MIL-DTL-3992F
1.2.1 Bulk hose or hose assembly.
A - Hose assembly.
B - Bulk hose.
1.2.2 Type, class, style. See table I for configurations available.
TABLE I. Type/class/style codes for PIN.
Type
Class
Style
Designator
(see 1.2.2.1)
(see 1.2.2.2)
(see 1.2.2.3)
01
I
1
02
I
2
03
I
3
04
I
4
05
II
A
06
II
B
1.2.2.1 Type. The types of brake hoses are as follows:
I - Air brake hose.
II - Vacuum brake hose.
a. Light wall vacuum brake hose: 7/32, 11/32, and 15/32 inch.
b. Heavy wall vacuum brake hose: 1/4, 3/8, 1/2, 5/8, 3/4, and 1 inch.
1.2.2.2 Class. Type I hose to be furnished in the following classes:
1 - Mandrel-built, reinforced with cotton or synthetic fiber yarn.
2 - Non-mandrel-built, reinforced with cotton or synthetic fiber yarn.
3 - Mandrel-built, reinforced with one braid of high tensile steel wire.
4 - Mandrel-built, reinforced with two cotton or synthetic fiber yarn braids separated by a high
tensile steel wire braid.
1.2.2.3 Style. Type II hose to be furnished in the following styles:
A - Heavy duty.
B - Light duty.
1.2.3 Inside diameter (ID). See table II for type I and table III for type II hose (see 1.2.2.1).
TABLE II. Type I inside diameters (ID).
ID designator
6
8
10
12
13
14
16
20
Inch/fraction
3/16
1/4
5/16
3/8
13/32
7/16
1/2
5/8
Inch/decimal
.188
.250
.313
.375
.406
.438
.500
.625
Metric (mm)
4.76
6.35
7.94
9.53
10.32
11.113
12.70
15.88
2
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