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Technical Information
Standard Pipe Tap Dimensions • Straight and Taper • Ground Thread • Reference USCTI Table 311
„ 
General Dimensions
„ 
Tolerances
dimensions (in)
element
nominal
size
(in) overall
length
L thread
length
l square
length
l2 shank
diameter
D1 square
size
A optional
neck
length
l1
1/16
1/8
1/8
1/4
3/8
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4 2.13
2.13
2.13
2.44
2.56
3.13
3.25
3.75
4.00
4.25
4.25
5.50
6.00
6.50
6.75 .69
.75
.75
1.06
1.06
1.38
1.38
1.75
1.75
1.75
1.75
2.56
2.63
2.69
2.75 .38
.38
.38
.44
.50
.63
.69
.81
.94
1.00
1.13
1.25
1.38
1.50
1.56 .3125
.3125
.4375
.5625
.7000
.6875
.9063
1.1250
1.3125
1.5000
1.8750
2.2500
2.6250
2.8125
3.0000 .234
.234
.328
.421
.531
.515
.679
.843
.984
1.125
1.406
1.687
1.968
2.108
2.250 .375
–
.375
.375
.375
–
–
–
–
–
–
–
–
–
–
length overall — L
length of thread — l
length of square — l2
diameter of shank — d1
size of square — a
range direction tolerance
1/16–3/4 inc.
1–4 inc.
1/16–3/4 inc.
1–1-1/4 inc.
1-1/2–4
1/16–3/4 inc.
1–4 inc.
1/16–1/8
1/4–1 inc.
1-1/4–4 inc.
1/16–1/8
1/4–3/4 inc.
1–4 inc. plus/minus
plus/minus
plus/minus
plus/minus
plus/minus
plus/minus
plus/minus
minus
minus
minus
minus
minus
minus .031
.063
.063
.094
.125
.031
.063
.0015
.0020
.0030
.004
.006
.008
Y92
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