Lew Merrick has put together more information about threads than you ever thought you wanted to know.
Where did threads come from? Who invented them? How did they develop?
All the details of Acme threads.
How large a hole should you drill before tapping?
All the details of Stub Acme threads.
All the details of Unified National threads.
Additions or changes?
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Machinist's Calculatorlmscnc.com/calc
Height Gage, 6", Digital, iGaging
