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ISO 8434-2 vs SAE J514 standard pdf

Date:Jun 09, 2019


ISO 8434-2 and SAE J514 is different standard for the same product: hydraulic tube fittings with 37 degree flared and flareless types connector end, also called jic hydraulic fittings.


ISO 8434 is based on the US standard ANSI/SAE J514 [1] . The threads for the 37° flared

connection are unified inch threads in accordance with ISO 263. The inch threads were not changed to metric threads according to ISO 261 to allow connectors complying with this International Standard to be used in existing applications without requiring a change to tube or hose assemblies. So, it also called UNF hydraulic fittings.


ISO 8434-2 is Metallic tube connections for fluid power and general use — Part 2: 37° flared connectors. It is also ISO hydraulic fittings.  

SAE J514 is Hydraulic Tube Fittings J514_201201, also is SAE hydraulic fittings.


ISO 8434-2 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.)


SAE J514 Standard covers complete general and dimensional specifications for 37 degree flared and flareless types of hydraulic tube fittings and O-ring plugs. Also included are pipe fittings and adapter unions for use in conjunction with these tube fittings. These fittings are intended for general application in hydraulic systems on industrial equipment and commercial products.

These fittings are capable of providing leakproof, full flow connections in hydraulic systems operating at working pressures


The SAE J514 standard is divided into six sections as follows:

Section 1—37 Degree Flare Tube Fittings

Section 2—Flareless Tube Fittings

Section 3—O-ring Plugs (for O-ring Ports see SAE J1926)

Section 4—Hydraulic Pipe Fittings (formerly SAE J926)

Section 5—Adapter Unions (formerly in SAE J516)

Section 6—Tables for Calculating Dimensions on Special Sizes


SO 8434-2  Contents  Page

Foreword..Introduction

1 Scope

2 Normative references

3 Terms and definitions

4 Requirements for materials

5 Pressure/temperature requirements

6 Designation of connectors

7 Requirements for tubes.

8 Across flats dimensions and tolerances

9 Design…

10 Screw threads

11 Manufacture

12 Assembly instructions

13 Procurement information

15 Performance and qualification test.

16 Identification statement (reference to this part of ISO 8434)

Annex A (normative) Length reduction factors for reducing connectors


Normative references

ISO 68-2, ISO general-purpose screw threads –– Basic profile –– Part 2: Inch screw threads

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 BS ISO 8434-2:2007

ISO 1127, Stainless steel tubes — Dimensions, tolerances and conventional masses per unit length

ISO 1179-1 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

ISO 1179-2:— 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 2: Heavy-duty (S series) and light-duty (L series) stud ends with elastomeric sealing (type E)

ISO 1179-3:–– 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 3: Light-duty (L series) stud ends with sealing by O-ring with retaining ring (types G and H)

ISO 1179-4:— 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 4: Stud ends for general use only with metal-to-metal sealing (type B)

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

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: Port with truncated housing for O-ring seal

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 9227, Corrosion tests in artificial atmospheres — Salt spray tests

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 10763, Hydraulic fluid power — Plain-end seamless and welded precision steel tubes — Dimensions and nominal working pressures

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 11926-3:1995, Connections for general use and fluid power — Ports and stud ends with ISO 725 threads and O-ring sealing — Part 3: Light-duty (L series) stud ends



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