Table 4. Internal Inch Screw Thread Calculations for 1 ∕ Table 4. (Continued) Internal Inch Screw Thread Calculations for 1 ∕
2 -28 UNEF-2B
2 -28 UNEF-2B
Characteristic Description
Calculation
Notes
Minimum internal major diameter ( D min ) = basic major diameter ( D bsc )
. 05000
D D min
D min is rounded to four decimal places
bsc = =
Table 5. External Inch Screw Thread Calculations for 19 ∕
64 -36 UNS-2A
Characteristic Description
Calculation
Notes
. 64 19 0 296875 0 2969 . =
d bsc is rounded to four decimal places
Basic major diameter, d bsc
bsc = =
d
. P 36 1 0 0277777777778 0 02777778 = = = .
P is rounded to eight decimal places
Pitch, P
Maximum external major diameter ( d max ) = basic major diameter ( d bsc ) − allowance ( es )
d d es max bsc = −
Allowance ( es )
Td 2 is Pitch diameter tolerance for Class 2A
. es Td 0300 for Class 2A 2 # =
3 1
3 2
. 0 0015 0 0015 0015 0 0015 0 2969 0 0015 9 0 02777778 0 015 0 02777778 0 001000679 0 00075 0 001375803 0 003126482 0003127 2 . . . . . . . . . . . . . D LE P 3 1 # # = + + = = + + + + = = ^
Td
External pitch diameter tolerance, Td 2
3 2
LE = 9 P (length of engagement) Td 2 is rounded to six decimal places
h
. . es 0 300 0 003127 0 0009381 0 0009 # = = = . . . . d d es 0 2969 0 0009 0 2960 max bsc = − = − = .
Allowance ( es )
es is rounded to four decimal places d max is rounded to four decimal places
Maximum external major diameter ( d max )
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