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Ten minutes after unboxing the Bosch EXPERT R781 Prisma Ceramic Fibre Discs the 180 mm disc fits a large angle grinder and starts levelling raised welds with obvious speed. For metalworkers who need to move through fabrications quickly, that aggressive cut saves time on site.
⚡ At a Glance
- • Stock Removal: Up to 4x faster than Bosch R444 Fibre Disc, aggressive material take-off on steel and stainless steel
- • Prime choice for: Metal fabricators and welders smoothing raised welds and removing spatter on structural work
- • Struggles with: Fine finishing and mirror polishing; coarse G60 grit will leave scratch patterns that require finer abrasives to erase
180 mm discs with a 22.23 mm bore, G60 grit and Prisma Ceramic fibre for heavy-duty grinding. Supplied as a pack of 25 for professional large angle grinders.
📋 Technical Details at a Glance
- Quantity: 25 discs
- Diameter: 180 mm (about the diameter of a small dinner plate)
- Bore: 22.23 mm
- Grit: 60
- Abrasive material: Prisma Ceramic fibre
Refining weld removal with Prisma Ceramic technology
Prisma Ceramic technology delivers rapid stock removal, explicitly noted as up to four times faster than the Bosch R444 fibre disc. By slicing through raised weld beads and spatter, fewer passes clear joints and speed up workflow on structural steel.
Aggressive abrasion reduces grinding time on heavy builds and keeps projects on schedule. One trade-off is that G60 removes material quickly, so careful setup or a test cut prevents accidental over-grinding on thin sections.
Why Prisma Ceramic technology Is a Standout Attribute
Prisma Ceramic combines ceramic abrasive with a fibre backing to sustain cutting action across multiple discs. In a busy workshop scenario, that sustained cut keeps operators from swapping to fresh discs every few minutes, maintaining consistent removal rates through longer runs.
Consistent performance across the pack keeps job turnover steady and reduces downtime for disc changes. For workshop teams handling repetitive weld dressing, the durability boosts daily output without frequent interruptions.
Grit 60 vs raised welds
Grit 60 supplies a coarse cutting surface that bites into weld spatter and high spots rather than skimming them. Direct contact removes bulk material quickly, leaving a flat surface ready for subsequent blending.
If a smooth, polished finish is required after grinding, then follow with progressively finer abrasive discs or polishing to remove coarse scratch marks. That extra finishing step is common with coarse grits, so plan task sequences accordingly.
✨ The Standout Features of Bosch EXPERT R781 Prisma Ceramic Fibre Discs
- 22.23 mm bore – Direct fit for standard locking-nut angle grinders, avoiding adaptors
- 180 mm diameter – Covers more surface per pass, reducing number of passes
- Prisma Ceramic fibre – Maintains cutting action across multiple discs for steady removal
- Grit 60 – Rapid material removal ideal for removing weld spatters and high spots quickly
🏆 Our Verdict
Suitable for professional metalworkers and fabrication shops that need to remove welds and spatter quickly. The 180 mm discs feel substantial when mounted, and the coarse grit bites aggressively enough that you can see flatness return after a single pass. For teams who grind daily, the pack format and sustained cut deliver long-term value that justifies regular use.
