3M SR Cutter No.3, 0.40 in x 0.975 in, 50/Carton, 2Case of 50

• Cleans without chemical solvents, eliminating chemical mess and waste
• Easy-to-use cutter attaches to a rotary tool to replace time-consuming hand scraping with metal scrapers that gouge the workpiece
• Metal mandrel fits a right angle power tool
• No. 3 cutter is for flat applications—its 0.4" diameter fits between rivets and into tight spaces
• No. 8 cutter is 1" in diameter and has an internal cavity designed to fit directly over rivets or other protrusions for thorough cleaning
• Primarily used in the aerospace industry
• Removes sealants and coatings cleanly with minimal or no abrasion to underlying paints, primers or metal

The 3M SR Cutter is a plastic rotary cutting tool with an attached 1/4"-28 male threaded metal mandrel for use on slow speed right angle drills. The SR Cutter works quickly and efficiently to peel off sealants or other thick coatings with minimal to no abrasion to the underlying base material, replacing tedious scraping by hand and messy chemical solvents.

A Great Alternative to Tedious Hand Scraping
We designed the 3M SR Cutter to save time and increase productivity for cleaning operations typical in the aerospace industry. Two different sizes are available to enable effective coating removal—No. 3 for flat surfaces and No. 8 for cleaning on and around rivets or other fasteners. The cylindrical blades work both horizontally and vertically against the workpiece to cut through sealants such as polysulfide, polythioether, polyurethane, RTV sealants and silicones. The plastic blades work effectively without the operator having to pause and resharpen them. The SR Cutter works fast and helps eliminate follow-up work for repainting or repairing damaged coatings.

Cleanly Replaces Chemical Solvents
Not only is the 3M SR Cutter a great alternative to hand scraping, but it works without the use of messy chemical solvents. It enables operators to remove sealants and residues immediately, without having to wait for chemicals to act or spending time and effort handling and cleaning up a hazardous mess. Your only waste is the sealant itself.

Using the 3M SR Cutter

• No. 3 Cutter: For fillet seals and flat applications, place the No. 3 SR Cutter at head of sealant bead so that the side of cutter contacts the sealant. Apply firm pressure downward onto the sealant and use low rotational speed (throttle down on drill) to remove sealant from one spot without moving the drill back and forth. When the substrate is exposed, increase the rotational speed of the drill and move the tool along the strip of sealant, making sure that the cutter blades adjacent to the substrate rotate into the remaining sealant bead.


• No. 8 Cutter: For fastener heads, be sure that the inner diameter of the No. 8 SR Cutter will completely fit over the head of the fastener. Place the cutter on top of the fastener with firm pressure. Using the drill throttle, run at low speed to cut away sealant from around the fastener. Remove the sealant by "jogging" the drill in a start-stop fashion several times—this prevents unwanted frictional heat that may degrade the sealant or blunt the cutter.

3M SR Cutter Model

The 3M SR Cutter No.3 is designed to clean surfaces efficiently without chemical solvents. This model attaches easily to rotary tools, replacing slow hand scraping and reducing mess. Its design suits aerospace cleaning tasks where precision matters.

With a metal mandrel that fits right angle power tools, the No.3 cutter offers a practical solution for removing sealants and coatings. It helps maintain the integrity of underlying materials like paints and metals during cleaning.

Precise Dimensions Included

This cutter measures 0.40 inches by 0.975 inches, making it ideal for flat applications. Its compact size allows it to fit between rivets and into tight spaces, ensuring thorough cleaning without damage.

These exact dimensions enable the cutter to work efficiently on delicate surfaces, especially in aerospace settings where precision is critical. The size supports quick removal of sealants with minimal abrasion.

Pack Count Advantages

The product comes in a pack of 50 cutters per carton, with 250 cutters per case. This bulk packaging supports large-scale operations and helps maintain a steady supply for ongoing maintenance tasks.

Having 250 cutters in a case ensures that aerospace professionals can rely on consistent availability. It reduces downtime and supports efficient workflow during sealant removal and surface preparation.

Easy Attachment System

The cutter includes a 1/4"-28 male threaded metal mandrel, allowing quick attachment to slow speed right angle drills. This system simplifies tool setup and improves productivity during cleaning jobs.

Using the threaded mandrel, operators can switch cutters quickly without complicated adjustments. This feature supports continuous work and reduces interruptions in aerospace maintenance tasks.

Effective Cleaning Performance

The No.3 cutter is designed for flat surfaces and works by cutting through sealants like polysulfide and polyurethane. It removes coatings cleanly with minimal abrasion, preserving underlying paints and metals.

Its plastic blades stay sharp longer and eliminate the need for chemical solvents. This makes the cutter a practical choice for aerospace cleaning, saving time and reducing hazardous waste.