McGuire Glossary of Fastener Terminology

D - 13 terms

DEEP DRAW STAMPING - During deep draw stamping operations, a sheet metal blank is pullled into a die via a punch, which forms the sheet metal into the desired shape. The depth of the drawn component must exceed its diameter for the process to be considered a deep draw.

DIMPLE - The cone shaped indentatioin which is applied to the point end of type FH and HFH studs and to the head end of typeTFH studs. The dimple is a registered trademark and is used to tell PEM(R) studs from studs manufacturered by competitors.

DIMPLING - Term used to describe the act of applying the thread lock to SI inserts.

DIP AND DRAIN - In the conventional dip drian coating process, the parts to be coated are immersed in the paint and them removed at a controlled speed. The dip drain coating process uses both solvent-based and water-based dip coatings. The advantage of this process is the high degree of automation and the complete painting of the components with minimal loss of coating material - no overspray.

DIP SPIN - The coating of small parts (i.e.bulk material) often takes place in a dip-spin process. In this process. the coating is applied to the parts in a basket or a barrel. The basket is then immerersed in a dip tank where the paint wets the entire surface of the parts. While immersed in the coating, the basket is slowly rotated which assists in te elimination of air-pockets and improves coverage. After the dipping process, the basket is removed from the dip-tank and rotated or centifuged, so that the coated parts are thrown against the outer wall of the basket. Excess coating is removed from the parts due to the centrifugal force and escapaes throufh small holes in the basket back into the dip tank.

DISPLACER - The portion of a self-clinching fastener that moves, or displaces, the panel material. Usually the head, lugs or knurled portion of the fastener. It could be a cylinder, a knurl, or a hex.

DOUBLE KNURLING - A defective condition which occurs when a knurl does not track properly and produces twice as many teeth per inch on the work as were present on the knurling wheel.

DOWNLOAD - The transmission of a file or data from one computer to another over a network, usuallyfrom a larger server to a user device.

DRAFT/DIS DRAFT INTERNATIONAL STANDARD - A preliminary version of a standard with a final version to be published later.

DRAWING - Primarily used in the creation of electronic components, drawing is a process that uses tensile force to shape the component into a desired thickness and shape. During the drawing process, blanks are drawn over a die, slowly stretching them and manipulating them into a new structure.

DRM - Digital Rights Management - A term used to control andmanage access to copyrighted material that requires a plugin in order to access a publication.

DRUNKENNESS - An old term which has now been replaced by the politically correct term helix variation

DUCTILE - Material propertly, usually describing metal, which is not brittle and can be easly formed or bent. Clinching works in ductile material onlky.