Assemblies
311
Dash #
Hose ID
(
Except SAE 100R5)
SAE Dash Size*
(
SAE 100R5)
in.
mm
in.
mm
-2
1/8
3.2
-3
3/16 4.8
-4
1/4
6.4
3/16 4.8
-5
5/16 7.9
1/4
6.4
-6
3/8
9.5
5/16 7.9
-8
1/2
12.7
13/32 10.3
-10
5/8
15.9
1/2
12.7
-12
3/4
19.0
5/8
15.9
-14
7/8
22.2
-16
1
25.4
7/8
22.2
-20
1
e
31.8
1
a
28.6
-24
1
f
38.1
1
b
35.0
-32
2 50.8
1
n
46.0
-36
2
e
57.6
-40
2
f
63.5
2
b
60.3
-48
3
76.2
-56
3
f
88.9
-64
4
101.6
-72
4
f
115.2
*
SAE Dash Size equals OD of the tubing, which has approximately the same ID as the hose,
expressed in 1/16”.
Defining Hose and Assembly Length
Identifying Hose ID
In the case of a hose assembly replacement, the inside
diameter (ID) of the hose can be obtained from the existing
assembly. The ID may be printed on the layline of the
hose or may have to be measured. Before cutting the
assembly, measure the overall assembly length and record
the orientation of the fittings. See the following sections
on how to measure overall assembly length and the
offset angle between the two fittings. If the ID of the hose
has not been determined, utilize the Hose ID Selection
Nomograph in the Appendix. The chart will yield a hose ID
recommendation based on flow capacity and flow velocity.
Hydraulic hose size or inside diameter is sometimes
referred to as the “Dash Size.” The Dash number is the ID
of the hose in sixteenths of an inch. For example, a 1/4” ID
hose, is equivalent to 4/16”. The “Dash Size” would be “-4.”
A listing of the Dash sizes is shown below. Note that the
Dash number applies to the hose ID for all hoses except
SAE 100R5. In the case of SAE 100R5, the Dash number is
equal to a relevant tube outside diameter (O.D.).
Identifying Overall Assembly Length
Unless otherwise specified by the customer, the assembly’s
overall length is measured from the extreme end of one
fitting to the extreme end of the other except for the O-ring
face seal fittings, which shall be measured from the sealing
face. Where elbow fittings are used, measurement shall be
to the centerline of the sealing surface of the elbow end.
Assembly Length Measurements
Overall Assembly Length
Female Swivel Ends (except O-ring Face Seal)
Measure to sealing surface.
Male Ends
L
Bent Stem Swivel Female Ends
L
Flange Ends
Swivel O-Ring Face Seal Ends
Measure to seat face.
L
L
Appendix
Installation & Maintenance
Assemblies
Equipment & Accessories
Fittings
Hoses