3M 27403 Cubitron II Fibre Disc, 9-1/8", 36 Grit, 7/8" Arbor, 6 600 rpm Max

3M 27403 Cubitron II Fibre Disc, 9-1/8", 36 Grit, 7/8" Arbor, 6 600 rpm Max

• The 3M 27403 Cubitron II Fibre Disc is a heavy-duty ceramic fiber abrasive disc, sized at 9 1/8 inches in diameter with a 7/8 inch arbor hole, rated for up to 6 600 rpm. It’s optimized for aggressive stock removal, weld preparation, beveling, and metal surface work.
• Features:
  • Precision-Shaped Grain cuts faster and stays sharper longer than conventional abrasives, reducing grinding time and user fatigue.
  • Stiff fiber backing resists heat and fatigue, making the disc durable under heavy load and high pressure.
  • Closed-coat construction reduces loading when working with coated surfaces or welds.
  • Compatible with flap and fibre disc backup pads using 7/8" arbor mounting.
  • Designed for both manual and robotic grinding systems, with consistent performance under high pressure.
• Specifications:
  • Manufacturer: 3M
  • Part Number: 27403 / 982C
  • Disc Diameter: 9 1/8 inch
  • Grit: 36 (in 36+ series)
  • Arbor Hole: 7/8 inch
  • Maximum Operating Speed: 6 600 rpm
  • Abrasive Type: Precision-Shaped Ceramic
  • Backing Material: Fiber (high strength, stiff)
  • Number of Vac Holes: None / no holes
  • System Compatibility: Compatible with standard fiber disc backup pads and high-speed angle grinders; ideal for heavy weld grinding, beveling, edge break, blending, and stock removal on carbon and alloy steel.
• The 3M 27403 is also referenced as 3M Cubitron II 982C 36 fibre disc, 27403 fibre grinding disc, 9-1/8" Cubitron disc, 3M 27403 abrasive disc, and 982C Cubitron disc.

3M is a global leader in automotive innovation, manufacturing high-performance products such as adhesives, abrasives, films, and detailing solutions that enhance vehicle design, repair, and maintenance efficiency.

Q: Why does this disc cut faster than conventional fibre discs?
A: The Precision-Shaped Grain forms sharp, triangular cutting edges that continuously fracture to maintain sharpness, allowing faster material removal with less pressure.

Q: Can this disc be used on all angle grinders?
A: Yes, provided the grinder supports 9-1/8" discs and 6 600 rpm or higher, and you use a proper backup pad matching the 7/8" arbor. Always confirm your tool’s speed rating is matched or exceeded.

Q: What safety precautions should be observed when using this disc?
A: Use appropriate PPE (eye, face, hearing protection), ensure the backup pad is in good condition, avoid side loads on the disc, and keep peripheral speed under design limits. Follow manufacturer instructions and observe tool rpm safety limits.