THREAD CALCULATION

BSW THREAD  :- (British standard whitworth thread )  
                                     British thread metric input in 'Inch' and angle is always 55 degree
                       given  1/2 BSW
                                  1/2 = 1 inch/2
                                        = 0.5"

 Calculate major diameter = 0.5 x 25.4
                                           = 12.7 mm

from thread data chart for minor diameter compair major diameter row = 9.99 mm


                                     TPI (Thread per inch ) = no. of thread
                                     TPI = 12     
      
                     Convert TPI into pitch = 25.4/12        ......................................(  1" = 25.4 mm)
                                                 Pitch = 2.1166 mm

           Thread depth = (major dia - minor dia) / 2
                                   =  (12.7-9.99) = 1.355 mm



METRIC THREAD :-
                                 In metric thread is always  given major  diameter and pitch
                             


                     EXAMPLE : M24X2 is given    

Major diameter is 24 
Pitch is 2 
Thread depth calculation = Pitch x 0.61363
                                       =  2 x 0.61363
                                               =  1.227         
Minor diameter =  20-1.22 = 22.78  mm                         

THREAD CALCULATION THREAD CALCULATION Reviewed by HARSHAL DHAWAS on July 21, 2018 Rating: 5
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