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Dixon Quick Coupling 877-963-4966 73
Understanding Flushface Products
Customer
Asks For
This SIze
1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
Understanding Flushface Sizing Policies
Typically Means
They Want This
(ISO Body Size x Thread)
1/4" x 1/4"
3/8" x 3/8"
1/2" x 1/2"
5/8" x 3/4"
3/4" x 1"
1" x 1-1/4"
European System
Customer
Asks For
This SIze
Typically Means
They Want This
(ISO Body Size x Thread)
1/4" x 1/4"
3/8" x 3/8"
3/8" x 1/2"
1/2" x 3/4"
3/4" x 1"
1" x 1-1/4"
UK System
Customer
Asks For
This SIze
1/4"
3/8"
1/2"
5/8"
3/4"
1"
Typically Means
They Want This
(ISO Body Size x Thread)
1/4" x 1/4"
3/8" x 3/8"
1/2" x 1/2"
5/8" x 3/4"
3/4" x 3/4"
1" x 1"
ISO16028 System
Using The Nipple Profile Tolerances To Select Proper Size
Using The Profile Layover To Select Proper Size
Note: For assistance to select the proper coupling, please call the factory at 877-963-4966.
Flushface couplings continue to be one of the most confusing products to
interchange, even though the ISO16028 standard was supposed to clarify
this for our industry. The main reasons for the confusion are as follows:
• There are still many ‘Old-Style’ flushface couplings in the market that are
close in size, and may fit in some instances, but are not designed to
interchange. For example, Parker FF752 will sometimes fit an ISO16028
coupler, even though it is not ISO compliant.
• Several manufacturers, especially those based in Europe, do not follow
the ISO sizing recommendations.
• Some manufacturers have ISO16028 interchange couplings mixed with
proprietary non-interchange couplings. For example, the Parker FF-Series
3/8" couplings are interchangeable to the ISO16028 standard, but the rest
of the series is not.
• The industry has couplings that are dimensionally interchangeable to
ISO16028 but are not fully compliant with all aspects of the performance
requirements in the ISO16028 standard.
1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
ISO16028
Body Size
1/4"
3/8"
1/2"
5/8"
3/4"
1"
Minimum Dimension
'X' Measurement
16.10mm (0.634")
19.66mm (0.774")
24.45mm (0.963")
26.95mm (1.061")
29.87mm (1.176")
35.94mm (1.415")
Maximum Dimension
'X' Measurement
16.20mm (0.638")
19.79mm (0.779")
24.58mm (0.968")
27.08mm (1.066")
30.00mm (1.181")
36.07mm (1.420")
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