Norton 63642503532 Flap Disc 60 Grit Type 27 4.5 Inch

Product Description

The NORTON 63642503532 is a Type 27 zirconia alumina flap disc designed for aggressive material removal and surface blending on metal. The disc measures 4.5 inches in diameter with a 7/8 inch center arbor hole and runs at a maximum rated speed of 13,000 RPM. At 60 grit, it falls in the medium grade range, making it well suited for weld blending, deburring, and stock removal on steel, stainless, and other ferrous metals. The fiberglass backing provides rigidity and support during flat-face grinding applications. This disc is part of the NORTON R822 series and is sold individually per package.

This flap disc is intended for use with standard 4.5 inch angle grinders equipped with a 7/8 inch arbor. It is a common consumable on fabrication shop floors, structural steel jobsites, pipeline work, and maintenance welding applications. The Type 27 flat-profile design is appropriate for work on flat surfaces and inside corners where a depressed-center disc is required. Tradespeople including ironworkers, pipefitters, welders, and metal fabricators are the primary users of this disc type.

Key Features

• Zirconia alumina abrasive for fast cut rate and extended disc life on metal
• Type 27 flat profile suited for flat surface grinding and blending
• 60 grit medium grade balances material removal with surface finish
• Fiberglass backing provides structural support during grinding
• 13,000 RPM maximum rated speed compatible with standard 4.5 inch angle grinders
• 7/8 inch arbor hole fits common angle grinder spindles without an adapter

Compatibility

Designed as a replacement-style flap disc for 4.5 inch angle grinders with a 7/8 inch arbor attachment. Fits standard grinders accepting Type 27 discs at this diameter.

Installation Notes

Flap discs are installed and replaced by the operator before or during use — no licensed trade is required, but proper PPE including eye protection and gloves is mandatory. Always confirm the grinder's rated no-load RPM does not exceed the disc's 13,000 RPM maximum before mounting. Power down and unplug or lock out the grinder before mounting or removing the disc. Inspect the disc for damage before each use and never use a disc that shows cracking, delamination, or missing flaps.