Grinding disc for angle grinder Dedra DED7749P, diameter 225 mm, abrasive grit 40

Dedra DED7749P is a 225 mm grinding disc intended for use with angle grinders. Supplied as a single disc, it is made with aluminium oxide abrasive in grit 40 and is designed for general-purpose material removal on metal surfaces. Typical tasks include surface preparation, removal of rust and paint, deburring and edge blending on steel and similar ferrous materials. The disc’s diameter and coarse grit make it suitable for faster stock removal while maintaining control during manual grinding.

Advantages

The 225 mm diameter provides a larger cutting area than smaller discs, enabling wider passes and fewer interruptions. The aluminium oxide abrasive (coarse grit 40) offers effective material removal on ferrous metals and is durable under moderate contact pressure. Being a single-piece disc for angle grinders, it is straightforward to mount and replace, and its open structure supports heat dissipation during continuous use.

Suitable for

• Removing rust and old paint from steel components
• Rough grinding and stock removal on metal surfaces
• Shaping and deburring edges on welded joints and cut parts
• Surface preparation before welding or primer application

When it may not be suitable

This coarse 40-grit aluminium oxide disc is not intended for fine finishing or polishing tasks; it leaves a relatively rough surface that will require finer abrasives for smoothing. It is also not optimal for non-ferrous metals where different abrasives or finer grits may be preferred to avoid clogging or excessive material removal.

Key specifications

• Disc diameter: 225 mm
• Abrasive material: aluminium oxide
• Abrasive grit: 40 (coarse)
• Intended use: metal/general-purpose grinding
• Pack quantity: single disc delivery

How to use

Fit the grinding disc to a compatible angle grinder following the tool manufacturer’s instructions and ensure the grinder is switched off and unplugged during mounting. Use appropriate disc flanges and tighten securely. During operation, hold the grinder with both hands, apply steady, controlled pressure, and move the disc across the workpiece in smooth passes. Allow the abrasive to do the cutting rather than forcing the disc, and periodically check the disc condition for wear or damage.

What to consider before purchase

• Confirm your angle grinder accepts 225 mm discs and compatible mounting flanges
• Choose grit 40 for fast material removal; plan to follow with finer grits for smoother finishes
• Verify aluminium oxide is appropriate for the metals you will work with
• Ensure you have appropriate personal protective equipment (PPE) and a tool with suitable speed rating

Usage recommendations

Wear eye protection, gloves, hearing protection and a dust mask; work in a well-ventilated area. Start with light passes to assess material removal rate, and replace the disc immediately if you observe cracks, excessive vibration, or significant wear.