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Technical Information

Optional Neck and Shortened Thread Length Dimensions • Reference USCTI Table 302A

Blank Design 1

Blank Design 3

Blank Design 2

General Dimensions

Tap Dimensions — Inches

nominal

diameter range

(in)

machine

screw

size number

(in)

nominal

fractional

diameter (in)

nominal

metric

diameter

mm (in)

blank

shank

design overall thread neck square diameter square

number length L length l length l1 length l2 D1 size A

.104 .117

.117 .130

.130 .145

.145 .171

.171 .197

4 (.1120)

5 (.1250)

6 (.1380)

8 (.1640)

10 (.1900)

—

M3.5

M4.5

—

(.1181)

(.1378)

(.1575)

(.1772)

(.1969)

1 1.88 .31 .25 .19 .1410 .110

1 1.94 .31 .31 .19 .1410 .110

1 2.00 .38 .31 .19 .1410 .110

1 2.13 .38 .38 .25 .1680 .131

1 2.38 .50 .38 .25 .1940 .152

———————

.197 .223

.223 .260

.260 .323

.323 .395

.395 .448

.448 .510

.510 .573

.573 .635

.635 .709

.709 .760

.760 .823

.823 .885

.885 .948

.948 1.010

12 (.2160)

—

——

1/4 (.2500)

5/16 (.3125)

3/8 (.3750)

7/16 (.4375)

1/2 (.5000)

9/16 (.5625)

5/8 (.6250)

11/16 (.6875)

3/4 (.7500)

13/16 (.8125)

7/8 (.8750)

15/16 (.9375)

1 (1.0000)

—

M7, M8

M10

—

M12

M14

M16

M18

—

M20

M22

M24

M25

—

(.2362)

(.2756), (.3150)

(.3937)

—

(.4724)

(.5541)

(.6299)

(.7087)

—

(.7874)

(.8661)

(.9449)

(.9843)

2.38 .50

2.50 .63

2.72 .69

2.94 .75

3.16 .88

3.38 .94

3.59 1.00

3.81 1.09

4.03 1.09

4.25 1.22

4.47 1.22

4.69 1.34

4.91 1.34

5.13 1.50

.44

.38

.44

.50

–

.28 .2200 .165

.31 .2550 .191

.38 .3180 .238

.44 .3810 .286

.41 .3230 .242

.44 .3670 .275

.50 .4290 .322

.56 .4800 .360

.63 .5420 .406

.69 .5900 .442

.69 .6520 .489

.75 .3670 .523

.75 .7600 .570

.81 .8000 .600

NOTE: Thread length l is based on a length of 12 pitches of the UNC thread series. Thread length “l” is a minimum value and has no tolerance.

When thread length “l” is added to neck length “l1”, the total shall be no less than the minimum USCTI Table 302 thread length “l”.

Unless otherwise specied, all tolerances are in accordance with USCTI Table 302. For eccentricity tolerances, see USCTI Table 317.

Table 302 is provided for reference only. WIDIA-GTD™ tap dimensions may differ.

Tolerances

element

nominal diameter

range (in)

direction tolerance (in)

length overall — L

length of thread — l

length of square — l2

diameter of shank — d1

.0520–1.0100

1.0100–4.0100

.0520–.2230

.2230–.5100

.5100–1.5100

1.5100–4.0100

.0520–1.0100

1.0100–4.0100

.0520–.2230

plus or minus

minus

.031

.063

.047

.063

.094

.125

.031

.063

.0015

size of square — a

.2230–.6350

.6350–1.0100

1.0100–1.5100

1.5100–2.0100

2.0100–4.0100

.0520–.5100

.5100–1.0100

1.0100–2.0100

2.0100–4.0100

minus

.0015

.0020

.0030

.004

.006

.008

.010

Reprinted with permission from United States Cutting Tool Institute (USCTI).

Special Taps

Unless otherwise specified:

Special taps over 1.010–1.510" diameter inclusive, having 14 or more

threads per inch or 1,75mm pitch and finer, and sizes over 1.510"

diameter with 10 or more threads per inch or 2,5mm pitch and finer,

are made to general dimensions shown in USCTI Table 303.

Special tap thread limits are determined using the formulas shown

in USCTI Table 331 for Unified Inch Screw Threads and USCTI

Table 341 for metric m-profile screw threads.

NOTE:

Tap sizes .395" and smaller have an external centre on the thread end

(may be removed on bottoming taps). Sizes .125" and smaller have an

external centre on the shank end. Sizes .224–.395" have truncated partial

cone centres on the shank end (length of cone approximately 1/4 of

diameter of shank). Sizes over .395" have internal centres on both the

thread and shank ends.

For standard thread limits and tolerances for Unied Inch Screw Threads, see

USCTI Table 327, and for metric threads, see USCTI Table 337.

For eccentricity tolerances of tap elements, see USCTI Table 317.

Y91

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