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GC550LC — NUT ASSEMBLY,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

GC550LC: NUT ASSEMBLY,TUBE COUPLING.

The NUT ASSEMBLY,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024, thread_size: 2.188-16, thread_class: 2B, overall_length: 0.599 INCHES MINIMUM AND 0.701 INCHES MAXIMUM IN, outside_diameter: 2.324 INCHES MINIMUM AND 2.407 INCHES MAXIMUM IN, style_designator: NUT ASSEMBLY. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-059-1311, 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
GC550LC
NSN: 4730-01-059-1311
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024
thread_size2.188-16
thread_class2B
overall_length0.599 INCHES MINIMUM AND 0.701 INCHES MAXIMUM IN
outside_diameter2.324 INCHES MINIMUM AND 2.407 INCHES MAXIMUM IN
style_designatorNUT ASSEMBLY
thread_directionRIGHT-HAND
surface_treatmentANODIZE
end_item_identificationGRUMMAN AEROSPACE CORP,AIRFRAME,MODEL A5/-60000
working_temp_and_service_type160.0 DEG FAHRENHEIT NOMINAL AIR
screw_thread_series_designatorUNS
working_pressure_and_service_type375.0 POUNDS PER SQUARE INCH (PSI) NOMINAL AIR LBS
NSN4730-01-059-1311
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC550LC · 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
•
WORKING TEMP AND SERVICE TYPE: 160.0 DEG FAHRENHEIT NOMINAL AIR
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 1.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NUT ASSEMBLY
•
OUTSIDE DIAMETER: 2.324 INCHES MINIMUM AND 2.407 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD SIZE: 2.188-16
•
SCREW THREAD SERIES DESIGNATOR: UNS
TECHNICAL CHARACTERISTICS
WORKING TEMP AND SERVICE TYPE160.0 DEG FAHRENHEIT NOMINAL AIR
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED1.500 INCHES NOMINAL IN
STYLE DESIGNATORNUT ASSEMBLY
OVERALL LENGTH0.599 INCHES MINIMUM AND 0.701 INCHES MAXIMUM IN
OUTSIDE DIAMETER2.324 INCHES MINIMUM AND 2.407 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
THREAD SIZE2.188-16
SCREW THREAD SERIES DESIGNATORUNS
SURFACE TREATMENTANODIZE
THREAD CLASS2B
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 1
GC550LC24AFSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 GC550LC?
GC550LC is a NUT ASSEMBLY,TUBE COUPLING.
What parts can replace GC550LC?
There is 1 known substitute for GC550LC: GC550LC24AF. Substitute compatibility should be verified for your specific system.
What is the NSN for GC550LC?
GC550LC is cataloged in the U.S. Government catalog under NSN 4730-01-059-1311. 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.