Sanding Disc Bosch R444 Expert for Metal, 1 pc

The Bosch R444 Expert for Metal sanding disc is a single-piece abrasive designed for metalworking tasks. It features a semi-friable aluminium oxide abrasive on a stable vulcanised fibre backing, providing steady grinding performance for removing rust, paint and light material from metal surfaces. The disc is suitable for deburring, welding preparation and blending on carbon steel, mild steel, aluminium, non-ferrous metals and cast iron when used with compatible angle grinders or sanding attachments.

Advantages

The vulcanised fibre backing ensures consistent contact and high dimensional stability during operation, while the fully synthetic resin bond secures the abrasive grit for uniform wear and predictable results. The semi-friable aluminium oxide grit is optimized for metal applications, offering effective stock removal and surface smoothing without excessive aggression. Designed as a single disc for quick replacement, it supports controlled material removal and helps achieve an even finish on diverse metal substrates.

Suitable for

• Deburring of machined metal parts
• Preparation of weld seams and edges
• Removal of rust, paint flakes and surface contamination
• Blending and smoothing of aluminium and non-ferrous metals
• Surface conditioning of carbon and mild steel, and cast iron

Key specifications

• Abrasive type: semi-friable aluminium oxide
• Backing material: vulcanised fibre for stability
• Bonding: fully synthetic resin for secure grit adhesion
• Intended application: metal sanding, deburring, weld prep and blending
• Compatibility: angle grinders and compatible sanding attachments
• Pack: single disc

How to use

Install the sanding disc on a compatible angle grinder or sanding attachment according to the tool manufacturer’s instructions and ensure the disc is properly seated and secured. Operate the tool at the recommended speed range for the disc and apply even pressure while moving across the metal surface to avoid gouging. Use steady, overlapping passes for uniform material removal and pause periodically to inspect progress. Replace the disc when abrasive performance declines or the backing shows signs of damage.

Usage recommendations

Wear appropriate personal protective equipment such as safety glasses, hearing protection and gloves. Use a consistent working angle and moderate pressure for controlled stock removal. For stainless or highly reactive metals, verify compatibility and use suitable cooling or dust extraction to minimise heat and contamination.