TABLE I. Dash numbers and size. 1/ 2/
Dash number
Weight Max
K
A
E
Thread
N
Tubing
H
Q
+.005
Brass Corrosion
Brass Corrosion
±.015
B
±.015
T
±.010
outside
Reference
Diameter
-.002
resistant
resistant
Diameter
AND10089
diameter
Diameter
steel
steel
2
C2
.125
.3125-32 UNEF-3A
.750
.312
.125
.219
.375
.51
.438
3
C3
.188
.3750-24 UNF-3A
.938
.375
.191
.281
.438
.51
±.003
4
C4
.250
.4375-20 UNF-3A
1.000
.500
.375
.257
.344
.500
.65
5
C5
.312
.5000-20 UNF-3A
1.188
.625
.500
.323
.406
.562
.72
6
C6
.375
.6250-18 UNF-3A
1.250
.750
.500
.386
.469
.625
.87
±.004
8
C8
.500
.7500-16 UNF-3A
1.625
.875
.750
.516
.609
.875
1.01
10
C10
.625
.9375-14 NS-3
1.688
1.000
.750
.641
.719
.875
1.09
TABLE I. Dash numbers and size Continued. 1/ 2/
Dash number
Weight Max
K
N
A
E
Thread
Tubing
Q
H
+.127
Brass Corrosion
Brass
Corrosion
±.254
±..381
B
±.381
T
outside
Reference
Diameter
-.051
resistant
resistant
Diameter
AND10089
diameter
Diameter
steel
steel
2
C2
3.175
.3125-32 UNEF-3A
20.625
7.925
3.175
5.563
9.525
12.954
11.125
±..0762
3
C3
4.267
.3750-24 UNF-3A
23.825
9.525
4.851
7.137
11.125
12.954
4
C4
6.350
.4375-20 UNF-3A
25.400
14.275
9.525
6.528
8.738
12.7
16.510
5
C5
7.925
.5000-20 UNF-3A
26.975
15.875
12.70
8.204
10.312
14.275
18.288
6
C6
9.525
.6250-18 UNF-3A
33.325
19.050
12.70
9.804
11.913
15.875
22.098
±.1016
8
C8
12.700
.7500-16 UNF-3A
38.100
22.225
19.05
13.106
15.469
22.225
25.654
10
C10
15.875
.9375-14 NS-3
44.450
23.825
19.05
16.281
18.263
22.225
27.686
1/ Dimensions are in inches
2/ Metric equivalents are given for information only.