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- D -
The removal of carbon from the surface of a ferrous alloy as a result of heating in a medium that reacts with the carbon at the alloy surface. This process produces a soft case/surface on the part.
A tool configured to produce a reciprocal configuration on a part, either by pressure force or by cutting.
The movement of atoms of one material into the crystal lattice of an adjoining material.
A conical or semi-spherical depression, usually for receiving the head of a fastener to allow a flush surface when the part is driven.
An interruption in the normal physical structure or configuration of a part; such as a lap, crack or seam.
A shallow concave surface, sometimes appearing in the head of a shear fastener as a result of excessive loading.
Domed Head -
Type of fastener head having a rounded, or semispherical, upper surface.
Draft Angle -
The angle or taper on an axial surface of a punch, die, mold, or part which facilitates the removal of the work after forming.
Drag Torque -
The ability of a material to deform plastically without fracturing. Indicated by elongation or reduction of area in a tensile test.
Duplex Rivet -
A two-piece rivet designed for easy upsetting and hole filling properties.
Dye Penetrant (Zyglo) -
An inspection method used for crack detection in which the part is soaked in a dye penetrant, cleaned, dried and then immersed in a developer. Ifa crack is present, the penetrant will bleed back to the surface of the part via the crack, leaving an outline of the crack on the developer. Zyglo is a proprietary dye penetrant.