MIL-DTL-52525/31B
The operating pressure shall be as specified in table II. Maximum operating pressures are for low
carbon steel fittings consult manufacturer for values on other materials.
TABLE II. Maximum operating pressures of fittings. 1/ 2/
Maximum
SAE
operating
Hose ID
dash
pressure"
inches (mm)
size
psi
MPa
-12
.750 (19.05)
6250 43.1
-16
1.000- (25.40)
5000 34.5
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
Over tightening torque for the swivel nut shall be as specified in table III. Over tightening torque
values are for low carbon steel fittings consult manufacturer for values on other materials.
TABLE III. Over-tightening torque for swivel nut. 1/ 2/
SAE
Torque
Tube
dash
OD
Pound force
N-m
size
inches (mm)
foot(lbf-ft)
-12
.750 (19.05)
75
101.7
-16 1.000- (25.40)
100
135.6
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
PIN: The PIN consists of the letter "M" the specification sheet number, a dash, a number for the hose
size a dash, a number for tube size, and a material finish designator.
52525/31
-16
-16
A
M
Material/finish designator (see table II
Size dash number for tube (see figure 1)
Size dash number for hose (see figure 1)
Specification sheet number
M prefix
PIN example: M52525/31-16-16A, describes a 37° flare female swivel for a 1.00 inch (25.40 mm)
hose to 1.00 inch (25.40 mm) tube OD, aluminum with an anodized finish.
To the users of this document, it is recommended that the use of carbon steel material with cadmium
plating be used only when the other materials and finishes specified in this document cannot meet
performance requirements.
Color identification. Color identification shall be in accordance with SAE-AS4841.
Marking shall include the manufacturer's name or trademark, size, and hose identifier 100RE.
Location of marking is optional.
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