diestock

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An apparatus for holding the dies that cut threads on screws, bolts, pipes, or rods.

from The Century Dictionary.

• noun A contrivance for holding the dies used in screw-cutting. It is made in various forms.

from the GNU version of the Collaborative International Dictionary of English.

• noun A stock to hold the dies used for cutting screws.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A component that holds a die that cuts screw threads

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a device that holds the dies that cut external threads on metal cylinders