These carbide-tipped shanks are used for floors that are too hard or too thick for a steel blade to tear up. Their tips are made from black hardened tungsten carbide, which makes them significantly harder and sharper than steel blades. Carbide tipped blades are the hardest, sharpest, longest lasting blades available. These shanks are ideal for the removal of wood, any kind of stone or ceramic tile, epoxy floors, really tough thinset, paver tiles, Chattahoochee rock, AstroTurf and rubber.
The 7072-4 straight shank is 4″ wide, and commonly used to tear up plank wood floors and 6×6 or 12×12 ceramic tile squares, allowing you to come back with a wider blade for cleanup. The 7072-4 measures 4″ deep x 4″ wide x .500″ thick.
PLEASE NOTE: Attempting to resharpen a carbide blade using a metal wheel (that’s used to resharpen steel blades) will cause the carbide to fracture. Due to the nature of carbide, resharpening a carbide blade requires a special green wheel. While it is possible to do this with a hand grinder, it’s not recommended, as a single resharpen can take 30 minutes or more using such a small hand tool. A bench grinder can lower resharpening time for a carbide tip down to 5-10 minutes, depending on the blade width and how worn down it is. Carbide naturally takes longer to resharpen then a steel blade because it’s so much harder.
Additional sizes of this blade type:
(Depth x Width x Thickness)
7072-2 – 4″ x 2″ x .500″
7072-3 – 4″ x 3″ x .500″
7072-4 – 4″ x 4″ x .500″
7072-6 – 4″ x 6″ x .500″
These straight shanks fit on all of National’s Ride-on Scrapers.