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
Maximum external UNR minor diameter ( d 3 max ) = maximum external major diameter ( d max ) − double height of external UNR thread 2 h s
d d h 2 max s 3 = − max
h s = external UNR thread height,
. h P 2 1 19078493 1 19078493 0 02777778 0 033077362 0 033077 s # = = = = . . . .
External UNR thread height
2 h s is rounded to six decimal places
. . d d h 2 0 2960 0 033077 0 262923 0 2629 max max s 3 = − = − = = . .
Maximum external UNR minor diameter ( d 3 max ) Maximum external UN minor diameter ( d 1 max ) = maximum external major diameter ( d max ) − double height of external UN thread 2 h s
d 3 max is rounded to four decimal places
h 2
d d max 1
max # = −
For UN threads, 2 h
s =2 h n
s
. h P 2 1 08253175 1 08253175 0 02777778 0 030070329 0 030070 s # = = = = . . . .
For UN threads, 2 h s = 2 h n 2 h s is rounded to six decimal places
Double height of external UN thread 2 h s
. . d d h 2 0 2960 0 030070 0 265930 0 2659 max max s 1 = − = − = = . .
Maximum external UN minor diameter is rounded to four decimal places
Maximum external UN minor diameter ( d 1 max )
Table 6. Internal Inch Screw Thread Calculations for 19 ∕
64 -28 UNS-2B
Characteristic Description
Calculation
Notes
Minimum internal minor diameter ( D 1 min ) = basic major diameter ( D bsc ) − double height of external UN thread 2 h n
D D h 2 min bsc n 1 = −
2 h n is the double height of external UN threads
. 64 19 0 296875 0 2969 . =
This is the final value of basic major diameter (given) and rounded to four decimal places
bsc = =
Basic major diameter ( D bsc )
D
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