Grinding disc Bosch X-LOCK R444 Expert for Metal 115 mm (O 115 mm, K 100)

Bosch X-LOCK R444 Expert grinding disc for metal, 115 mm diameter, is designed for use with X-LOCK quick-change angle grinders. The disc, indicated as O 115 mm, K 100, is made for metal grinding and surface preparation tasks. It is suitable for removing weld seams, burrs and rust on steel and other ferrous metals when used with compatible X-LOCK systems.

Advantages

The X-LOCK mounting allows fast, tool-free disc changes, improving workflow efficiency. The abrasive composition and grain size provide efficient material removal and a consistent cutting rate on metal surfaces. The disc is balanced for stable operation at typical angle grinder speeds and is compatible with standard 115 mm X-LOCK grinders for reliable attachment and use.

Suitable for (tasks / use cases)

• Removing weld seams and smoothing weld beads
• Deburring metal edges and cut parts
• Removing rust and scale from ferrous metal surfaces
• Surface preparation before painting or coating

Key specifications

• Disc diameter: 115 mm
• Mounting system: X-LOCK quick-change
• Abrasion type: designed for metal grinding
• Grain grade: K 100 (suitable for medium to coarse material removal)
• Intended material: steel and other ferrous metals

How to use

Ensure the angle grinder is compatible with the X-LOCK mounting system and disconnected from power before fitting the disc. Engage the disc into the X-LOCK adapter until it locks in place; confirm secure attachment before powering on. Use appropriate grinder speed as recommended by the grinder manufacturer and apply steady, even pressure while moving the disc across the workpiece. Maintain consistent contact angles to avoid gouging and allow the abrasive to remove material progressively rather than forcing the disc into the workpiece.

Usage recommendations

Use appropriate personal protective equipment including eye protection, gloves, hearing protection and respiratory protection when grinding metal. Avoid excessive side pressure and do not use the disc for stainless steel or non-ferrous metals unless specified by the manufacturer. Regularly inspect the disc for damage and replace if cracked, warped or excessively worn.