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GC550MP4M — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

GC550MP4M: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY BODY, leg_length: 0.788 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN, seat_angle: 37.0 DEGREES, thread_class: 3B ALL ENDS, overall_length: 1.428 INCHES MINIMUM AND 1.453 INCHES MAXIMUM IN, connection_type: THREADED INTERNAL TUBE FIRST FLUID END CONNECTION. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-353-0584, 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
GC550MP4M
NSN: 4730-01-353-0584
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY BODY
leg_length0.788 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN
seat_angle37.0 DEGREES
thread_class3B ALL ENDS
overall_length1.428 INCHES MINIMUM AND 1.453 INCHES MAXIMUM IN
connection_typeTHREADED INTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleSWIVEL NUT, FLARED ALL ENDS
style_designatorMALE COUPLING HALF
surface_treatmentANODIZE BODY
nominal_thread_size0.438 INCHES ALL ENDS IN
quick_disconnect_methodSPRING PUSH-PULL FIRST QUICK DISCONNECT END
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NSN4730-01-353-0584
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC550MP4M · 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
•
CONNECTION STYLE: SWIVEL NUT, FLARED ALL ENDS
•
CONNECTION TYPE: THREADED INTERNAL TUBE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE BODY
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
LEG LENGTH: 0.788 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLESWIVEL NUT, FLARED ALL ENDS
CONNECTION TYPETHREADED INTERNAL TUBE FIRST FLUID END CONNECTION
STYLE DESIGNATORMALE COUPLING HALF
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE BODY
OVERALL LENGTH1.428 INCHES MINIMUM AND 1.453 INCHES MAXIMUM IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
LEG LENGTH0.788 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
SEAT ANGLE37.0 DEGREES
SURFACE TREATMENTANODIZE BODY
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GC550MP4M?
GC550MP4M is a COUPLING HALF,QUICK DISCONNECT.
What is the NSN for GC550MP4M?
GC550MP4M is cataloged in the U.S. Government catalog under NSN 4730-01-353-0584. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.