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Technical Information
Optional Neck and Shortened Thread Length Dimensions • Reference USCTI Table 302A
Blank Design 3
Blank Design 1
Blank Design 2
General Dimensions
Tap Dimensions — Inches
nominal
diameter range
(in)
machine
screw
size number
(in)
.104
.117
.130
.145
.171 .117
.130
.145
.171
.197 4
5
6
8
10 (.1120)
(.1250)
(.1380)
(.1640)
(.1900)
.197
.223
.260
.323
.395
.448
.510
.573
.635
.709
.760
.823
.885
.948 .223
.260
.323
.395
.448
.510
.573
.635
.709
.760
.823
.885
.948
1.010 12 (.2160)
—
—
—
—
—
—
nominal
metric
diameter
mm (in)
nominal
fractional
diameter (in)
overall
length L thread
length l
shank
neck
square diameter
length l1 length l2
D1
square
size A
—
M3
M3.5
M4
M4.5
M5 —
(.1181)
(.1378)
(.1575)
(.1772)
(.1969) 1
1
1
1
1
— 1.88
1.94
2.00
2.13
2.38
— .31
.31
.38
.38
.50
— .25
.31
.31
.38
.38
— .19
.19
.19
.25
.25
— .1410
.1410
.1410
.1680
.1940
— .110
.110
.110
.131
.152
—
—
M6
M7, M8
M10
—
M12
M14
M16
M18
—
M20
M22
M24
M25 —
(.2362)
(.2756), (.3150)
(.3937)
—
(.4724)
(.5541)
(.6299)
(.7087)
—
(.7874)
(.8661)
(.9449)
(.9843) 1
2
2
2
3
3
3
3
3
3
3
3
3
3 2.38
2.50
2.72
2.94
3.16
3.38
3.59
3.81
4.03
4.25
4.47
4.69
4.91
5.13 .50
.63
.69
.75
.88
.94
1.00
1.09
1.09
1.22
1.22
1.34
1.34
1.50 .44
.38
.44
.50
–
–
–
–
–
–
–
–
–
– .28
.31
.38
.44
.41
.44
.50
.56
.63
.69
.69
.75
.75
.81 .2200
.2550
.3180
.3810
.3230
.3670
.4290
.4800
.5420
.5900
.6520
.3670
.7600
.8000 .165
.191
.238
.286
.242
.275
.322
.360
.406
.442
.489
.523
.570
.600
—
—
—
—
—
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)
blank
design
number
Reprinted with permission from United States Cutting Tool Institute (USCTI). Published by Kennametal Inc. © 2014. All rights reserved.
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 specified, 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
length overall — L
length of thread — l
length of square — l2
diameter of shank — d1
size of square — a
nominal diameter
range (in) direction tolerance (in)
.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
plus or minus
plus or minus
plus or minus
plus or minus
plus or minus
plus or minus
plus or minus
minus .031
.063
.047
.063
.094
.125
.031
.063
.0015
.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
minus
minus
minus
minus
minus
minus
minus
minus .0015
.0020
.0020
.0030
.0030
.004
.006
.008
.010
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 Unified 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.
Reprinted with permission from United States Cutting Tool Institute (USCTI).
Published by Kennametal Inc. © 2014. All rights reserved.
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Special Taps