MIL-DTL-52525/8C
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
Hose ID
psi
MPa
dash size
inches (mm)
-4
.250 (6.35)
2750
19.0
-5
.313 (7.95)
2500
17.2
-6
.375 (9.53)
2250
15.5
-8
.500 (12.70)
2000
13.8
-10
.625 (15.88)
1500
10.3
-12
.750 (19.05)
1250
8.6
-16
1.000 (25.40)
1000
6.9
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/
Torque
Hose ID ref
SAE dash
Pound-force inch
inches (mm)
size
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.
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
52525/8
-4
-5
A
Material/finish designator (see table I)
Size dash number for tube (see figure I)
Size dash number for hose (see figure I)
Specification sheet number
M prefix
PIN example: M52525/8-4-5A, describes a 90° connector for a .250 inch (6.35 mm) hose OD, .313
inch (7.95 mm) tube OD, aluminum with an anodized finish.
5