BS EN ISO 8434-1:2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
   4.1 General
   4.2 Connector bodies
   4.3 Nuts
   4.4 Cutting rings
   4.5 O-rings
5 Pressure/temperature requirements
6 Designation of connectors
7 Requirements for tubes
8 Across-flats dimensions and tolerances
9 Design
   9.1 Connectors
   9.2 Dimensions
   9.3 Passage tolerances
   9.4 Angular tolerances
   9.5 Contour details
   9.6 Ports and stud ends
   9.7 Stud end sealing
10 Screw threads
   10.1 Cone ends and nuts
   10.2 Stud ends (connection ends)
11 Manufacture
   11.1 Construction
   11.2 Workmanship
   11.3 Finish
   11.4 Corners
12 Assembly instruction
13 Procurement information
14 Marking of components
15 Performance and qualification test
   15.1 General
   15.2 Repeated assembly test
   15.3 Proof test
   15.4 Burst pressure test
   15.5 Cyclic endurance (impulse) test
   15.6 Vibration test
   15.7 Leakage (gas) test
   15.8 Overtightening test
16 Identification statement (reference to this part
   of ISO 8434)
Bibliography

Describes the general and dimensional requirements for 24 degree cone connectors using cutting ring and O-ring seal cone (referred to as DKO) suitable for use with ferrous and non-ferrous tubes with outside diameters from 4 mm to 42 mm inclusive.

This part of ISO 8434 specifies the general and dimensional requirements for 24° cone connectors using cutting ring and O-ring seal cone (referred to as DKO) suitable for use with ferrous and non-ferrous tubes with outside diameters from 4 mm to 42 mm inclusive. These connectors are for use in fluid power and general applications within the limits of pressure and temperature specified in this part of ISO 8434.

They are intended for the connection of plain end tubes and hose fittings to ports in accordance with ISO 6149-1, ISO 1179-1 and ISO 9974-1. (See ISO 12151-2 for related hose fitting specification.)

These connectors provide full-flow connections in hydraulic systems operating to the working pressures shown in Table 1. Because many factors influence the pressure at which a system performs satisfactorily, these values are not to be understood as guaranteed minimums. For every application, sufficient testing will need to be conducted and reviewed by both the user and manufacturer to ensure that required performance levels are met.

NOTE 1 For new designs in hydraulic fluid power applications, see the requirements given in 9.6. Where the requirements of the application allow for the use of elastomeric seals, connector designs that conform to International Standards and incorporate elastomeric sealing are preferred.

NOTE 2 For use under conditions outside the pressure and/or temperature limits specified, see 5.4.

This part of ISO 8434 also specifies a performance and qualification test for these connectors.