MIL-DTL-13531J
3.4.2 Inner tube. The inner tube shall consist of an oil-resistant compound seamless and uniform
gauge. The inner tube shall have a smooth bore, shall be free of pitting and other defects and shall be
cleaned free of dirt, foreign material and mandrel lubricants.
3.4.3 Outer cover. The outer cover shall be a synthetic rubber compound capable of meeting the
performance requirements of this specification.
3.4.4 Hose diameters. Inside diameter and outside diameter of the hose and outside diameter of the wire
braid shall be as specified in table I for the specified nominal hose size.
TABLE I. Hose dimensions. 1/ 2/
Nominal
Wire braid outside diameter
Nominal
Inside
hose
hose
Hose size
diameter
Type I
Types II and III
size
size
dash
classes A and B
classes A and B
classes A and B
inches
number
inch
inches
inches
inches
decimal
fraction
(mm)
(mm)
(mm)
(mm)
0.375 ± .023
0.438 ± .023
3
3/16
.188
0.188+.023 -.008
(4.78)
(4.78 +0.58 - 0.20)
(9.53 ± 0.58)
(11.13 ± 0.58)
0.438 ±. 023
0.500 ± .023
4
1/4
.250
0.250+.023 -.008
(6.35)
(6.35 +0.58 - 0.20)
(11.13 ± 0.58)
(12.70 ± 0.58)
0.500 ± .023
0.563 ± .023
5
5/16
.313
0.313+.023 -.008
(7.95)
(7.95 +0.58 - 0.20)
(12.70 ± 0.58)
(14.30 ± 0.58)
0.594 ± .023
0.656 ± .023
6
3/8
.375
0.375+.023 -.008
(9.53)
(9.53 +0.58 - 0.20)
(15.09 ± 0.58)
(16.66 ± 0.58)
0.719 ± .031
0.781 ± .031
8
1/2
.500
0.500+.031 -.015
(12.70)
(12.70 +0.79 - 0.38)
(18.26 ± 0.79)
(19.84 ± 0.79)
0.844 ± .031
0.906 ± .031
10
5/8
.625
0.625+.031 -.015
(15.88)
(15.88 +0.79 - 0.38)
(21.44 ± 0.79)
(23.01 ± .079)
1.000 ±.031
1.063 ± .031
12
3/4
.750
0.750+.031 -.015
(27.00 ± .079)
(19.05)
(19.05 +.079 -0.38)
(25.40 ± 0.58)
1.125 ±. 031
1.188 ± .031
14
7/8
.875
0.875+.031 -.015
(30.18 ± .079)
(22.23)
(22.23 +.031 -.015)
(28.58 ± 0.79)
1.313 ± .031
1.375 ± .047
16
1
1.000
1.000+.040 -.015
(34.93 ± 1.19)
(25.40)
(25.40 +1.02 - 0.38)
(33.35 ± 0.79)
1.594 ± .047
1.750 ± .047
1.250
1-1/4
20
1.250+.047 -.015
(44.45 ± 1.19)
(31.75)
(31.75 +1.19 -0.38)
(40.49 ± 1.19)
1.844 ± .047
2.000 ± .047
1.5
1-1/2
24
1.500+.047 -.015
(50.80 ± 1.19)
(38.10)
(38.10 +1.19 -0.38)
(46.84 ± 1.19)
2.375 ± .047
2.500 ± .047
2.000
2
2.000+.047 -.015
32
(63.50 ± 1.19)
(50.80)
(50.80 +1.19 -0.38)
(60.33 ± 1.19)
See notes at end of table.
7
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