prEN 857

SLOVENSKI STANDARD
01-december-2024
Gumene cevi in cevni priključki - Z jeklenim kordom ojačene trdne hidravlične cevi
- Specifikacija
Rubber hoses and hose assemblies - Wire braid reinforced compact type for hydraulic
applications - Specification
Gummischläuche und -schlauchleitungen - Kompakthydraulikschläuche mit
Drahtgeflechteinlage - Spezifikation
Tuyaux et flexibles en caoutchouc - Type hydraulique compact avec armature de fils
métalliques - Spécification
Ta slovenski standard je istoveten z: prEN 857
ICS:
23.040.70 Gumene cevi in armature Hoses and hose assemblies
23.100.40 Cevna napeljava in sklopke Piping and couplings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2024
ICS 23.100.40 Will supersede EN 857:2015
English Version
Rubber hoses and hose assemblies - Wire braid reinforced
compact type for hydraulic applications - Specification
Tuyaux et flexibles en caoutchouc - Type hydraulique Gummischläuche und -schlauchleitungen -
compact avec armature de fils métalliques - Kompakthydraulikschläuche mit Drahtgeflechteinlage -
Spécification Spezifikation
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 218.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 857:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Types of hoses . 5
5 Materials and construction . 5
5.1 Hoses . 5
5.2 Hose assemblies . 5
6 Dimensions. 5
6.1 Diameters and concentricity . 5
6.2 Length. 6
6.2.1 Hoses . 6
6.2.2 Hose assemblies . 7
7 Requirements . 7
7.1 Hydrostatic requirements . 7
7.2 Minimum bend radius . 8
7.3 Impulse test requirements . 9
7.4 Leakage of hose assemblies . 9
7.5 Cold flexibility . 9
7.6 Adhesion between components . 10
7.7 Vacuum resistance . 10
7.8 Abrasion resistance . 10
7.9 Fluid resistance . 11
7.9.1 Test pieces . 11
7.9.2 Oil resistance . 11
7.9.3 Water based fluid resistance . 11
7.9.4 Water resistance . 11
7.10 Ozone resistance . 11
8 Designation . 11
9 Frequency of testing . 11
10 Marking . 12
10.1 Hoses . 12
10.2 Hose assemblies . 12
Annex A (normative) Test frequency for type tests and routine tests . 13
Bibliography . 15

European foreword
This document (prEN 857:2024) has been prepared by Technical Committee CEN/TC 218 “Rubber and
plastics hoses and hose assemblies”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 857:2015.
This document includes the following significant technical changes with respect to EN 857:2015:
— updated normative references;
— added big sizes on 2SC hose type;
— tolerances for inside diameter in Table 1;
— Table 7 added;
— Annex A deleted;
— Annex C deleted.
1 Scope
This document specifies requirements for two types of wire braid reinforced compact hoses and hose
assemblies of nominal bore from 6 to 76, types 1SC and 2SC.
They are suitable for use with:
— hydraulic fluids in accordance with ISO 6743-4 with the exception of HFD R, HFD S and HFD T at
temperatures ranging from −40 °C to +100 °C;
— water based fluids at temperatures ranging from −40 °C to +70 °C;
— water at temperatures ranging from 0 °C to +70 °C.
The hoses are not suitable for use with castor oil based nor phosphoric ester-based fluids.
This document does not include requirements for end fittings. It is limited to the performance of hoses
and hose assemblies.
NOTE Requirements for hydraulic hoses for underground mining are covered in other documents.
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.
EN ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing (ISO 1402)
EN ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions
of hoses and the lengths of hose assemblies (ISO 4671)
EN ISO 6803, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without
flexing (ISO 6803)
EN ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum
(ISO 7233)
EN ISO 7326:2016, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
(ISO 7326:2016)
EN ISO 8033:2006, Rubber and plastics hoses — Determination of adhesion between components
(ISO 8033:2006)
EN ISO 10619-2:2021, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —
Part 2: Bending tests at sub-ambient temperatures (ISO 10619-2:2021)
ISO 1817:2024, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO/TS 20444, Rubber and plastics hoses — Determination of abrasion resistance of the outer cover
3 Terms and definitions
No terms and definitions are listed in this document.

Under preparation. Stage at the time of preparation: ISO/DTS 20444
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Types of hoses
Two types of hoses are specified:
1) type 1SC – hoses with a single braid of wire reinforcement;
2) type 2SC – hoses with two braids of wire reinforcement.
Hoses and hose assemblies are not be operated outside the limits of this document.
5 Materials and construction
5.1 Hoses
Hoses shall consist of an oil and water-resistant synthetic rubber lining, one or two braid of steel wire,
and an oil and weather resistant synthetic rubber cover. Each braid wire shall be separated by an
insulating layer of synthetic rubber.
5.2 Hose assemblies
Hose assemblies shall only be manufactured with those hose fittings whose functionality has been
verified in accordance with 7.1, 7.3, 7.4 and 7.5 of this document.
6 Dimensions
6.1 Diameters and concentricity
The diameters of the hoses shall be measured in accordance with EN ISO 4671 and as such shall conform
to the values in Table 1
Table 1 — Diameters of hoses
Dimensions in millimetres, except nominal bore
All types Type 1SC Type 2SC
Outside Outside
Nominal Diameter over Diameter over
Inside diameter diameter diameter
bore reinforcement reinforcement
of hose of hose
min. max. min. max. max. min. max. max.
6 6,4 6,9 9,6 10,8 13,5 10,6 11,7 14,2
8 7,9 8,5 10,9 12,1 14,5 12,1 13,3 16,0
10 9,5 10,1 12,7 14,5 16,9 14,4 15,6 18,3
12 12,7 13,5 15,9 18,1 20,4 17,5 19,1 21,5
16 15,8 16,7 19,8 21,0 23,0 20,5 22,3 24,7
19 18,8 19,8 23,2 24,4 26,7 24,6 26,4 28,6
25 25,4 26,4 30,7 31,9 34,9 32,5 34,3 36,6
31 31,8 33,0 37,8 39,0 42,2 39,3 41,7 44,3
38 38,1 39,3 NA NA NA 45,6 48,7 52,6
51 50,6 52,0 NA NA NA 58,7 61,6 65,2
63 62,3 64,7 NA NA NA 70,5 74 77,5
76 75,0 77,4 NA NA NA 82,5 88,0 91,5
The test shall be carried out in accordance with EN ISO 4671. The concentricity of the hoses shall conform
to the values given in Table 2.
Table 2 — Concentricity of hoses
Dimensions in millimetres, except nominal bore
Maximum variation in wall thickness
Nominal bore
Between inside diameter and Between inside diameter and
outside diameter reinforcement diameter
6 0,8 0,4
Over 6 and including 19 1,0 0,6
Over 19 1,3 0,8
6.2 Length
6.2.1 Hoses
Hoses shall be supplied in lengths as specified by the purchaser, subject to a tolerance on the specified
lengths of
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