Norton 66623399127 Flap Disc 36 Grit Type 27 5 Inch

Product Description

The NORTON 66623399127 is a Type 27 ceramic alumina flap disc designed for aggressive material removal on steel and stainless steel surfaces. Built around a 5-inch diameter with a 5/8-11 threaded arbor hole, this disc mounts directly to standard right-angle grinders without additional hardware. The 36-grit, very coarse ceramic alumina abrasive delivers high stock removal rates on hard metals, while the polyester-backed construction resists heat and flex fatigue under sustained grinding loads. Rated at 12,000 RPM maximum, it suits production grinding, weld blending, and surface preparation tasks in fabrication and maintenance environments.

This flap disc is suited for use in metal fabrication shops, structural steel work, and field maintenance settings where rapid stock removal on carbon steel or stainless steel is required. The trimmable design allows the operator to dress the disc during use to expose fresh abrasive and extend service life. It is commonly installed by welders, ironworkers, pipefitters, and maintenance technicians using standard angle grinders with a 5/8-11 spindle.

Key Features

• 36-grit very coarse ceramic alumina abrasive for high stock removal
• Type 27 flat profile for surface grinding and weld blending
• 5/8-11 threaded arbor hole for direct spindle mounting on standard grinders
• 12,000 RPM maximum speed rating
• Trimmable construction to expose fresh abrasive and extend disc life
• Suitable for carbon steel and stainless steel applications

Compatibility

Designed to fit standard right-angle grinders equipped with a 5/8-11 threaded spindle. Compatible material applications include steels and stainless steel as specified by the manufacturer.

Installation Notes

Installation should be performed by qualified personnel following the grinder manufacturer's mounting instructions and ANSI B7.1 safety requirements for abrasive wheels. Verify the grinder's rated no-load RPM does not exceed the 12,000 RPM disc rating before mounting. Guard the grinder properly and wear appropriate PPE including a face shield before operating. Inspect the disc for damage before each use and discard any disc showing cracks, gouges, or delamination.