BRITISH STANDARD BS ISO

12151-3:1999
Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 18 23:14:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI

Connections for
hydraulic fluid power
and general use —
Hose fittings —
Part 3: Hose fittings with ISO 6162
flange ends

ICS 23.100.40
 BS ISO 12151-3:1999
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National foreword

This British Standard reproduces verbatim ISO 12151-3:1999 and implements

it as the UK national standard.
The UK participation in its preparation was entrusted to Technical Committee
MCE/18, Fluid power systems and components, which has the responsibility to:
— aid enquirers to understand the text;
— present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep the UK
interests informed;
— monitor related international and European developments and
promulgate them in the UK.
A list of organizations represented on this committee can be obtained on
request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Standards
Catalogue under the section entitled “International Standards Correspondence
Index”, or by using the “Find” facility of the BSI Standards Electronic
Catalogue.
A British Standard does not purport to include all the necessary provisions of
a contract. Users of British Standards are responsible for their correct
application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii,
the ISO title page, pages ii to iv, pages 1 to 10, an inside back cover and
a back cover.
This standard has been updated (see copyright date) and may have had
amendments incorporated. This will be indicated in the amendment table on
the inside front cover.

This British Standard, having

Amendments issued since publication
been prepared under the
direction of the Engineering Amd. No. Date Comments
Sector Committee, was
published under the authority
of the Standards Committee
and comes into effect on
15 August 1999

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ISBN 0 580 32754 X

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© BSI 04-2000
Foreword
National foreword
Contents

Text of ISO 12151-3

iii
Inside front cover
Page

1
BS ISO 12151-3:1999

i
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 BS ISO 12151-3:1999
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Contents
Page
Foreword iii
Introduction 1
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Performance requirements 2
5 Designation of hose fittings 2
6 Design 3
7 Manufacture 3
7.1 Construction 3
7.2 Workmanship 3
7.3 Finish 3
7.4 Fitting protection 4
8 Procurement information 4
9 Marking 4
10 Identification statement 4
Bibliography Inside back cover
Figure 1 — Typical example of hose fitting connection with
ISO 6162 flange end 1
Figure 2 — Straight flange hose fittings (S) 4
Figure 3 — 45° elbow flange hose fittings (E45) 5
Figure 4 — 90° elbow flange hose fittings (E) 6
Figure 5 — 22,5° elbow flange hose fittings (E22) 7
Figure 6 — 30° elbow flange hose fittings (E30) 7
Figure 7 — 60° elbow flange hose fittings (E60) 8
Figure 8 — 67,5° elbow flange hose fittings (E67) 9
Table 1 — Symbols for designation of flange type 3
Table 2 — Dimensions of straight flange hose fittings (S) 5
Table 3 — Dimensions of 45° elbow flange hose fittings (E45) 5
Table 4 — Dimensions of 90° elbow flange hose fittings (E) 6
Table 5 — Dimensions of 22,5° elbow flange hose fittings (E22) 7
Table 6 — Dimensions of 30° elbow flange hose fittings (E30) 8
Table 7 — Dimensions of 60° elbow flange hose fittings (E60) 9
Table 8 — Dimensions of 67,5° elbow flange hose fittings (E67) 10

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Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that
committee. International organizations, governmental and non-governmental,
in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the
ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 12151-3 was prepared by Technical Committee
ISO/TC 131, Fluid power systems, Subcommittee SC 4, Connectors and similar
products and components.
ISO 12151 consists of the following parts, under the general title Connections for
hydraulic fluid power and general use — Hose fittings:
— Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends;
— Part 2: Hose fittings with ISO 8434-1 and 8434-4 24° cone connector ends
with O-rings;
— Part 3: Hose fittings with ISO 6162 flange ends;
— Part 4: Hose fittings with ISO 6149 metric stud ends;
— Part 5: Hose fittings with ISO 8434-2 37° flared ends.

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Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure
within an enclosed circuit. In general applications, the fluid may be conveyed under pressure.
Components are connected through their ports by stud ends on fluid conductor fittings to tubes/pipes or to
hose fittings and hoses.

1 Scope
This part of ISO 12151 specifies the general and dimensional requirements for the design and performance
of flange hose fittings, made of carbon steel, for nominal hose inside diameters of 12,5 mm to 51 mm
inclusive, in accordance with ISO 4397, for use with ports and clamps in accordance with ISO 6162.
NOTE 1 Materials other than carbon steel may be supplied as agreed between the manufacturer and user.
NOTE 2 For hose fittings used in hydraulic and pneumatic braking systems on road vehicles (as defined in the scope of
ISO/TC 22/SC 2), see ISO 4038, ISO 4039-1 and ISO 4039-2.
These hose fittings (see Figure 1 for a typical example) are for use in hydraulic fluid power systems with
hose that meets the requirements of the respective hose standards and in general applications with
suitable hoses.

Figure 1 — Typical example of hose fitting connection with ISO 6162 flange end

2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute
provisions of this part of ISO 12151. For dated references, subsequent amendments to, or revisions of, any
of these publications do not apply. However, parties to agreements based on this part of ISO 12151 are
encouraged to investigate the possibility of applying the most recent editions of the normative documents
indicated below. For undated references, the latest edition of the normative document referred to applies.
Members of ISO and IEC maintain registers of currently valid International Standards.
ISO 4397:1993, Fluid power systems and components — Connectors and associated components — Nominal
outside diameters of tubes and nominal inside diameters of hoses.
ISO 5598:1985, Fluid power systems and components — Vocabulary.

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ISO 6162:1994, Hydraulic fluid power — Four-screw split-flange connections for use at pressures of 2,5 MPa
to 40 MPa (25 bar to 400 bar) — Type I metric series and type II inch series.
ISO 8434-5:1995, Metallic tube connections for fluid power and general use — Part 5: Test methods for
threaded hydraulic fluid power connections.
ISO 9227:1990, Corrosion tests in artificial atmospheres — Salt spray tests.

3 Terms and definitions

For the purposes of this part of ISO 12151, the terms and definitions given in ISO 5598 apply.

4 Performance requirements
Hose assemblies shall meet the performance requirements specified in the appropriate hose specification
without leakage or failure.
The working pressure of the hose assembly shall be the lower of the pressures given for its flange style
(pressure series) and size in ISO 6162, and in the relevant hose specification.
Hose fitting tests shall be conducted in accordance with ISO 8434-5 for the working pressure of the hose
assembly. The hose assembly shall undergo a cyclic endurance test and meet or exceed the number of cycles
specified in the relevant hose specification.

5 Designation of hose fittings

5.1 Hose fittings shall be designated by an alphanumeric code to facilitate ordering. They shall be
designated by ISO 12151-3, followed by a spaced hyphen, then the shape symbol (see Table 1), followed by
another spaced hyphen, the style letter L for 2,5 MPa to 35 MPa (25 bar to 350 bar) flanges or the style
letter S for 40 MPa (400 bar) flanges in accordance with ISO 6162 followed by the flange size from
ISO 6162, a multiplication symbol (×) and the hose size (nominal hose inside diameter in accordance with
ISO 4397).
EXAMPLE
A 45° elbow hose fitting, with a medium drop length (E45) with a 40 MPa (400 bar) flanged head (S) 32 mm
nominal flange size and 31,5 nominal ID hose, is designated as follows:
ISO 12151-3 – E45M – S32 × 31,5
5.2 The symbols given in Table 1 shall be used.

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Table 1 — Symbols for designation of flange type

Style Letter
2,5 to 35 MPa (25 bar to 350 bar) L
40 MPa (400 bar) S
Shape Symbol
Straight S
45° elbow, short E45S
45° elbow, medium E45M
90° elbow, short ES
90° elbow, medium EM
The following fitting angles are not preferred: Symbol
22,5° elbow, medium E22M
30° elbow, short E30S
30° elbow, medium E30M
60° elbow, short E60S
60° elbow, medium E60M
67,5° elbow, short E67S
67,5° elbow, medium E67M

6 Design
6.1 Hose fitting dimensions shown in Figure 2 to Figure 8 shall conform to those given in Table 2 to
Table 8 and to the relevant dimensions in ISO 6162.
6.2 Angular tolerances on axes of ends of elbows shall be ± 3° for all sizes.
6.3 Details of contour shall be as chosen by the manufacturer, provided that the dimensions given in
Table 2 to Table 8 are maintained.

7 Manufacture
7.1 Construction
Fittings may be made by forging or cold forming, machined from barstock or manufactured from multiple
components.
7.2 Workmanship
Workmanship shall conform to the best commercial practice to produce high quality fittings. Fittings shall
be free from visual contaminants, all hanging burrs, loose scale and slivers which might be dislodged in
use, and any other defects that might affect the function of the parts. All machined surfaces shall have a
surface roughness value of Ra u 6,3 4m, except where otherwise specified.
7.3 Finish
The external surface and threads of all carbon steel parts shall be plated or coated with a suitable material
that passes a 72 h neutral salt spray test in accordance with ISO 9227, unless otherwise agreed upon by
the manufacturer and the user. Any appearance of red rust during the salt spray test on any area, except
those noted below, shall be considered failure:
— all internal fluid passages;
— edges, such as hex points, serrations and crests of threads, where there may be mechanical
deformation of the plating or coating typical of mass-produced parts or shipping effects;
— areas where there is mechanical deformation of the plating or coating caused by crimping, flaring,
bending and other post-plate metal forming operations;
— areas where the parts are suspended or affixed in the test chamber where condensate can accumulate.

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Internal fluid passages shall be protected from corrosion during storage.

NOTE Cadmium plating is not preferred due to environmental concerns. Changes in plating may affect assembly torques and
require requalification, when applicable.
7.4 Fitting protection
By a method agreed between the supplier and purchaser, the face of the flange fittings shall be protected
by the manufacturer from nicks and scratches that would be detrimental to the function of the fitting.
Passages shall be securely covered to prevent the entrance of dirt or other contaminants.

8 Procurement information
The following minimum information should be supplied by the purchaser when making an inquiry or
placing an order:
— description of fitting (using designation in accordance with clause 5);
— material of fitting (if other than carbon steel);
— hose type and size;
— fluid to be conveyed;
— working pressure;
— working temperature (ambient and of the fluid).

9 Marking
Hose fittings shall be permanently marked with the manufacturer’s name or trademark.

10 Identification statement (Reference to this part of ISO 12151)

Use the following statement in test reports, catalogues and sales literature when electing to comply with
ISO 12151-3:
“Flange hose fittings in accordance with ISO 12151-3:1999, Connections for hydraulic fluid power and
general use — Hose fittings — Part 3: Hose fittings with ISO 6162 flange ends”.

NOTE 1 Connection details and O-rings in accordance with ISO 6162.

NOTE 2 Method of attachment of fitting to hose is optional.
Figure 2 — Straight flange hose fittings (S)

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Table 2 — Dimensions of straight flange hose fittings (S)

Dimensions in millimetres
d
d1 (nominal d2a Lb
Nominal
Fitting size ± 0,25 inside diameter
flange size
of hose)
S-L S-S min. max.
13 × 12,5 30,2 31,8 13 12,5 8 100
19 × 19 38,1 41,3 19 19 14 140
25 × 25 44,45 47,6 25 25 19 150
32 × 31,5 50,8 54 32 31,5 25 175
38 × 38 60,35 63,5 38 38 31 200
51 × 51 71,4 79,4 51 51 42 240
a Minimum diameter at any point through the fitting prior to assembly to the hose. The diameter after assembly shall not be less
than 0,9d2.
b
Dimension L is measured after assembly.

NOTE 1 Connection details and O-rings in accordance with ISO 6162.

NOTE 2 Method of attachment of fitting to hose is optional.
Figure 3 — 45° elbow flange hose fittings (E45)

Table 3 — Dimensions of 45° elbow flange hose fittings (E45)

Dimensions in millimetres
d L1
d1 (nominal d2a L2b
± 0,25 Nominal ±3
Fitting size inside diameter of
E45S-L E45S-S flange size E45S-L E45M-L
hose)
E45M-L E45M-S min. E45S-S E45M-S max.
13 × 12,5 30,2 31,8 13 12,5 8 — 19 105
19 × 19 38,1 41,3 19 19 14 — 26 145
25 × 25 44,45 47,6 25 25 19 28 32 175
32 × 31,5 50,8 54 32 31,5 25 32 38 200
38 × 38 60,35 63,5 38 38 31 38 44 240
51 × 51 71,4 79,4 51 51 42 52 56 290
a
Minimum diameter at any point through the fitting prior to bending and/or assembly to the hose. The diameter after bending
and/or assembly shall not be less than 0,9d2.
b
Dimension L2 is measured after assembly.

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NOTE 1 Connection details and O-rings in accordance with ISO 6162.

NOTE 2 Method of attachment of fitting to hose is optional.
Figure 4 — 90° elbow flange hose fittings (E)

Table 4 — Dimensions of 90° elbow flange hose fittings (E)

Dimensions in millimetres
d L3
d1 (nominal d2a L4b
± 0,25 Nominal ±3
Fitting size inside diameter
flange size
ES-L ES-S of hose) ES-L EM-L
EM-L EM-S min. ES-S EM-S max.
13 × 12,5 30,2 31,8 13 12,5 8 — 40 100
19 × 19 38,1 41,3 19 19 14 — 58 140
25 × 25 44,45 47,6 25 25 19 61 70 170
32 × 31,5 50,8 54 32 31,5 25 68 90 200
38 × 38 60,35 63,5 38 38 31 81 104 230
51 × 51 71,4 79,4 51 51 42 120 138 280
a
Minimum diameter at any point through the fitting prior to bending and/or assembly to the hose. The diameter after bending
and/or assembly shall not be less than 0,9d2.
b
Dimension L4 is measured after assembly.

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NOTE 1 Connection details and O-rings in accordance with ISO 6162.

NOTE 2 Method of attachment of fitting to hose is optional.
NOTE 3 This fitting angle is not preferred.
Figure 5 — 22,5° elbow flange hose fittings (E22)

Table 5 — Dimensions of 22,5° elbow flange hose fittings (E22)

Dimensions in millimetres
d L5
d1 (nominal d2a L6b
± 0,25 Nominal inside ±3
Fitting size
flange size diameter
E22M-L
E22M-L E22M-S of hose)
min. E22M-S max.
13 × 12,5 30,2 31,8 13 12,5 8 9 105
19 × 19 38,1 41,3 19 19 14 11 135
25 × 25 44,45 47,6 25 25 19 14 170
32 × 31,5 50,8 54 32 31,5 25 15 205
38 × 38 60,35 63,5 38 38 31 18 250
51 × 51 71,4 79,4 51 51 42 22 305
a
Minimum diameter at any point through the fitting prior to bending and/or assembly to the hose. The diameter after bending
and/or assembly shall not be less than 0,9d2.
b
Dimension L6 is measured after assembly.

NOTE 1 Connection details and O-rings in accordance with ISO 6162.

NOTE 2 Method of attachment of fitting to hose is optional.
NOTE 3 This fitting angle is not preferred.
Figure 6 — 30° elbow flange hose fittings (E30)

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Table 6 — Dimensions of 30° elbow flange hose fittings (E30)

Dimensions in millimetres
d L7
d1 (nominal d2a L8b
± 0,25 Nominal ±3
Fitting size inside diameter
flange size
E30S-L E30S-S of hose) E30S-L E30M-L
E30M-L E30M-S min. E30S-S E30M-S max.
13 × 12,5 30,2 31,8 13 12,5 8 — 12 105
19 × 19 38,1 41,3 19 19 14 — 16 145
25 × 25 44,45 47,6 25 25 19 — 19 170
32 × 31,5 50,8 54 32 31,5 25 20 22 200
38 × 38 60,35 63,5 38 38 31 25 30 245
51 × 51 71,4 79,4 51 51 42 — 32 300
a
Minimum diameter at any point through the fitting prior to bending and/or assembly to the hose. The diameter after bending
and/or assembly shall not be less than 0,9d2.
b
Dimension L8 is measured after assembly.

NOTE 1 Connection details and O-rings in accordance with ISO 6162.

NOTE 2 Method of attachment of fitting to hose is optional.
NOTE 3 This fitting angle is not preferred.
Figure 7 — 60° elbow flange hose fittings (E60)

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Table 7 — Dimensions of 60° elbow flange hose fittings (E60)

Dimensions in millimetres
d L9
d1 (nominal d2a L10b
± 0,25 Nominal ±3
Fitting size inside diameter
flange size
E60S-L E60S-S of hose) E60S-L E60M-L
E60M-L E60M-S min. E60S-S E60M-S max.
13 × 12,5 30,2 31,8 13 12,5 8 — 27 110
19 × 19 38,1 41,3 19 19 14 — 37 145
25 × 25 44,45 47,6 25 25 19 — 44 180
32 × 31,5 50,8 54 32 31,5 25 45 55 230
38 × 38 60,35 63,5 38 38 31 53 64 280
51 × 51 71,4 79,4 51 51 42 75 83 310
a
Minimum diameter at any point through the fitting prior to bending and/or assembly to the hose. The diameter after bending
and/or assembly shall not be less than 0,9d2.
b
Dimension L10 is measured after assembly.

NOTE 1 Connection details and O-rings in accordance with ISO 6162.

NOTE 2 Method of attachment of fitting to hose is optional.
NOTE 3 This fitting angle is not preferred.
Figure 8 — 67,5° elbow flange hose fittings (E67)

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Table 8 — Dimensions of 67,5° elbow flange hose fittings (E67)

Dimensions in millimetres
d L11
d1 (nominal d2a L12b
± 0,25 Nominal inside ±3
Fitting size
flange size diameter
E67S-L E67S-S E67S-L E67M-L
of hose)
E67M-L E67M-S min. E67S-S E67M-S max.
13 × 12,5 30,2 31,8 13 12,5 8 — 30 105
19 × 19 38,1 41,3 19 19 14 — 42 145
25 × 25 44,45 47,6 25 25 19 — 51 175
32 × 31,5 50,8 54 32 31,5 25 51 64 220
38 × 38 60,35 63,5 38 38 31 61 74 260
51 × 51 71,4 79,4 51 51 42 85 97 300
a
Minimum diameter at any point through the fitting prior to bending and/or assembly to the hose. The diameter after bending
and/or assembly shall not be less than 0,9d2.
b
Dimension L12 is measured after assembly.

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Bibliography
[1] ISO 1436:1991, Rubber hoses and hose assemblies — Wire-reinforced hydraulic type — Specification.
[2] ISO 3862:1991, Rubber hoses and hose assemblies — Rubber-covered, spiral wire reinforced, hydraulic
type — Specification.
[3] ISO 3949:1991, Plastics hoses and hose assemblies — Thermoplastics, textile-reinforced, hydraulic
type — Specification.
[4] ISO 4038:1996, Road vehicles — Hydraulic braking systems — Simple flare pipes, tapped holes, male
fittings and hose end fittings.
[5] ISO 4039-1:1998, Road vehicles — Pneumatic braking systems — Part 1: Pipes, male fittings and tapped
holes with facial sealing surface.
[6] ISO 4039-2:1998, Road vehicles — Pneumatic braking systems — Part 2: Pipes, male fittings and holes
with conical sealing surface.
[7] ISO 4079:1991, Rubber hoses and hose assemblies — Textile-reinforced hydraulic type — Specification.

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