MIL-DTL-52525/9C
Maximum operating pressure shall be as specified in table III. Maximum operating pressures are for
low carbon steel fittings consult manufacturer for values on other materials.
TABLE III. Maximum operating pressures of fittings. 1/ 2/ 3/
SAE
Hose ID ref
psi
MPa
dash size
inches (mm)
-12
.750 (19.05)
5000
34.5
-16
1.000 (25.40)
4000
27.6
-20
1.250 (31.75)
3000
20.7
-24
1.500 (38.10)
2500
17.2
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
3/ Source SAE-J517.
Over tightening torque shall be as specified in table IV. Over tightening torque values are for low
carbon steel fittings consult manufacturer for values on other materials.
TABLE IV. Over-tightening torque for swivel nut. 1/ 2/ 3/
Torque
SAE
Hose ID ref
Pound-force foot
dash size
inches (mm)
Nm
(lbf-ft)
-12
.750 (19.05)
75
102
-16
1.000 (25.40)
100
136
-20
1.250 (31.75)
158
214
-24
1.500 (38.10)
225
305
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
3/ Test torques are for low carbon steel fittings. Consult
manufacturer for values for other materials.
PIN: The PIN consists of the letter "M" the specification sheet number, a dash number for hose size,
a dash a number for tube size, and a material finish designator.
M
52525/9
-20
-20
A
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: M52525/9-20-20A, describes a connector for a 1.250 inch (31.75 mm) hose with a
1.250 inch (31.75 mm) tube, 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.
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