TABLE I. Dash numbers and size. 1/ 2/
Dash number
Thread
Tubing
Thread
B
C
E
N
R
S
U
V
W
Brass
Corrosion
outside
T
+.047
+.047
+.047
+.047
±.015
SAE AS5201
±.015
±.015
±.015
resistant
diameter
AND10089
-.000
-.000
-.000
-.000
Rad
NPT
steel
2
C2
.125
.3125-32 UNEF-3A
.625
.500
.125
.312
.375
1/8-27
.625
.500
.375
3
C3
.188
.3750-24 UNF-3A
.156
.375
.656
.531
4
C4
.250
.4375-20 UNF-3A
.203
.438
.438
6
C6
.375
1/4 - 18
.6250-18 UNF-3A
.688
.750
.688
.750
.250
.500
.625
.562
8
C8
.500
3/8 - 18
.7500-16 UNF-3A
.812
.875
.750
.844
.312
.625
.750
10
C10
.625
1/2 - 14
.9375-14 NS-3
1.062
1.188
.938
1.062
.381
.750
.750
.938
TABLE I. Dash numbers and size Continued. 1/ 2/
Dash number
Thread
Tubing
Thread
B
C
E
N
R
S
U
V
W
Brass Corrosion
outside
T
+1.194
1.194-
+1.194
+1.194
±.381
SAE AS5201
±.381
±.381
±.381
resistant
diameter
AND10089
-.000
.000
-.000
-.000
Rad
NPT
steel
2
C2
3.175
7.925-32 NEF-3A
15.875
12.7
3.175
7.925
9.525
1/8-27
15.875
12.7
9.525
3
C3
4.267
9.525-24 UNF-3A
3.962
9.525
16.662
13.487
4
C4
6.350
11.125-20 UNF-3A
5.156
11.125
11.125
6
C6
9.525
1/4 - 18
15.875-18 UNF-3A
17.475
19.05
17.475
19.05
6.350
12.7
15.875
14.275
8
C8
12.700
3/8 - 18
19.050-16 UNF-3A
20.625
22.225
19.05
21.438
7.925
15.875
19.05
10
C10
15.875
1/2 - 14
23.825-14 NS-3
26.975
30.175
23.825
26.975
9.677
19.05
19.05
23.825
1/ Dimensions are in inches
2/ Metric equivalents are given for information only.