Table 5. External Inch Screw Thread Calculations for 19 ∕ Table 5. (Continued) External Inch Screw Thread Calculations for 19 ∕
64 -36 UNS-2A
64 -36 UNS-2A
Characteristic Description
Calculation
Notes
Minimum external major diameter ( d min ) = maximum external major diameter ( d max ) − major diameter tolerance ( Td )
d d Td min max = −
Td is the major diameter tolerance
. Td P 0060 0 060 0 02777778 3 2 2 3 # = = . . . . . . 0 060 0 000772 0 060 0 091736 0 00550416 0 0055 3 # # = = = = . . . . d d Td 0 2960 0 0055 0 2905 min max = − = − = .
Td is rounded to four decimal places
Major diameter tolerance ( Td )
Minimum external major diameter ( d min ) Maximum external pitch diameter ( d 2 max ) = maximum external major diameter ( d max ) − twice the external thread addendum
d min is rounded to four decimal places
h 2
d d max 2
h as = external thread addendum
max # = −
as
. 2 064951905 2 0 64951905 2 0 64951905 0 02777778 0 0180421972 0018042 as as as # = = = = = . . . . . h h P h P
h as is rounded to six decimal places
External thread addendum
. . d d h 2 0 2960 0 018042 0 277958 0 2780 max max as 2 = − = − = = . .
Maximum external pitch diameter ( d 2 max ) Minimum external pitch diameter ( d 2 min ) = maximum external pitch diameter ( d 2 max ) − external pitch diameter tolerance ( Td 2 ) Minimum external pitch diameter ( d 2 min )
d 2 max is rounded to four decimal places
Td 2 = external pitch diameter tolerance (see previous Td 2 calculation in this table)
d d Td min max 2 2 2 = −
. . d d Td 0 2780 0 003127 0 274873 0 2749 min max 2 2 2 = − = − = = . .
d 2 min is rounded to four decimal places
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