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Need the dimensional data for Buttress threads? Here's a great tool to calculate the numbers for your drawing.

BUTTRESS THREAD DATA

 
 
(for American National Standard 7 / 45 deg. flanks)
ref: ASME B1.9

INPUTS:
How to use this tool
D = Nominal Size (in)
n = No. of Threads per Inch
 
Class
2 (standard grade)
3 (precision grade)
 






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