typeSanders
  • Knot wire design removes heavy scale fast
  • Bronze bristles resist loading on carbon steel
  • 4 inch cup reaches flat and contoured surfaces
  • 5/8-11 threaded arbor fits right-angle grinders
  • Rated 10,200 RPM for high-speed material removal

4" Knot Wire Cup Brush

This 4 inch knot wire cup brush mounts on a right-angle grinder via a 5/8-11 threaded arbor. Bronze bristles with a 0.02 inch wire diameter provide aggressive cleaning on carbon steel surfaces. The brush spins at up to 10,200 RPM for fast material removal.

Weld prep and rust removal

Suited for metal fabricators and maintenance crews cleaning weld seams, scale or heavy corrosion. Not intended for finishing soft metals, wood or plastics where the coarse bronze knots would gouge the workpiece. Users needing a finer surface profile should select a crimped wire or nylon abrasive brush instead.

5/8-11 threaded arbor fit

The brush only fits grinders equipped with a matching 5/8-11 spindle thread. Verify your tool’s arbor size before purchase; adapters are not included and a mismatch will prevent installation.

How it compares

Measured against everything we stock in Sanders, Rotary & Demolition Tools, at today’s prices. Recalculated every night.

Price $46.99
Pricier than about 68% of the 477 comparable items (median $21.99).

Specifications

Product
Brand nameWeiler
Model name12776
Product typeSanders

Questions about this item

What thread size does the 5/8-11 arbor need on my right-angle grinder?

The brush uses a 5/8 in.-11 threaded hole that screws directly onto a matching grinder spindle.

How do I install the cup brush without cross-threading the 5/8-11 threads?

Hand-tighten the brush onto the spindle until the knot wire face seats flush, then snug with the grinder's wrench; do not overtighten.

When should I replace the 0.02 in. bronze knot wire once it wears down?

Replace the cup brush when the 1-1/4 in. bristle length has worn short enough that the knots no longer contact the workpiece effectively.

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