Polishing/Grinding Disc Bosch Best for Metal+Inox R780 — 115 mm, X-LOCK, M14, round, grit 100 — for aluminium, stainless steel, non-ferrous metal, cast iron, structural steel

Bosch Best for Metal+Inox R780 is a 115 mm round polishing and grinding disc with X-LOCK mounting and M14 compatibility, designed specifically for metalworking tasks. With a grit 100 abrasive, this disc is intended for surface preparation, removal of rust and scale, deburring and producing a polished finish on aluminium, stainless steel, non-ferrous metals, cast iron and structural steel. The shape and dimensions allow use on X-LOCK angle grinders and conventional M14-mounted machines for consistent abrasive performance on a variety of metal surfaces.

Advantages

The disc combines a medium-coarse grit with a durable abrasive construction to balance material removal rate and finish quality on different metals. X-LOCK mounting ensures fast, tool-free attachment and stable operation on compatible angle grinders, while M14 thread compatibility allows use on traditional threaded spindles. The 115 mm diameter offers good access to confined areas and controllable grinding action for both flat surfaces and contoured workpieces. The product is formulated to resist clogging when working with softer non-ferrous metals and aluminium, prolonging usable life and maintaining cutting efficiency.

Suitable for

• Surface preparation prior to welding, painting or coating
• Rust and scale removal from steel and cast iron
• Deburring edges and removing weld beads
• Polishing and finishing stainless steel and aluminium components
• Shaping and light stock removal on non-ferrous metals

Key specifications

• Diameter: 115 mm
• Mounting system: X-LOCK
• Spindle compatibility: M14
• Shape: round disc
• Abrasive grit: 100 (medium-coarse)
• Recommended materials: aluminium, stainless steel, non-ferrous metals, cast iron, structural steel

How to use

Mount the disc on a compatible angle grinder using the X-LOCK system or attach via M14 thread where applicable, following the power tool manufacturer’s instructions. Secure the workpiece and ensure appropriate clamping. Start the grinder at a moderate speed to establish contact, then apply steady pressure and move the disc across the surface in a controlled motion to achieve even material removal. Avoid applying excessive force; let the abrasive cut to prevent overheating and premature wear. Periodically inspect the disc for wear and replace when abrasive performance declines or if damage is visible.

Usage recommendations

Use appropriate personal protective equipment including eye protection, hearing protection, gloves and respiratory protection when grinding or polishing metals. For best results on stainless steel and aluminium, keep the disc moving to minimize heat build-up and prevent discoloration. Match grit size and disc condition to the task—use finer abrasives after initial stock removal for a smoother finish.