T11
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
4300
Catalog
General Technical
Application
Connector Proliferation
Today many different types of connectors are being used
around the world. Most of thesehave come about through
historical use and local preference for a certain design
concept. Some connections of the North American
origin such as four bolt flange, SAE straight thread and
37
°Flare have found some degree of acceptance and use in
Europe and Japan as a result of the exports of U.S.
machinery to the regions after World War II. But, large
majority of usage is made up of a variety of indigenous port
and tube connections. A quick review of the commonly
used connections around the world reveals that there are
eight different port connections and eleven different tube/
hose connection
s.
Port Connections
NPTF
ISO 6149 (Metric Straight
SAE Straight Thread (UN/UNF) Thread O-Ring Port)
4-
Bolt Flange
JIS-PT (BSPT)
ISO 1179 (BSPP)
JIS-B2351 (BSPP similar
ISO 9974 (Metric)
to SAE)
Tube/Hose Connections:
37
°Flare (SAE)
30
°Flare, BSPP (JIS)
24
°Flareless, Inch Threads (SAE) 24°Flareless, Metric (JIS)
60
° Cone Swivel, NPSM (SAE) 60° Cone, BSPP (JIS)
O-Ring Face Seal (SAE)
60
° Cone, Metric (JIS)
24
° Cone, Metric (DIN)
37
°Flare, Metric (Russia)
60
° Cone, BSPP (BSi)
The Challenge
Leakage is no longer acceptable in world class products.
Above proliferation, besides limiting availability and increasing
cost, increases leakage potential through misapplications.
Therefore, the challenge facing the fluid power industry is
two fold — eliminate leakage and minimize proliferation.
Meeting The Challenge
This challenge has been met through a very intensive
and cooperative effort by the member nations of
Application
Port
Tube/Hose Connection
24
° Cone Flareless
(
DIN) (Bite Type)
37
°Flare
(
Inch Threads)
ORFS
24
° Cone
Weld Nipple
For All Designs
Metric
ISO 6149
(
SAE J2244)
ISO 8434-1
ISO 8434-2
ISO 8434-3
ISO 8434-4*
Not for New Designs in Hydraulic
Fluid Power
Metric
ISO 1179
(
DIN 3852-2)
ISO 8434-1
ISO 8434-2
——
ISO 8434-4*
Metric
ISO 9974
(
DIN 3852-1)
ISO 8434-1
——
——
ISO 8434-4*
UN/UNF
ISO 11926
(
SAE J1926)
——
ISO 8434-2
——
__
sub-
c
ommittee 4 of the ISO Technical Committee 131 (ISO/
TC131) The sub-committee started this effort in 1989
and has completed development of performance based
standards for the most widely used ports and tube/
hose connections to limit proliferation, and strongly
endorsing those with elastomeric seals to eliminate
leakage in hydraulic systems.
Ten ports, eight threaded and two four bolt flange, and
four tube/ hose connections as shown on page
T12
have been standardized. The threaded ports and tube/
hose connections are paired in the ISO 8434 series of fitting
standards as defined in the table below.
To minimize proliferation in port usage and promote leak free
connections, the sub-committee strongly endorses use of
ISO 6149 port for all new designs by including the following
statement in all port standards:
“
For threaded ports and stud ends specified in new
designs in hydraulic fluid power applications, only
ISO 6149 shall be used. Threaded ports and stud
ends in accordance with ISO 1179, ISO 9974 and
ISO 11926 shall not be used for new designs in hy-
draulic fluid power applications.”
On the tube/hose connection side, only ISO 8434-3 (O-Ring
Face Seal) and ISO 8434-4 (24° cone with weld nipple) feature
elastomeric seal for zero leak performance. Combining
these with the ISO 6149 for the port connection leads to
two (2) combinations (complete fittings) for use in leak-free
world class products. They are:
ISO 8434-3
O-Ring Face Seal and
ISO6149 Port
ISO 8434-4
24
° Cone With Soft Seal
and ISO 6149 Port
For large port connections, the four bolt flange connection
per ISO 6162 (SAE J518 is included in ISO 6162) remains
widely used and the recommended connection.
Table T9 — ISO Standard Port and Tube/Hose Connection Combinations
*
Will be included in ISO 8434-1 at the next revision.
A
Dimensions and pressures for reference only, subject to change.
link