Wire Cup Brush MILWAUKEE S6 50x20 mm Steel Knurled 0.3 mm (model 4932501717)

The MILWAUKEE wire cup brush S6 with a 50 × 20 mm cup and 0.3 mm steel knurled wire is a compact accessory for mechanical surface preparation. It is intended for use with standard arbor-driven grinders or bench tools that accept cup brushes and compatible shanks. This brush is designed to remove rust, scale and paint, deburr edges and clean metal surfaces, providing a consistent finish on steel and other ferrous materials.

Advantages

The steel knurled wires provide aggressive brushing action while maintaining overall balance at operating speeds. The 50 × 20 mm cup size offers a combination of reach and control for confined areas and edges. Constructed for repeated professional and DIY use, the brush delivers predictable material removal and surface scoring appropriate for preparation before welding, painting or coating. The compact design reduces vibration transfer to the tool compared to larger cup brushes.

Suitable for

• Removing rust, scale and paint from steel surfaces
• Deburring small metal parts and edges
• Surface preparation prior to welding, painting or coating
• Cleaning weld spatter, corrosion products and light contaminants
• Use with compatible arbor-driven angle grinders and bench grinders

When it may not be suitable

This wire cup brush is not intended for use on non-ferrous or soft metals where aggressive steel wire could cause excessive scratching or material removal. It is also unsuitable for polishing tasks that require fine, non-abrasive finishes. Avoid use on plastics, wood, or painted finishes where the knurled steel wires could gouge or damage the substrate.

Key specifications

• Cup diameter: 50 mm
• Cup height: 20 mm
• Wire type: steel, knurled
• Wire thickness: 0.3 mm
• Intended tool interface: arbor-driven cup brush compatible shank
• Main applications: rust and paint removal, deburring, surface cleaning

How to use

Mount the wire cup brush securely to an arbor or spindle compatible with the tool. Verify that the tool is switched off and unplugged during fitting. Wear appropriate personal protective equipment, including eye protection, gloves and a dust mask. Start the tool at low speed and check for wobble before reaching full operating speed. Apply light to moderate pressure and move the brush across the workpiece with steady, controlled passes; avoid excessive force which can shorten brush life and increase vibration. After use, inspect the brush for wire breakage or severe wear and replace when performance deteriorates.

What to consider before purchase

• Compatibility with your grinder or bench tool arbor and maximum permitted RPM
• Suitability of steel knurled wire for the material you will work on
• Required cup diameter and profile reach for the intended tasks
• Personal protective equipment needed for wire brushing operations

Usage recommendations

Use the MILWAUKEE wire cup brush S6 at recommended tool speeds and replace the brush when wires are visibly worn or missing. For best results on painted or corroded surfaces, combine brushing with appropriate chemical treatment or grinding where necessary, and always follow safe operating practices for rotary tools.