MIL-DTL-52525/6C
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/
Hose ID
SAE dash
psi
MPa
size
inches (mm)
31
-4
.250 (6.35)
4500
27.5
-5
.313 (7.95)
4000
27.5
-6
.375 (9.53)
4000
27.5
-8
.500 (12.70)
4000
21
-10
.625 (15.88)
3000
21
-12
.750 (19.05)
3000
17
-16
1.000 (25.40)
2500
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
SAE dash
Hose ID ref
Pound-force
inches (mm)
size
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.
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
52525/6
-8
-10
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: M52525/6-8-10A, describes a 45° connector for a .500 Inches (12.70 mm) hose, and
with .625 Inches (15.88 mm) tube, aluminum with an anodized finish.
5