ISO 8434-2:2007
Metallic tube connections for fluid power and general use - Part 2: 37° flared connectors

Standard No.

ISO 8434-2:2007

Release Date

2007

Published By

International Organization for Standardization (ISO)

Latest

ISO 8434-2:2007

Scope

This part of ISO 8434 specifies general and dimensional requirements for the design and performance of 37° flared connectors that are suitable for use with ferrous and non-ferrous tubes with outside diameters from 6 mm to 50,8 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 tubes and hose fittings to ports in accordance with ISO 6149-1, ISO 1179-1, ISO 9974-1 and ISO 11926-1. (See ISO 12151-5 for related hose fitting specification.) These connectors provide full-flow connections with metal-to-metal sealing 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 shall not be understood as guaranteed minimums. For every application, sufficient testing will need to be conducted and the results 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 5.5. Both metric and inch tubing can be accommodated by changing the sleeve (see Figure 7). 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 37° flared connectors.

ISO 8434-2:2007 Referenced Document

• ISO 10763 Hydraulic fluid power — Plain-end, seamless and welded precision steel tubes — Dimensions and nominal working pressures*， 2020-06-26 Update
• ISO 1127 Stainless steel tubes; dimensions, tolerances and conventional masses per unit length
• ISO 1179-1 Connections for general use and fluid power.Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing.Part 1: Threaded ports*， 2013-11-01 Update
• ISO 1179-2 Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing — Part 2: Heavy-duty (S series) and light-duty (L series) stud ends*， 2022-11-10 Update
• ISO 1179-3 Connections for general use and fluid power - Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing - Part 3: Light-duty (L series) stud ends with sealing by O-ring with retaining ring (types G and H)
• ISO 1179-4 Connections for general use and fluid power - Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing - Part 4: Stud ends for general use only with metal-to-metal sealing (type B)
• ISO 11926-1 Connections for general use and fluid power - Ports and stud ends with ISO 725 threads and O-ring sealing - Part 1: Ports with O-ring seal in truncated housing
• ISO 228-1:2000 Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation
• ISO 261 ISO general purpose metric screw threads - General plan
• ISO 263 ISO inch screw threads; General plan and selection for screws, bolts and nuts; Diameter range 0,06 to 6 in
• ISO 3304 Plain end seamless precision steel tubes; Technical conditions for delivery
• ISO 3305 Plain end welded precision steel tubes; Technical conditions for delivery
• ISO 4759-1:2000 Tolerances for fasteners - Part 1: Bolts, screws, studs and nuts - Product grades A, B and C
• ISO 5598 Fluid power systems and components — Vocabulary*， 2020-01-06 Update
• ISO 5864:1993 ISO inch screw threads; allowances and tolerances
• ISO 6149-1 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*， 2022-06-13 Update
• ISO 6149-3 Connections for hydraulic fluid power and general use - Ports and stud ends with ISO 261 metric threads and O-ring sealing - Part 3: Dimensions, design, test methods and requirements for light-duty (L series) stud ends
• ISO 68-2 ISO general purpose screw threads — Basic and design profiles — Part 2: Inch screw threads*， 2023-09-01 Update
• ISO 9227 Corrosion tests in artificial atmospheres — Salt spray tests — Amendment 1: Footnote of Warning*， 2024-02-19 Update
• ISO 9974-1 Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 1: Threaded ports
• ISO 9974-2 Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 2: Stud ends with elastomeric sealing (type E)
• ISO 9974-3:1996 Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 3: Stud ends with metal-to-metal sealing (type B)

ISO 8434-2:2007 history

• 2007 ISO 8434-2:2007 Metallic tube connections for fluid power and general use - Part 2: 37° flared connectors
• 1994 ISO 8434-2:1994 Metallic tube fittings for fluid power and general use - Part 2: 37° flared fittings