kSIST FprEN 14420-7:2026

• Abstract:

  This document specifies the design, materials, dimensions and marking requirements for cam locking couplings that serve as the link between hoses and connections to transport liquids, solids and gases, except liquid gas and steam.; For all sizes of aluminium cast material couplings and for all couplings of size DN 100, the pressure range is from −0,8 bar to 10 bar in the working temperature range from −20 °C to +65 °C. All other couplings according to this document are capable of operating within the pressure range from 0,8 bar to 16 bar in the working temperature range from −20 °C to +65 °C.

• Status: Not Published
• Public Enquiry End Date: 19-Jan-2026
• ICS: 23.040.60 - Flanges, couplings and joints
• ICS: 23.040.70 - Hoses and hose assemblies
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 12-Oct-2026
• Due Date: 30-Nov-2026
• Completion Date: 13-Oct-2026
• Ref Project: FprEN 14420-7 - Hose fittings with clamp units - Part 7: Cam locking couplings

• Revises: SIST EN 14420-7:2022 - Hose fittings with clamp units - Part 7: Cam locking couplings
• Effective Date: 12-Mar-2025

kSIST FprEN 14420-7:2026 is the Slovenian adoption of the CEN draft European Standard prEN 14420-7, published by SIST. It covers hose fittings with clamp units, specifically cam locking couplings. The document specifies design, materials, dimensions and marking for couplings that connect hoses to installations for liquids, solids and gases, so manufacturers, hose assemblers, specifiers and buyers can check compatibility and service limits.

What does kSIST FprEN 14420-7:2026 specify?

kSIST FprEN 14420-7:2026 specifies cam locking couplings for hose-to-connection service, while excluding liquid gas and steam. It also sets the main size, material, marking and test-related rules that let parts from different manufacturers work together.

The document is laid out in clauses 1 to 11, followed by one informative annex. Clauses 1 to 3 cover scope, normative references, and terms and definitions; clauses 4 to 11 cover construction, survey, connection types, designation, dimensions, materials, marking, and type testing/quality control.

Annex	What it covers
Annex A	Gauges for cam-locking couplings

What are the key requirements of kSIST FprEN 14420-7:2026?

kSIST FprEN 14420-7:2026 focuses on three practical points: the coupling must seal under vibration, the parts must fit the named connection types, and the materials must suit the conveyed product. In practice, this is the part of the standard that decides whether a coupling is acceptable for manufacture, stock control, and interchange between suppliers.

Construction and operating behaviour

Clause 4 requires the lever shape, adapter shape and main gasket dimensions to be coordinated so that hose twisting and vibration in service do not lead to leakage. Cam arms must be manually operable and usable without tools. For users, that means the coupling is intended for hand operation and for repeated connection and disconnection in the field.

Clause 4 also points users to Annex A for gauges for cam-locking couplings. The note in this clause says that, when the document is met, couplers and adapters from different manufacturers remain compatible, although spare-part interchangeability other than gaskets cannot be guaranteed.

Pressure and temperature limits

The scope gives two pressure ranges tied to coupling material and size. For all sizes of aluminium cast material couplings and for all couplings of size DN 100, the working range is from −0,8 bar to 10 bar at −20 °C to +65 °C. All other couplings in the document are capable of operating within the stated range of 0,8 bar to 16 bar at the same temperature window.

Clause 4.2 adds the working temperature range for couplings fitted with nitrile butadiene rubber gaskets (NBR gaskets): −20 °C to +65 °C. For buyers and engineers, this means gasket choice and body material both affect whether the assembly fits the service conditions.

Connection types and matching parts

Clause 6 assigns the permitted connection families. The document covers coupler and adapter pairs for internal thread, external thread, welding connection, hose tail, dust cap and dust plug arrangements. Threaded types are linked to thread standards such as EN ISO 228-1 and EN 10226-1, while hose-tail versions and some dimensions refer to EN 14420-2 and EN 14420-5.

In practice, this is the clause that tells the user which coupler type matches which adapter type. It is important for ordering the right end connections and avoiding mixed pairs that do not fit.

Designation and ordering

Clause 7 gives ordering designations for a complete coupler, a complete adapter and the main gasket. The examples show the order of information: product name, EN 14420 reference, item number where relevant, nominal size, type code and material. That helps purchasing and stock systems identify exactly which part is being specified.

Dimensions and tolerances

Clause 8 gives the dimensional data for all main parts, including the coupler types DF, BF, DW, CC and DC, the cam arm, pin, ring, main gasket, thread gasket, and adapter types AF, FF, AW, EC and DP. Dimensions are in millimetres, and general tolerances are linked to EN 22768-1 and EN 22768-2.

For production and inspection, this clause is the key manufacturing reference. It defines the geometry of the coupling body, the hand lever, the locking parts and the sealing parts, and it also uses specific figures and tables for each type. Clause 8.3 adds torque and compression values for the cam arm geometry, so the lever must close with the intended gasket compression.

Materials, marking and control

Clause 9 limits the material families for bodies, cam arms, pins, rings and gaskets. The main gasket and thread gasket must be resistant to the conveyed fluid, and both must be made from non-asbestos materials. Clause 10 requires durable outside marking of the body and male parts with the standard number, manufacturer identification, type and nominal size, PN where applicable, and material number for stainless steels.

Clause 11 sends type testing and quality control to EN 14420-1:2013, Clause 7. For manufacturers, this means the general hose-fitting test and quality framework comes from Part 1, while Part 7 adds the cam locking coupling-specific design data.

What terms does kSIST FprEN 14420-7:2026 define?

kSIST FprEN 14420-7:2026 defines the key terms used to size and identify the couplings.

• Nominal size (DN) - an alphanumeric size designation for pipework components; the DN number is for reference and not a measured value.
• PN - an alphanumeric designation that identifies a reference combination of mechanical and dimensional characteristics of a hose fitting component.
• Main gasket - the gasket between the male and female parts of the coupling.
• Thread gasket - a flat-faced gasket for threads according to EN ISO 228-1.

Who uses kSIST FprEN 14420-7:2026?

kSIST FprEN 14420-7:2026 is used by manufacturers of hose fittings, suppliers of couplers and adapters, and engineers who design hose assemblies. It is also used by quality control teams and test labs that check dimensions, materials, marking and type tests.

In day-to-day work, it helps buyers choose compatible cam locking couplings, helps assemblers match couplers and adapters, and helps maintenance teams replace parts without changing the connection concept. It is relevant in transport systems for liquids, solids and gases where hand-operated quick connection is needed.

What changed in kSIST FprEN 14420-7:2026 from the previous edition?

kSIST FprEN 14420-7:2026 will supersede EN 14420-7:2022/AC:2023. The stated technical changes are limited to two editorial corrections: the symbol d6 was deleted from Figure 3 because it does not appear in the document, and the missing explanation for entry 1 was added to Figure 6.

Which standards are used with kSIST FprEN 14420-7:2026?

Standard	What it contributes
EN 755-2	Mechanical properties for extruded aluminium products used in body materials
EN 1706	Chemical composition and mechanical properties for aluminium castings
EN 1982	Copper and copper alloy ingots and castings used for body materials
EN 10088-1	Stainless steel list used for bodies, cam arms, pins and rings
EN 10213	Steel castings for pressure purposes used for some stainless steel body grades
EN 12420	Copper and copper alloy forgings used for forged body materials
EN 14420-1:2013	General requirements, fixing and connection types, designation and testing
EN 14420-2	Hose side parts of hose tail used for some coupler and adapter types
EN 14420-5	Threaded connections and the thread gasket reference
EN 22768-1	General linear and angular tolerances for unstated dimensions
EN 22768-2	General geometrical tolerances for unstated features
EN ISO 8330	Vocabulary for rubber and plastics hoses and hose assemblies
ISO 272	Widths across flats for hexagon products used in the DF coupling dimensions
EN 10226-1	Thread form for pressure-tight external threads used in BF/FF connections
EN ISO 228-1	Thread form for non-pressure-tight threads used in DF/AF connections
EN ISO 683-1	Material reference for the gauge body in Annex A
EN ISO 4957	Tool steels listed in the bibliography
EN ISO 6708:1995	Source for the DN concept used in the definition of nominal size

What does the kSIST FprEN 14420-7:2026 document contain?

kSIST FprEN 14420-7:2026 contains survey figures for example couplings, a parts list, connection-type tables, designation examples, and detailed dimensional drawings and tables for each coupler and adapter type. It also gives the cam arm torque and gasket compression data, which are used to set the closing action of the coupling.

The materials clause lists acceptable alloy families for each component, and the marking clause states what should appear on the outside of the body and male parts. Annex A then provides a gauge drawing, a gauge designation example and a dimension table for checking cam-locking couplings during design, inspection or verification.

SLOVENSKI STANDARD
oSIST prEN 14420-7:2026
01-januar-2026
Cevni fitingi z objemkami - 7. del: Spojke z vzvodno ročico
Hose fittings with clamp units - Part 7: Cam locking couplings
Schlaucharmaturen mit Klemmfassungen - Teil 7: Hebelarmkupplungen
Raccords pour flexibles avec demi-coquille - Partie 7 : Raccords à cames
Ta slovenski standard je istoveten z: prEN 14420-7
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
oSIST prEN 14420-7:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 14420-7:2026
oSIST prEN 14420-7:2026
DRAFT
EUROPEAN STANDARD
prEN 14420-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2025
ICS 23.040.70 Will supersede EN 14420-7:2022
English Version
Hose fittings with clamp units - Part 7: Cam locking
couplings
Raccords pour flexibles avec demi-coquille - Partie 7 : Schlaucharmaturen mit Klemmfassungen - Teil 7:
Raccords à cames Hebelarmkupplungen
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14420-7:2025 E
worldwide for CEN national Members.

oSIST prEN 14420-7:2026
prEN 14420-7:2025 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 6
4.1 Construction . 6
4.2 Temperatures . 7
5 Survey . 7
6 Types of connection. 9
7 Designation. 10
8 Dimensions . 10
8.1 General . 10
8.2 Coupler types . 10
8.2.1 Coupler type DF (item No. 1 a). 10
8.2.2 Coupler type BF (item No. 1 b). 12
8.2.3 Coupler type DW (item No. 1 c) . 13
8.2.4 Coupler type CC (item No. 1 d) . 13
8.2.5 Dust cap, Coupler type DC (item No. 1 e) . 15
8.3 Cam arm (item No. 2) . 16
8.4 Pin (item No. 3) . 18
8.5 Ring (item No. 4) . 18
8.6 Main gasket (item No. 5) . 19
8.7 Thread gasket (item No. 6) . 20
8.8 Adapter types . 20
8.8.1 Adapter type AF (item No. 8 a) . 20
8.8.2 Adapter type FF (item No. 8 b). 21
8.8.3 Adapter type AW (item No. 8 c) . 22
8.8.4 Adapter type EC (item No. 8 d) . 23
8.8.5 Dust plug, Adapter type DP (item No. 8 e) . 24
9 Materials . 25
9.1 General . 25
9.2 Coupler and adapter body . 25
9.3 Cam arm (item No. 2) . 26
9.4 Pin (item No. 3) . 26
9.5 Ring (item No. 4) . 26
9.6 Main gasket (item No. 5) . 26
9.7 Thread gasket (item No. 6) . 26
10 Marking . 27
11 Type testing and quality control . 27
Bibliography . 30
oSIST prEN 14420-7:2026
prEN 14420-7:2025 (E)
European foreword
This document (prEN 14420-7:2025) 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 14420-7:2022/AC:2023.
prEN 14420-7:2025 includes the following significant technical changes with respect to EN 14420-7:
2022/AC:2023:
— for Figure 3, the symbol d6 have been deleted as d6 does not appear in the document;
— for Figure 6, the missing explanation for entry 1 have been included.
The EN 14420 series, Hose fittings with clamp units, consists of the following parts:
— Part 1: Requirements, types of fixing and connection, designation and testing
— Part 2: Hose side parts of hose tail
— Part 3: Clamp units, bolted or pinned
— Part 4: Flange connections
— Part 5: Threaded connections
— Part 6: TW tank truck couplings
— Part 7: Cam locking couplings
— Part 8: Symmetrical half coupling (Guillemin system)
oSIST prEN 14420-7:2026
prEN 14420-7:2025 (E)
Introduction
Cam locking couplings are manufactured worldwide according to the American “military specification”
MIL-C-27487, which fixes the coupling side in a limited way, but not the connection side. Other parts like
levers, bolts, ring and gaskets are not standardized.
oSIST prEN 14420-7:2026
prEN 14420-7:2025 (E)
1 Scope
This document specifies the design, materials, dimensions and marking requirements for cam locking
couplings that serve as the link between hoses and connections to transport liquids, solids and gases,
except liquid gas and steam.
For all sizes of aluminium cast material couplings and for all couplings of size DN 100, the pressure range
is from −0,8 bar to 10 bar in the working temperature range from −20 °C to +65 °C. All other couplings
according to this document are capable of operating within the pressure range from 0,8 bar to 16 bar in
the working temperature range from −20 °C to +65 °C.
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 755-2, Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 2: Mechanical
properties
EN 1706, Aluminium and aluminium alloys - Castings - Chemical composition and mechanical properties
EN 1982, Copper and copper alloys - Ingots and castings
EN 10088-1, Stainless steels - Part 1: List of stainless steels
EN 10213, Steel castings for pressure purposes
EN 12420, Copper and copper alloys - Forgings
EN 14420-1:2013, Hose fittings with clamp units - Part 1: Requirements, types of fixing and connection,
designation and testing
EN 14420-2, Hose fittings with clamp units - Part 2: Hose side parts of hose tail
EN 14420-5, Hose fittings with clamp units - Part 5: Threaded connections
EN 22768-1, General tolerances - Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications (ISO 2768-1)
EN 22768-2 , General tolerances - Part 2: Geometrical tolerances for features without individual tolerance
indications (ISO 2768-2)
EN ISO 8330, Rubber and plastics hoses and hose assemblies - Vocabulary (ISO 8330)
ISO 272, Fasteners — Hexagon products — Widths across flats

1 bar = 0,1 MPa.
EN 22768-2 has been withdrawn and replaced by EN ISO 22081.
oSIST prEN 14420-7:2026
prEN 14420-7:2025 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 8330 and the following
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/
3.1
DN
nominal size
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes, comprised of the letters DN followed by a dimensionless whole number which is indirectly
related to the physical size, in millimetres, of the bore or outside diameter of the end connections
Note 1 to entry: The number following the letters DN does not represent a measurable value and is not be used
for calculation purposes except where specified in the relevant standard.
Note 2 to entry: In those standards which use the DN designation system, any relationship between DN and
component dimensions is to be indicated, e.g. DN/OD or DN/ID.
[SOURCE: EN ISO 6708:1995, 2.1, modified]
3.2
PN
alphanumeric designation used for reference purposes related to a combination of mechanical and
dimensional characteristics of a component of a hose fitting
Note 1 to entry: It comprises the letters PN followed by a dimensionless number.
Note 2 to entry: The number following the letters PN does not represent a measurable value and should not be
used for calculation purposes except where specified in the relevant standard.
3.3
main gasket
interface gasket between the male and female part of a coupling
3.4
thread gasket
flat faced gasket for threads according to EN ISO 228-1
4 Requirements
4.1 Construction
The curves of the lever and the adapters as well as the dimensions of the main gaskets shall be
harmonized such that twisting of the hose and vibrating during operation shall not lead to leakage. Cam
arms shall be manually operable.
Cam arms shall be suitable to operate without using tools.
For gauges for cam-locking couplings according to this document see Annex A.
oSIST prEN 14420-7:2026
prEN 14420-7:2025 (E)
NOTE If the requirements of this document are met, compatibility between couplers and adapters from
different manufacturers is ensured. Apart from gaskets, the interchangeability between spare parts from different
manufacturers cannot be ensured.
4.2 Temperatures
Range of working temperatures of couplings equipped with nitrile butadiene rubber gasket
(NBR-gasket): −20 °C to +65 °C.
5 Survey
Figure 1 and Figure 2 show examples for cam-locking couplings. A parts list is given in Table 1.

NOTE Chain optional.
Figure 1 — Coupler type DF and adapter type DP (dust plug)
oSIST prEN 14420-7:2026
prEN 14420-7:2025 (E)
NOTE Chain optional.
Figure 2 — Coupler type DC and ad
...