PULLEY TAP DIMENSIONS • GROUND THREAD
(Ref. MCTI Table 310)
Nominal
|
Tap Dimensions - Inches
|
||||||
Fractional
|
Overall
|
Thread
|
Neck
|
Square
|
Length of Shank
|
Shank
|
Size of
|
Diameter
|
Length
|
Length
|
Length
|
Length
|
Close Tol. Section
|
Diameter
|
Sqaure
|
Inches
|
L
|
l
|
l1
|
l2
|
l4
|
d1
|
a
|
1/4 (.2500)
|
6 ,8
|
1.00
|
.38
|
.31
|
1.50
|
.2550
|
.191
|
5/16 (.3125)
|
6, 8
|
1.13
|
.38
|
.38
|
1.56
|
.3180
|
.238
|
3/8 (.3750)
|
6, 8,
10
|
1.25
|
.38
|
.44
|
1.63
|
.3810
|
.286
|
7/16 (.4375)
|
6, 8
|
1.44
|
.44
|
.50
|
1.69
|
.4440
|
.333
|
1/2 (.5000)
|
6, 8,
10, 12
|
1.66
|
.50
|
.56
|
1.69
|
.5070
|
.380
|
5/8 (.6250)
|
6, 8,
10, 12
|
1.81
|
.63
|
.69
|
2.00
|
.6330
|
.475
|
3/4 (.7500)
|
10,
12
|
2.00
|
.75
|
.75
|
2.25
|
.7590
|
.569
|
Tolerances
Element
|
Size Range
|
Direction
|
Tolerance
|
Overall
Length - L
|
1/4 to 3/4
inc.
|
Plus or Minus
|
.063
|
Thread Length
- l
|
1/4 to 3/4
inc.
|
Plus or Minus
|
.063
|
Neck Length -
l1
|
1/4 to 3/4
inc.
|
See Note - 1
|
See Note - 1
|
Square Length
- l2
|
1/4 to 3/4
inc.
|
Plus or Minus
|
.031
|
Length of
Shank (close tol) - l4
|
1/4 to 3/4
inc.
|
See Note - 2
|
See Note - 2
|
Shank
Diameter - d1
|
1/4 to 3/4
inc.
|
Minus
|
.0050
|
Square of
Shank - a
|
1/4 to 1/2
inc.
|
Minus
|
.004
|
5/8 to 3/4
inc.
|
Minus
|
.006
|
Notes
- L1 (Neck Length); neck and its length is optional
with manufacturer
- L4 (Length of Close Tolerance Shank) is minimum
length which is held to eccentricity tolerances per Table 317.
General Notes
a)
These taps have an internal center in the thread
end.
b)
These
taps are made to the H3 limits shown in Table 327)
c)
For
eccentricity tolerances of taps elements see table 317.
d)
d1 (Shank Diameter) is approximately the same as the maximum major
diameter for that size.
e)
a1 (Size or Square) is equal to .75 X d1 to the nearest .001 inch.
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