ISO 7368:2025

International
Standard
ISO 7368
Third edition
Hydraulic fluid power — Two-port
2025-07
slip-in cartridge valves — Cavities
Transmissions hydrauliques — Distributeurs à cartouche, à bride,
à deux orifices — Logements
Reference number
© ISO 2025
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Tolerances . 2
6 Dimensions . 2
7 Identification statement (reference of this document) . 3
Bibliography .36

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 5,
Control products and components.
This third edition cancels and replaces the second edition (ISO 7368:2016), which has been technically
revised.
The main changes are as follows:
— codification adapted to ISO 5783:2019, Clause 6 and all figure and table titles;
— introduction of new reference B on the manifold surface and perpendicularity to diameter d (all figures);
— the runout tolerance of diameter d additionally refers primarily to datum B. This is to avoid measuring
errors due to the short measuring distance of diameter d for determining the datum axis;
— R introduced at the face side (inner corner) of outside diameter d for all sizes (all figures);
2 2
— the tolerance of depth Z in Table 6 has been changed similar to Table 5 to ±0,2 mm;
— “NOTE Size 15 and size 16 are not yet listed in ISO 5783” in Clause 4 was deleted, because these sizes
were included in ISO 5783-2019.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure
within an enclosed circuit. Typical components found in such systems are hydraulic valves. These devices
control flow direction, pressure or flow rate of liquids in the enclosed circuit.

v
International Standard ISO 7368:2025(en)
Hydraulic fluid power — Two-port slip-in cartridge valves —
Cavities
1 Scope
This document specifies only geometrical data relating to cavities in which two-port hydraulic slip-in
cartridge valves are mounted in order to ensure interchangeability.
NOTE For example, this document does not specify rated pressures.
It applies to cavities for two-port hydraulic slip-in cartridge valves which are generally applicable to
industrial equipment.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 3601-2, Fluid power systems — O-rings — Part 2: Housing dimensions for general applications
ISO 5598, Fluid power systems and components — Vocabulary
ISO 21920-1, Geometrical product specifications (GPS) — Surface texture: Profile — Part 1: Indication of
surface texture
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Symbols
a) A, B, X, Y, Z and Z identify ports the operational usage of which, in some cases, may be different from
1 2
that given in the following examples:
1) A: inlet, service, return corresponding to the placing in the hydraulic circuit;
2) B: inlet, service, return corresponding to the placing in the hydraulic circuit;
3) X: pilot, inlet;
4) Y: pilot, return;
5) Z : supplementary pilot, inlet;
6) Z : supplementary pilot, return;
b) F … F identify threaded holes for fixing screws;
1 12
c) G, G and G identify the location of pin holes;
1 2
d) D identifies the fixing screw diameter;
e) r identifies the mounting surface edge radius;
max
f) R indicates the maximum radius at the bottom of d ;
1 1
g) R indicates the maximum radius at the bottom of d .
2 2
The code system used in this document is defined in ISO 5783.
5 Tolerances
The following requirements shall be applied to the sealing and chamfer surfaces, i.e. that area within the
chain lines:
— surface roughness, Rz, as indicated on the figures in accordance with ISO 21920-1;
— all non-specified surface finishes: Rz 63;
— surface roughness values are given in micrometres (µm);
— surface flatness: 0,01 mm over a distance of 100 mm as specified in ISO 3601-2.
The following tolerances shall be complied with along the X, Y and Z axes with respect to the origin:
— pin holes: ±0,2 mm;
— screw holes: ±0,2 mm;
— port holes: ±0,2 mm;
— general tolerances in accordance with ISO 2768-1, ISO 2768-m for linear and angular dimensions without
tolerances.
As for other dimensions, see Figure 1 to Figure 16.
6 Dimensions
6.1 Cavity dimensions for hydraulic slip-in cartridge valves with two main ports shall be selected from
Figure 1 to Figure 16 and Table 1 to Table 16 as specified in 6.2 to 6.17.
6.2 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 16 mm nominal diameter (size 06) (code: 7368 - 06 - 01 - 1 - 25) are specified in Table 1 and shown in
Figure 1.
6.3 Cavity dimensions for main system pressure-relief valves with main ports of 16 mm nominal diameter
(size 06) (code: 7368 - 06 - 02 - 1 - 25) are specified in Table 2 and shown in Figure 2.
6.4 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 25 mm nominal diameter (size 08) (code: 7368 - 08 - 03 - 1 - 25) are specified in Table 3 and shown in
Figure 3.
6.5 Cavity dimensions for main system pressure-relief valves with main ports of 25 mm nominal diameter
(size 08) (code: 7368 - 08 - 04 - 1 - 25) are specified in Table 4 and shown in Figure 4.

6.6 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 32 mm nominal diameter (size 09) (code: 7368 - 09 - 05 - 1 - 25) are specified in Table 5 and shown in
Figure 5.
6.7 Cavity dimensions for main system pressure-relief valves with main ports of 32 mm nominal diameter
(size 09) (code: 7368 - 09 - 06 - 1 - 25) are specified in Table 6 and shown in Figure 6.
6.8 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 40 mm nominal diameter (size 10) (code: 7368 - 10 - 07 - 1 - 25) are specified in Table 7 and shown in
Figure 7.
6.9 Cavity dimensions for main system pressure-relief valves with main ports of 40 mm nominal diameter
(size 10) (code: 7368 - 10 - 08 - 1 - 25) are specified in Table 8 and shown in Figure 8.
6.10 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 50 mm nominal diameter (size 11) (code: 7368 - 11 - 09 - 1 - 25) are specified in Table 9 and shown in
Figure 9.
6.11 Cavity dimensions for main system pressure-relief valves with main ports of 50 mm nominal diameter
(size 11) (code: 7368 - 11 - 10 - 1 - 25) are specified in Table 10 and shown in Figure 10.
6.12 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 63 mm nominal diameter (size 12) (code: 7368 - 12 - 11 - 1 - 25) are specified in Table 11 and shown in
Figure 11.
6.13 Cavity dimensions for main system pressure-relief valves with main ports of 63 mm nominal diameter
(size 12) (code: 7368 - 12 - 12 - 1 - 25) are specified in Table 12 and shown in Figure 12.
6.14 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 80 mm nominal diameter (size 13) (code: 7368 - 13 - 13 - 1 - 25) are specified in Table 13 and shown in
Figure 13.
6.15 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 100 mm nominal diameter (size 14) (code: 7368 - 14 - 14 - 1 - 25) are specified in Table 14 and shown in
Figure 14.
6.16 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 125 mm nominal diameter (size 15) (code: 7368 - 15 - 15 - 1 - 25) are specified in Table 15 and shown in
Figure 15.
6.17 Cavity dimensions for all types of valves, except main system pressure-relief valves, with main ports
of 160 mm nominal diameter (size 16) (code: 7368 - 16 - 16 - 1 - 25) are specified in Table 16 and shown in
Figure 16.
7 Identification statement (reference of this document)
Use the following statement in test reports, catalogues and sales literature when electing to conform with
this document:
"Cavity dimensions conform to ISO 7368, Hydraulic fluid power — Two-port slip-in cartridge valves — Cavities.”

Dimensions and geometrical tolerances in millimetres

a
The dimension specifying the area within the chain lines is the minimum dimension for mounting the cartridge
valve cover. The corners of the square may be rounded to a maximum radius, r , equal to the thread diameter of
max
the fixing screws. Along each axis, the fixing holes are at equal distances to the valve cover mounting surface edges.
b
Pilot valves and adjustment devices may exceed this dimension.
c
This dimension gives the minimum space required for a two-port hydraulic slip-in cartridge valve and its cover with
this cavity. The dimension is also the minimum distance from centreline to centreline of two identical cavities on a
manifold. The valve manufacturer’s attention is drawn to the fact that no part of the complete valve assembly shall
exceed this dimension.
d
No burrs permitted in this area; the edges shall be rounded.
e
Visual examination.
f
Minimum length over which the specified surface finish shall apply.
Figure 1 — Cavity for two-port hydraulic slip-in cartridge valves of all types, except main system
pressure-relief valves, with main ports of 16 mm nominal diameter (size 06) and square flange
cover (code: 7368 - 06 - 01 - 1 - 25)

Table 1 — Cavity for two-port hydraulic slip-in cartridge valves of all types, except
main system pressure-relief valves, with main ports of 16 mm nominal diameter (size 06)
and square flange cover
Dimensions in millimetres
e e c b,c c c c c a a a a d,e
d d d d X Y Z Z F F F F G R R
1 2 3 4 1 2 1 2 3 4 1 2
Axis
ø 32 ø 25 ø 16 ø 4 ø 4 ø 4 ø 4 ø 4 R2 R1
ø 16 M8 M8 M8 M8
H7 H7 max. max. max. max. max. H13 max. max.
X 23 23 23 — −2 48 23 23 0 46 46 0 12,5 — —
Y 23 23 23 — 23 23 −2 48 0 0 46 46 0 — —
Z 43 ± 0,2 56 + 0,1 — — — — — — — — — — 8 min. — —
a
The minimum thread depth is 1,8 times the screw diameter, D. The recommended full thread depth is 2D + 6 mm to
facilitate interchangeability of valves and to reduce the number of fixing screw lengths. However, sufficient distance from
fixing hole to port B shall be respected. The recommended engagement of fixing screw thread for ferrous mounting is
1,25D.
b
Suggested diameter of port B, but may be of any size located within the space between the dimensions indicated as
20 mm and 42,5 mm; port B is not necessarily machined and may be provided by casting.
c
The depth and angle of the pilot ports and the main ports are determined by the graphical layout of the hydraulic
circuit and by the location of the valves in the manifold.
d
Blind hole to accommodate the locating pin on the valve cover.
e
The depth of d , d and G are given in the tables as dimension Z.
1 2
Dimensions and geometrical tolerances in millimetres

a
The dimension specifying the area within the chain lines is the minimum dimension for mounting the cartridge
valve cover. The corners of the square may be rounded to a maximum radius, r , equal to the thread diameter of
max
the fixing screws. Along each axis, the fixing holes are at equal distances to the valve cover mounting surface edges.
b
Pilot valves and adjustment devices may exceed this dimension.
c
This dimension gives the minimum space required for a two-port hydraulic slip-in cartridge valve and its cover with
this cavity. The dimension is also the minimum distance from centreline to centreline of two identical cavities on a
manifold. The valve manufacturer’s attention is drawn to the fact that no part of the complete valve assembly shall
exceed this dimension.
d
No burrs permitted in this area; the edges shall be rounded.
e
Visual examination.
f
Minimum length over which the specified surface finish shall apply.
Figure 2 — Cavity for two-port hydraulic slip-in cartridge main system pressure-relief
valves with main ports of 16 mm nominal diameter (size 06) and square flange cover
(code: 7368 - 06 - 02 - 1 - 25)

Table 2 — Cavity for two-port hydraulic slip-in cartridge main system pressure-relief valves with
main ports of 16 mm nominal diameter (size 06) and square flange cover
Dimensions in millimetres
e e c b,c c c c c a a a a d,e
d d d d X Y Z Z F F F F G R R
1 2 3 4 1 2 1 2 3 4 1 2
Axis
ø 32 ø 25 ø 16 ø 4 ø 4 ø 4 ø 4 ø 4 R2 R1
ø 16 M8 M8 M8 M8
H7 H7 max. max. max. max. max. H13 max. max.
X 23 23 23 — −2 48 23 23 0 46 46 0 46 — —
Y 23 23 23 — 23 23 −2 48 0 0 46 46 33,5 — —
Z 43 ± 0,2 56 + 0,1 — — — — — — — — — — 8 min. — —
a
The minimum thread depth is 1,8 times the screw diameter, D. The recommended full thread depth is 2D + 6 mm to facilitate
interchangeability of valves and to reduce the number of fixing screw lengths. However, sufficient distance from fixing hole to
port B shall be respected. The recommended engagement of fixing screw thread for ferrous mounting is 1,25D.
b
Suggested diameter of port B, but may be of any size located within the space between the dimensions indicated as 20 mm
and 42,5 mm; port B is not necessarily machined and may be provided by casting.
c
The depth and angle of the pilot ports and the main ports are determined by the graphical layout of the hydraulic circuit and
by the location of the valves in the manifold.
d
Blind hole to accommodate the locating pin on the valve cover.
e
The depth of d , d and G are given in the tables as dimension Z.
1 2
Dimensions and geometrical tolerances in millimetres

a
The dimension specifying the area within the chain lines is the minimum dimension for mounting the cartridge
valve cover. The corners of the square may be rounded to a maximum radius, r , equal to the thread diameter of
max
the fixing screws. Along each axis, the fixing holes are at equal distances to the valve cover mounting surface edges.
b
Pilot valves and adjustment devices may exceed this dimension.
c
This dimension gives the minimum space required for a two-port hydraulic slip-in cartridge valve and its cover with
this cavity. The dimension is also the minimum distance from centreline to centreline of two identical cavities on a
manifold. The valve manufacturer’s attention is drawn to the fact that no part of the complete valve assembly shall
exceed this dimension.
d
No burrs permitted in this area; the edges shall be rounded.
e
Visual examination.
f
Minimum length over which the specified surface finish shall apply.
Figure 3 — Cavity for two-port hydraulic slip-in cartridge valves of all types, except main system
pressure-relief valves, with main ports of 25 mm nominal diameter (size 08) and square flange
cover (code: 7368 - 08 - 03 - 1 - 25)

Table 3 — Cavity for two-port hydraulic slip-in cartridge valves of all types, except
main system pressure-relief valves, with main ports of 25 mm nominal diameter (size 08)
and square flange cover
Dimensions in millimetres
e e c b,c c c c c a a a a d,e
d d d d X Y Z Z F F F F G R R
1 2 3 4 1 2 1 2 3 4 1 2
Axis
ø 45 ø 34 ø 25 ø 6 ø 6 ø 6 ø 6 ø 6 R2 R1
ø 25 M12 M12 M12 M12
H7 H7 max. max. max. max. max. H13 max. max.
X 29 29 29 — −4 62 29 29 0 58 58 0 13 — —
Y 29 29 29 — 29 29 −4 62 0 0 58 58 0 — —
Z 58 ± 0,2 72 + 0,1 — — — — — — — — — — 8 min. — —
a
The minimum thread depth is 1,8 times the screw diameter, D. The recommended full thread depth is 2D +6 mm to facilitate
interchangeability of valves and to reduce the number of fixing screw lengths. However, sufficient distance from fixing hole to
port B shall be respected. The recommended engagement of fixing screw thread for ferrous mounting is 1,25D.
b
Suggested diameter of port B, but may be of any size located within the space between the dimensions indicated as 30 mm
and 57 mm; port B is not necessarily machined and may be provided by casting.
c
The depth and angle of the pilot ports and the main ports are determined by the graphical layout of the hydraulic circuit and
by the location of the valves in the manifold.
d
Blind hole to accommodate the locating pin on the valve cover.
e
The depth of d , d and G are given in the tables as dimension Z.
1 2
Dimensions and geometrical tolerances in millimetres

a
The dimension specifying the area within the chain lines is the minimum dimension for mounting the cartridge
valve cover. The corners of the square may be rounded to a maximum radius, r , equal to the thread diameter of
max
the fixing screws. Along each axis, the fixing holes are at equal distances to the valve cover mounting surface edges.
b
Pilot valves and adjustment devices may exceed this dimension.
c
This dimension gives the minimum space required for a two-port hydraulic slip-in cartridge valve and its cover with
this cavity. The dimension is also the minimum distance from centreline to centreline of two identical cavities on a
manifold. The valve manufacturer’s attention is drawn to the fact that no part of the complete valve assembly shall
exceed this dimension.
d
No burrs permitted in this area; the edges shall be rounded.
e
Visual examination.
f
Minimum length over which the specified surface finish shall apply.
Figure 4 — Cavity for two-port hydraulic slip-in cartridge main system pressure-relief
valves with main ports of 25 mm nominal diameter (size 08) and square flange cover
(code: 7368 - 08 - 04 - 1 - 25)

Table 4 — Cavity for two-port hydraulic slip-in cartridge main system pressure-relief valves with
main ports of 25 mm nominal diameter (size 08) and square flange cover
Dimensions in millimetres
e e c b,c c c c c a a a a d,e
d d d d X Y Z Z F F F F G R R
1 2 3 4 1 2 1 2 3 4 1 2
Axis
ø 45 ø 34 ø 25 ø 6 ø 6 ø 6 ø 6 ø 6 R2 R1
ø 25 M12 M12 M12 M12
H7 H7 max. max. max. max. max. H13 max. max.
X 29 29 29 — −4 62 29 29 0 58 58 0 58 — —
Y 29 29 29 — 29 29 −4 62 0 0 58 58 45 — —
Z 58 ± 0,2 72 + 0,1 — — — — — — — — — — 8 min. — —
a
The minimum thread depth is 1,8 times the screw diameter, D. The recommended full thread depth is 2D + 6 mm to facilitate
interchangeability of valves and to reduce the number of fixing screw lengths. However, sufficient distance from fixing hole to
port B shall be respected. The recommended engagement of fixing screw thread for ferrous mounting is 1,25D.
b
Suggested diameter of port B, but may be of any size located within the space between the dimensions indicated as 30 mm
and 57 mm; port B is not necessarily machined and may be provided by casting.
c
The depth and angle of the pilot ports and the main ports are determined by the graphical layout of the hydraulic circuit and
by the location of the valves in the manifold.
d
Blind hole to accommodate the locating pin on the valve cover.
e
The depth of d , d and G are given in the tables as dimension Z.
1 2
Dimensions and geometrical tolerances in millimetres

a
The dimension specifying the area within the chain lines is the minimum dimension for mounting the cartridge
valve cover. The corners of the square may be rounded to a maximum radius, r , equal to the thread diameter of
max
the fixing screws. Along each axis, the fixing holes are at equal distances to the valve cover mounting surface edges.
b
Pilot valves and adjustment devices may exceed this dimension.
c
This dimension gives the minimum space required for a two-port hydraulic slip-in cartridge valve and its cover with
this cavity. The dimension is also the minimum distance from centreline to centreline of two identical cavities on a
manifold. The valve manufacturer’s attention is drawn to the fact that no part of the complete valve assembly shall
exceed this dimension.
d
No burrs permitted in this area; the edges shall be rounded.
e
Visual examination.
f
Minimum length over which the specified surface finish shall apply.
Figure 5 — Cavity for two-port hydraulic slip-in cartridge valves of all types, except main system
pressure-relief valves, with main ports of 32 mm nominal diameter (size 09) and square flange
cover (code: 7368 - 09 - 05 - 1 - 25)

Table 5 — Cavity for two-port hydraulic slip-in cartridge valves of all types, except
main system pressure-relief valves, with main ports of 32 mm nominal diameter (size 09)
and square flange cover
Dimensions in millimetres
e e c b,c c c c c a a a a d,e
d d d d X Y Z Z F F F F G R R
1 2 3 4 1 2 1 2 3 4 1 2
Axis
ø 60 ø 45 ø 32 ø 8 ø 8 ø 8 ø 8 ø 6 R2 R1
ø 32 M16 M16 M16 M16
H7 H7 max. max. max. max. max. H13 max. max.
X 35 35 35 — −6 76 35 35 0 70 70 0 18 — —
Y 35 35 35 — 35 35 −6 76 0 0 70 70 0 — —
Z 70 ± 0,2 85 + 0,1 — — — — — — — — — — 8 min. — —
a
The minimum thread depth is 1,8 times the screw diameter, D. The recommended full thread depth is 2D + 6 mm to
facilitate interchangeability of valves and to reduce the number of fixing screw lengths. However, sufficient distance from
fixing hole to port B shall be respected. The recommended engagement of fixing screw thread for ferrous mounting is 1,25D.
b
Suggested diameter of port B, but may be of any size located within the space between the dimensions indicated as
30 mm and 68,5 mm; port B is not necessarily machined and may be provided by casting.
c
The depth and angle of the pilot ports and the main ports are determined by the graphical layout of the hydraulic circuit
and by the location of the valves in the manifold.
d
Blind hole to accommodate the locating pin on the valve cover.
e
The depth of d , d and G are given in the tables as dimension Z.
1 2
Dimensions and geometrical tolerances in millimetres

a
The dimension specifying the area within the chain lines is the minimum dimension for mounting the cartridge
valve cover. The corners of the square may be rounded to a maximum radius, r , equal to the thread diameter of
max
the fixing screws. Along each axis, the fixing holes are at equal distances to the valve cover mounting surface edges.
b
Pilot valves and adjustment devices may exceed this dimension.
c
This dimension gives the minimum space required for a two-port hydraulic slip-in cartridge valve and its cover with
this cavity. The dimension is also the minimum distance from centreline to centreline of two identical cavities on a
manifold. The valve manufacturer’s attention is drawn to the fact that no part of the complete valve assembly shall
exceed this dimension.
d
No burrs permitted in this area; the edges shall be rounded.
e
Visual examination.
f
Minimum length over which the specified surface finish shall apply.
Figure 6 — Cavity for two-port hydraulic slip-in cartridge main system pressure-relief
valves with main ports of 32 mm nominal diameter (size 09) and square flange cover
(code: 7368 - 09 - 06 - 1 - 25)

Table 6 — Cavity for two-port hydraulic slip-in cartridge main system pressure-relief valves with
main ports of 32 mm nominal diameter (size 09) and square flange cover
Dimensions in millimetres
e e c b,c c c c c a a a a d,e
d d d d X Y Z Z F F F F G R R
1 2 3 4 1 2 1 2 3 4 1 2
Axis
ø 60 ø 45 ø 32 ø 8 ø 8 ø 8 ø 8 ø 6 R2 R1
ø 32 M16 M16 M16 M16
H7 H7 max. max. max. max. max. H13 max. max.
X 35 35 35 — −6 76 35 35 0 70 70 0 70 — —
Y 35 35 35 — 35 35 −6 76 0 0 70 70 52 — —
Z 70 ± 0,2 85 + 0,1 — — — — — — — — — — 8 min. — —
a
The mi
...