MIL-DTL-25995D
1.2.1 Classification.
1.2.1.1 Type. The type designators are as follows:
Type designator
Application
A
Structural pipe for non-pressure applications
B
Seamless pipe for pressure applications
Alloy/temper
Alloy/temper
designator code
1
3003-H18
2
3003-H112
3
6061-T6
4
6063-T6
1.2.3 Pipe size. The pipe size designators are as follows (see table I):
Nominal
Nominal
pipe size
pipe size
Nominal
Size
inches
inches
pipe size
designator
fraction
decimal 1/
(mm) 2/
A
1/8
.125
3.18
B
1/4
.250
6.35
C
3/8
.375
9.53
D
1/2
.500
12.70
E
3/4
.750
19.05
F
1
1.00
25.40
G
1 1/4
1.25
31.75
H
1 1/2
1.50
38.10
J
2
2.00
50.80
K
2 1/2
2.50
63.50
L
3
3.00
76.20
M
3 1/2
3.50
88.90
N
4
4.00
101.60
P
5
5.00
127.00
Q
6
6.00
152.40
R
8
8.00
203.20
S
10
10.00
254.00
T
12
12.00
304.80
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
2
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