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This tap & die set was used for cutting or repairing screw threads on metal parts. It had a narrow application because the specifications of the thread sizes were unique to countries of the British Commonwealth-a critical fact during World War II (WWII) when all of the military hardware of Britain used this thread standard. Two Greenfield, Massachusetts companies-Greenfield Tap & Die (GTD) and Threadwell-were critical to the British war effort because they were suppliers of these tools during the war. The small town of Greenfield had a surprisingly large concentration of industries vital to the war effort, and employed an estimated 7,000 workers. Greenfield was even protected by an anti-aircraft battery, able to shoot down German bombers.


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Whitworth Hand Tap & Die set made by Greenfield Tap and Die Corporation during WWII

creator   Greenfield Tap and Die Corporation
date   1941-1945
location   Greenfield, Massachusetts
height   26.0"
width   15.0"
process/materials   metal
item type   Tools/Mechanical Tools & Equipment
accession #   #M.48

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See Also...

Go and No-Go Thread and Plug Gages made by Greenfield Tap and Die Corporation during WWII

Threadwell Tap and Die Company's Tap & Die set made in WWII

"GTD Makes John Grant's Invention Known Around World" article from Greenfield Recorder-Gazette newspaper

"America's Entire Strength Is Now Concentrated on Our War Effort" ad for GTD from Greenfield Recorder-Gazette newspaper

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