Abstract: Saw teeth, particularly for tree harvesting, have a wear-resistant insert or inserts of tungsten carbide, for example, oriented along the side and/or outer surface of the saw tooth, extending rearwardly from the leading edges, instead of being along the impact face as is conventional. As wear occurs, sharpness is retained longer and less material needs to be removed once sharpening is required. The principle may be adapted to a wide variety of saw tooth configurations.

Abstract: The disc saw blade has a plurality of arcuate teeth detachably mounted in complementary-shaped arcuate sockets provided in a rim portion around the circumference thereof. Each tooth has a portion butting against a stop, such as a transverse tail stop surface defined by an inward projection of the socket. The configuration provides a small throw entry gap to reduce the likelihood of sticks being thrown. The teeth preferably are detachably mounted by virtue of a tight fit within the sockets, with no use of fasteners to absorb cutting forces. Keying elements such as a male portion of generally rectangular cross-section extending from the socket into a corresponding female portion in the tooth preferably are used to ensure proper alignment of each tooth relative to the plane of the disc saw blade. Preferably, the teeth and sockets are parts of concentric circles, the diameter of the teeth preferably being slightly larger than the diameter of the sockets, thereby producing a press fit.