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Technical Data Sheet
PartsTable / COMPONENT / 390509-4
390509-4 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY BODY, leg_length: 0.550 INCHES NOMINAL IN, seat_angle: 37.0 DEGREES, thread_class: 3A ALL ENDS A, overall_length: 2.040 INCHES NOMINAL IN, connection_type: INTERNAL QUICK DISCONNECT ALL ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-038-2351, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
390509-4
NSN: 4730-01-038-2351
FSC: 4730
CAGE: 00624 — EATON AEROQUIP LLC DBA JACKSON NORTH 1 DIV FLUID AND ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY BODY
leg_length0.550 INCHES NOMINAL IN
seat_angle37.0 DEGREES
thread_class3A ALL ENDS A
overall_length2.040 INCHES NOMINAL IN
connection_typeINTERNAL QUICK DISCONNECT ALL ENDS
connection_styleFLARED ALL ENDS
style_designatorMALE COUPLING HALF
nominal_thread_size0.438 INCHES ALL ENDS IN
quick_disconnect_methodPUSH-PULL ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
nominal_outside_diameter_tube_accommodated0.250 INCHES ALL ENDS IN
NSN4730-01-038-2351
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 390509-4 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SEAT ANGLE: 37.0 DEGREES
•
QUICK DISCONNECT METHOD: PUSH-PULL ALL ENDS
•
CONNECTION STYLE: FLARED ALL ENDS
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
•
STYLE DESIGNATOR: MALE COUPLING HALF
TECHNICAL CHARACTERISTICS (FLIS)
SEAT ANGLE37.0 DEGREES
QUICK DISCONNECT METHODPUSH-PULL ALL ENDS
CONNECTION STYLEFLARED ALL ENDS
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
STYLE DESIGNATORMALE COUPLING HALF
LEG LENGTH0.550 INCHES NOMINAL IN
MATERIALALUMINUM ALLOY BODY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
C-6529Interchangeable
interchangeable cross-reference
interchangeable
T362B226M025ASInterchangeable
interchangeable cross-reference
interchangeable
196D1117Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 390509-4?
390509-4 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 390509-4?
There are 3 known substitutes for 390509-4: C-6529, T362B226M025AS, 196D1117. Substitute compatibility should be verified for your specific system.
What is the NSN for 390509-4?
390509-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-038-2351. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026