One of the mysteries of the English language finally explained.
A steel plate with threaded holes for making male screws.
- ‘To make a bolt, a smith clamped the screw plate onto a rod of cold, soft iron and turned it down the rod.’
- ‘The resulting tap could then be used to make a matching screw plate.’
- ‘Presumably he used the screw plates to make steel taps for threading nuts as needed.’
- ‘The sharp, flat surfaces of the new thread departed from the more rounded ‘U’ shape of the old threads made with a two-piece screw plate.’
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