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Silver 6 inch cup brush with twisted knot carbon steel wire bristles and threaded 5/8-11 arbor

Weiler

Weiler 12396 6 in Cup Brush 6000 RPM

SKU CH-S9V9-1730M MPN 12396

A 6-inch carbon-steel cup brush with 0.035-inch twisted knots for right-angle grinders up to 6000 RPM

  • TypeSanders
  • Cleans aggressively with carbon-steel knot wire
  • 6 in diameter covers broad surfaces quickly
  • Threaded 5/8 in.-11 hole fits right-angle grinders
  • Rated for 6000 RPM maximum operating speed
  • 1 3/8 in bristle length reaches into corners

6-Inch Cup Brush for Right-Angle Grinders

The Weiler 12396 is a carbon-steel cup brush designed for aggressive surface preparation on a right-angle grinder. Its standard twist-knot wire construction targets weld cleaning, rust removal, and heavy deburring tasks. The 5/8 In.-11 threaded hole mounts directly onto compatible grinder spindles. This tool suits metal fabricators and maintenance crews needing a durable, high-speed brushing solution.

Replaces Worn or Smaller-Diameter Brushes

When an existing cup brush loses wire density or a narrower brush slows progress on broad surfaces, the 6-inch diameter and 1 3/8-inch bristle length expand the contact area. The jump is worth it if the grinder can sustain the rated speed without vibration and the workpiece tolerates carbon-steel wire contact. It is not for jobs requiring non-ferrous bristles or precision finishing on soft materials.

Limited by 6,000 RPM Maximum and Threaded Mount

The brush must never exceed 6,000 RPM; overspeed risks wire breakage and operator injury. The fixed 5/8 In.-11 connector restricts use to grinders with a matching spindle thread. Carbon-steel wires will contaminate stainless steel unless the workpiece is cleaned afterward. No quick-change adapter is included, so tool changes require a wrench.

Highlights

  • Cleans aggressively with carbon-steel knot wire
  • 6 in diameter covers broad surfaces quickly
  • Threaded 5/8 in.-11 hole fits right-angle grinders
  • Rated for 6000 RPM maximum operating speed
  • 1 3/8 in bristle length reaches into corners

Specifications

TypeSanders
BrandWeiler
Model12396

Questions about this item

What size threaded hole does the Weiler 12396 cup brush use to mount on a right-angle grinder?

The brush has a 5/8 In. -11 threaded hole that matches the spindle on compatible right-angle grinders.

How do you install the brush so the knot wire bristles do not loosen during operation?

Thread the brush onto the grinder spindle by hand until snug, then tighten with the supplied wrench while holding the spindle lock to prevent cross-threading.

When should the carbon-steel twist-knot wire be replaced on this 6-inch cup brush?

Replace the brush once the 0.035 in wire wears down, knots unravel, or the 1 3/8 in bristle length shortens enough to reduce cleaning aggression.

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