Norton 77696097540 Flap Disc 4-1/2 in Type 27 Aluminum Oxide

Product Description

The NORTON 77696097540 is a Type 27 non-woven flap disc designed for surface blending, light material removal, and finishing work across metal fabrication and general grinding applications. Measuring 4.5 inches in diameter with a 7/8-inch arbor hole, it fits standard angle grinders commonly used by fabricators, ironworkers, and maintenance technicians. The disc features an aluminum oxide abrasive at a medium grade, bonded to individual flaps and supported by a fiberglass backing plate. The flat Type 27 profile keeps the abrasive face parallel to the work surface, making it well suited for flat stock and weld blending. Rated to 13,300 RPM, it meets the speed requirements of most 4.5-inch angle grinders in the field.

This flap disc is used in metal fabrication shops, structural steel work, and maintenance and repair environments where consistent surface finishing is required. The non-woven aluminum oxide construction delivers a controlled cut with reduced loading on softer metals and coated surfaces. It is appropriate for use on mild steel, stainless steel, and similar ferrous materials where a medium-grit finish pass is needed after welding, grinding, or cutting operations. The fiberglass backing provides rigidity without adding excessive weight, keeping operator fatigue manageable during extended use.

Key Features

• Type 27 flat profile for flush surface contact and weld blending
• Aluminum oxide abrasive at medium grade for balanced cut rate and finish
• Non-woven construction reduces loading and extends disc life on metal surfaces
• Fiberglass backing provides structural rigidity during aggressive passes
• 13,300 RPM max speed rating compatible with standard 4.5-inch angle grinders
• 7/8-inch arbor hole fits most common angle grinder spindles

Compatibility

Designed as an OEM-style replacement flap disc for 4.5-inch angle grinders fitted with a standard 7/8-inch arbor. Confirm your grinder's rated speed meets or exceeds the disc's 13,300 RPM maximum before mounting.

Installation Notes

Installation and use should be performed by personnel familiar with angle grinder safety practices and applicable ANSI B7.1 standards for abrasive wheel use. Always power down and disconnect the grinder before mounting or removing the disc. Inspect the disc for damage before each use and never exceed the marked maximum RPM rating. Wear appropriate PPE including a face shield, hearing protection, and gloves during operation.