125 mm flap disc - grinding and polishing metal

What is a flap disc?

A flap disc (also known as a flap disc or flap disc) is an abrasive tool for grinding and polishing, consisting of overlapping pieces (flakes) of abrasive paper, secured to a plastic or fiber backing. Unlike grinding wheels, flap discs provide a softer and more controlled finish with better surface quality.

Advantages of 125 mm flap discs

Before the counting discs:

• Softer processing - less risk of overheating the part
• Better surface quality — less roughness
• Less vibration and noise
• Ability to work at an angle of 15–25° (sanding 30–40°)

Before sanding:

• Significantly higher resource and productivity
• No special holder required
• Self-sharpening

How to choose grit size

Tip: Start with a coarser grit and gradually move to a finer one. For example: weld seam - P40, then P60, then P80 to prepare for painting.

Types of abrasive grain

Zircon (zirconium corundum ZA):

• Higher performance and lifespan
• Self-sharpening under load
• Ideal for stainless steel and hard metals
• Works at higher pressure without clogging
• Recommended for professional use

Corundum (aluminum oxide AO):

• More affordable price
• Well suited for carbon steel
• Optimal for household and infrequent work
• Sufficient resource for most tasks

For what work to use

• Weld cleaning — P40–P60, zircon
• Rust and scale removal — P40–P60
• Paint and Coating Removal — P60–P80
• Surface preparation for welding — P40–P60
• Preparation for painting - P80–P120
• Stainless steel processing — P60–P120, zircon only
• Sanding wood - P80–P120 (hardwood only)

Technical specifications

Frequently asked questions