spacer

(engineering) A piece of metal wire twisted at one end to form a guard to keep the explosive in a shothole in place and twisted at the other end to form a guard to hold the tamping in its place. A piece of wood doweling interposed between charges to extend the column of explosive. A device for holding two members at a given distance from each other. Also known as spacer block. The tapered section of a pug joining the barrel to the die; clay is compressed in this section before it issues through the die.

1. In glazing, one of the small blocks of wood or other material placed on both sides of the edges of glass, during its installation, to center it, to maintain uniform width of sealant beads, and to prevent excessive sealant distortion under lateral loading.
2. A device which holds steel reinforcement in its proper position, or which holds wall forms at a given distance apart before and during concreting.
3. See edge spacer.
4. See shim spacer.