Page 458 - 4300 Catalog Cover.pdf

U6 Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
4300 Catalog General Technical
Connectors For World Class
Products
Connector Proliferation:
Todaymany different types of connectors are being used around
the world.Most of these have come about through historical use
and local preference for a certain design concept. Some con-
nections 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 WorldWar 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
connectionsaround theworld reveals that thereareeight different
port connections and eleven different tube/hose connections.
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 throughmisapplications.Therefore,
the challenge facing the fluid power industry is two fold — elimi-
nate leakage and minimize proliferation.
Meeting The Challenge:
This challenge has been met through a very intensive and co-
operative effort by themember nations of sub-committee 4 of the
ISOTechnical Committee 131 (ISO/TC131).The subcommittee
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.
Five ports, four threaded and the four bolt flange, and four tube/
hose connections as shown on the following page (Fig.U1) have
been standardized. The threaded ports and tube/hose connec-
tions 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 state-
ment in all port standards:
“For threaded ports and stud ends specified in new
designs inhydraulicfluidpower 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 hydraulic 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 ISO 6149 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 U1 — ISO Standard Port and Tube/Hose Connection Combinations
* Will be included in ISO 8434-1 at the next revision.
Tube/Hose Connection
24° Cone
Flareless (DIN) 37° Flare 24° Cone
Application Port (Bite Type) (Inch Threads) ORFS Weld Nipple
Metric
For All Designs ISO 6149 ISO 8434-1 ISO 8434-2 ISO 8434-3 ISO 8434-4*
(SAE J2244)
BSPP
ISO 1179 ISO 8434-1 ISO 8434-2 — ISO 8434-4*
(DIN 3852-2)
Not for New
Designs in Metric
Hydraulic Fluid ISO 9974 ISO 8434-1 — — ISO 8434-4*
Power (DIN 3852-1)
UN/UNF
ISO 11926 — ISO 8434-2 — —
(SAE J1926)
Dimensions and pressures for reference only, subject to change.