MIL-DTL-52525/2C
Maximum 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/
SAE dash
Hose ID
psi
MPa
size
inches (mm)
-4
.250 (6.35)
4500
31
-6
.375 (9.53)
4000
27.5
-8
.500 (12.70)
4000
27.5
-12
.750 (19.05)
3000
21
-16
1.000 (25.40)
2500
17
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
Over tightening torque 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/ 3/
Torque
SAE dash
Hose ID ref
Pound-force
size
inches (mm)
inches
Nm
(lb-in)
-4
.250 (6.35)
135
15
-5
.313 (7.95)
180
20
-6
.375 (9.53)
270
31
-8
.500 (12.70)
450
51
-10
.625 (15.88)
650
73
-12
.750 (19.05)
900
102
-16
1.000 (25.40)
1200
136
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, a number for hose
size, a dash, a number for tube size, and a material finish designator.
M
52525/2
-4
-5
A
Material/finish designator (see table I)
Size dash number for tube (see figure 1)
Size dash number for hose (see figure 1)
Specification sheet number
M prefix
PIN example: M52525/2-4-5A, describes a 45° connector for a .250 inch hose ID, for a .313 inch
tube OD, aluminum with an anodize finish.
5