INCH-POUND
MIL-DTL-25427B
15 May 2009
SUPERSEDING
MIL-C-25427A
16 Sept 1960
DETAIL SPECIFICATION
COUPLING ASSEMBLY, HYDRAULIC, SELF SEALING,
QUICK DISCONNECT, GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments and Agencies of the
Department of Defense.
1. SCOPE
1.1 Scope. This specification covers the detailed requirements for aircraft hydraulic self
sealing quick disconnect coupling for use in types I and II hydraulic systems (-65 °F to +275 °F
temperature range) as defined by SAE-AS5440.
1.2 Classification. Hydraulic self-sealing, quick disconnect couplings may be one of the
following classes, as specified (see 6.2):
Class 1000- 1000 pounds per square inch (psi) rated pressure furnished in
1.25 to 1.5 inch tube sizes (return lines).
Class 3000- 3000 psi rated pressure furnished in 0.25 through 1 inch tube sizes
(1.25 and 1.5 inch tube sizes are for return lines only).
Class 5000- 5000 psi rated pressure furnished in 0.25 to 1 inch tube sizes
(1.25 and 1.5 inch tube sizes are for return lines only).
1.2.1 Part or identifying number (PIN). The part or identifying number to be used for
couplings acquired to this specification is identified in the applicable specification sheet.
Comments, suggestions, or questions on this document should be addressed to the
Naval Air Systems Command, Attention: Code 4L8000B120-3, Highway 547, Lakehurst,
NJ 08733-5100 or emailed to michael.sikora@navy.mil. Since contact information can
change, you may want to verify the currency of this address information using the ASSIST
online database at https://assist.daps.dla.mil.
AMSC N/A
FSC 4730
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