Friday, June 22, 2012

PULLEY TAP DIMENSIONS • GROUND THREAD


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
  1. L1 (Neck Length); neck and its length is optional with manufacturer
  2. 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.

No comments:

Post a Comment