BS ISO 8434-3:2005
Current
The latest, up-to-date edition.
Metallic tube connections for fluid power and general use O-ring face seal connectors
Hardcopy , PDF
English
02-09-2005
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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 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 Stud ends
9.7 Reducing connectors
10 Screw threads
10.1 O-ring face seal
10.2 Stud ends (connection ends)
11 Manufacture
11.1 Construction
11.2 Workmanship
11.3 Finish
11.4 Connector protection
11.5 Corners
12 Assembly instruction
13 Procurement information
14 Marking of components
15 Performance and qualification test
15.1 Performance requirements
15.2 Test data form
16 Identification statement (reference to this part of
ISO 8434)
Annex A (normative) Specification for 1-14 UNS inch screw
threads - Basic dimensions
Annex B (normative) Reduction factors for reducing
connectors
Annex C (normative) Formed tube connection for ISO 8434-3
O-ring face seal connectors
Annex D (informative) O-ring face seal tube and hose
connections with metric or inch
tubing or swivel hose connector
Annex E (informative) Typical connections with O-ring face
seal connectors
Annex F (informative) Assembly instructions for adjustable
connectors in ISO 6149-1 ports
Specifies general and dimensional requirements for the design and performance of O-ring face seal fittings made of steel for tube outside diameters of hose inside diameters of 6 mm to 38 mm, inclusive.
| Committee |
MCE/18/-/4
|
| DevelopmentNote |
Supersedes 92/81673 DC. (03/2005) Supersedes 98/714984 DC. (09/2005)
|
| DocumentType |
Standard
|
| Pages |
72
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This part of ISO 8434 specifies the general and dimensional requirements for the design and performance of O-ring face seal connectors made of steel for tube outside diameters or hose inside diameters of 6 mm through 38 mm, inclusive. These connectors are for use in fluid power and general applications where elastomeric seals can be used to prevent fluid leakage, including leakage caused by variations in assembly procedures. They are intended for the connection of tubes and hose fittings to ports in accordance with ISO 6149-1. (See ISO 12151-1 for related hose fitting specification.)
These connectors provide leakproof, full-flow connections in hydraulic systems operating from a vacuum of 6,5 kPa [0,065 bar3)] absolute pressure to the working pressures shown in Table 1. Because many factors influence the pressure at which a system performs satisfactorily, these values shall not be understood as guaranteed minimums. For every application, it is recommended that sufficient testing be conducted and reviewed by both the user and manufacturer to ensure that required performance levels are met.
NOTE For use under conditions outside the pressure and/or temperature limits specified, see 5.3.
Both metric and inch tubing can be accommodated by changing the sleeve (see Annex D). In the past, these connectors have been used predominantly with inch tubing. For new and future designs, the use of metric tubing is preferred.
This part of ISO 8434 also specifies a performance and qualification test for O-ring face seal connectors.
| Standards | Relationship |
| ISO 8434-3:2005 | Identical |
| ISO 68-2:1998 | ISO general purpose screw threads — Basic profile — Part 2: Inch screw threads |
| ISO 8434-1:2007 | Metallic tube connections for fluid power and general use Part 1: 24 degree cone connectors |
| ISO 5598:2008 | Fluid power systems and components Vocabulary |
| ISO 4759-1:2000 | Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C |
| ISO 3305:1985 | Plain end welded precision steel tubes — Technical conditions for delivery |
| ISO 8434-2:2007 | Metallic tube connections for fluid power and general use — Part 2: 37 degree flared connectors |
| ISO 5864:1993 | ISO inch screw threads Allowances and tolerances |
| ISO 19879:2010 | Metallic tube connections for fluid power and general use Test methods for hydraulic fluid power connections |
| ISO 6149-2:2006 | Connections for hydraulic fluid power and general use Ports and stud ends with ISO 261 metric threads and O-ring sealing Part 2: Dimensions, design, test methods and requirements for heavy-duty (S series) stud ends |
| ISO 6149-1:2006 | Connections for hydraulic fluid power and general use Ports and stud ends with ISO 261 metric threads and O-ring sealing Part 1: Ports with truncated housing for O-ring seal |
| ISO 3304:1985 | Plain end seamless precision steel tubes — Technical conditions for delivery |
| ISO 9227:2017 | Corrosion tests in artificial atmospheres — Salt spray tests |
| ISO 261:1998 | ISO general purpose metric screw threads — General plan |
| ISO 12151-1:2010 | Connections for hydraulic fluid power and general use — Hose fittings — Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends |
| ISO 3601-3:2005 | Fluid power systems O-rings Part 3: Quality acceptance criteria |
| ISO 48:2010 | Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) |
| ISO 263:1973 | ISO inch screw threads General plan and selection for screws, bolts and nuts Diameter range 0,06 to 6 in |
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