In one aspect, composite tool holders are described herein comprising advantageous structural arrangements of metal carbide and alloy components. Briefly, a composite tool holder comprises a metal carbide shank comprising a bore having an inner diameter and outer diameter. An alloy sleeve is positioned in the bore for engaging a tool, wherein the alloy sleeve is bonded to inner diameter surfaces of the bore via a crosslinked adhesive.

A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises at least one -type aluminum oxide layer; and, in the -type aluminum oxide layer, a texture coefficient TC (0,0,12) of a (0,0,12) plane is from 4.0 or more to 8.4 or less, and a texture coefficient TC (1,1,9) of a (1,1,9) plane is from 0.5 or more to 3.0 or less.

A cutting tool includes: a base metal provided with a seat portion; a blade edge member that is a polycrystalline diamond sintered material containing polycrystalline diamond and a binder; and a brazing material that fixes the blade edge member to the seat portion of the base metal. The blade edge member has a thickness of greater than or equal to 0.3 mm. The brazing material is disposed between a blade edge bottom face of the blade edge member and a seat bottom face of the seat portion and is in contact with the blade edge bottom face and the seat bottom face. The flank face is located outside of the base metal with respect to the lateral face of the base metal.

Provided is a surface-coated cutting tool including a base material and a coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated. The super-multilayer-structure layer includes an X area and a Y area those are alternately repeated. In the X area, A layers having a thickness A.sub.X and B layers having a thickness B.sub.X are alternately laminated. In the Y area, A layers having a thickness A.sub.Y and B layers having a thickness B.sub.Y are alternately laminated. The thickness A.sub.X is larger than the thickness A.sub.Y, and the thickness B.sub.X is smaller than the thickness B.sub.Y. Each of the A layers and the B layers comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N.

A rod includes a first rod section occupying a predetermined region in a longitudinal direction, and a second rod section occupying a region different from the first rod section in the longitudinal direction. The first rod section has composition including A% by mass of cobalt, 0 to 1% by mass of chromium, 0 to 0.5% by mass of vanadium, and remainder of tungsten carbide and unavoidable impurities. The second rod section has composition including B% by mass of cobalt, 0 to 1% by mass of chromium, 0 to 0.5% by mass of vanadium, and remainder of tungsten carbide and unavoidable impurities. Contents of cobalt in the first rod section and the second rod section satisfy a relationship of 1% by massB<A20% by mass. The second rod section has a length of 10 to 1000% with respect to the first rod section in the longitudinal direction.

A surface-coated cutting tool includes a substrate and a coating that is disposed on the substrate and formed so as to cover at least a portion of a flank face, in which the coating includes an inner layer and an outer layer formed on the inner layer, the inner layer is formed of at least one layer and includes an aluminum oxide layer as a layer in contact with the outer layer, the outer layer has a multilayer structure that includes three or more layers stacked on top of one another, and each of the layers that constitute the multilayer structure contains titanium.

This surface-coated cutting tool includes a cutting tool body made of tungsten carbide-based cemented carbide and a hard coating layer deposited on a surface of the cutting tool body, in which the hard coating layer has at least one (Ti.sub.1-xAl.sub.x)N layer (0.4X0.7, X is an atomic ratio) with an average layer thickness of 0.5 to 10 m, the (Ti, Al)N layer has a cubic crystal structure, and IaIb<5 is satisfied when Ia (%) is an average absorptance of the hard coating layer at a wavelength of 400 to 500 nm and Ib (%) is an average absorptance of the hard coating layer at a wavelength of 600 to 700 nm.

A multilayer hard film-coated cutting tool including a cutting tool body and a multilayer hard film formed on a surface of the cutting tool body, wherein the multilayer hard film comprises at least an upper layer and a lower layer; the upper layer is made of a Ti and Si compound layer; the lower layer is made of a multi-layered film of an A-layer and a B-layer, a layer thickness of the B-layer is equal to or thicker than a layer thickness of the A-layer, a ratio of the layer thicknesses of the A-layer and the B-layer being A-layer:B-layer=1:1 to 1:2, the multilayer hard films having 2 to 8 pairs of the A-layer and the B-layer in a case where a single pair is defined by a combination of a single A-layer and a single B-layer.

A coated cutting tool includes a body and a PVD coating disposed on the body. The body being cemented carbide, cermet, ceramics, polycrystalline diamond, polycrystalline cubic boron nitride based materials or a high speed steel. The coating includes a first layer of (Ti1-xAlx)N wherein 0.3x0.7, and a second layer of (Ti1-p-qAlp Siq)N with 0.15p0.45, and 0.05q0.20, wherein the second layer is deposited outside the first layer as seen in a direction from the body.

Embodiments of the disclosure relate to a reciprocating saw blade. The reciprocating saw blade includes a body having a first end, a second end spatially disposed from the first end, a spine edge, and a cutting edge opposite to the spine edge. The reciprocating saw blade also includes a plurality of teeth defining a cutting portion of the cutting edge. Each tooth of the plurality of teeth includes a base having a unitary construction with the body. The base is made of a first material having a first hardness. A tip is welded to the base, and the tip is made of a cemented ceramic material having a second hardness that is greater than the first hardness. The cemented ceramic material includes tungsten carbide particles and at least 3 wt % of other particles including one or more cubic carbides.