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PartsTable / COMPONENT / GC550EG4N
GC550EG4N ✓ 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 NUT ASSEMBLY,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024, thread_size: 3/4-12, thread_class: 2B, overall_length: 0.418 INCHES NOMINAL IN, outside_diameter: 0.829 INCHES NOMINAL IN, special_features: W/ALUMINUM RETAINING RING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-484-2640, 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
GC550EG4N
NSN: 4730-00-484-2640
FSC: 4730
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024
thread_size3/4-12
thread_class2B
overall_length0.418 INCHES NOMINAL IN
outside_diameter0.829 INCHES NOMINAL IN
special_featuresW/ALUMINUM RETAINING RING
style_designatorNUT ASSEMBLY
thread_directionRIGHT-HAND
surface_treatmentANODIZE
end_item_identification10N AIRCRAFT, TOMCAT F-14A A
screw_thread_series_designatorUN
tube_outside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN4730-00-484-2640
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC550EG4N · 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
•
THREAD CLASS: 2B
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
SCREW THREAD SERIES DESIGNATOR: UN
•
OUTSIDE DIAMETER: 0.829 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
STYLE DESIGNATOR: NUT ASSEMBLY
•
MATERIAL: ALUMINUM ALLOY 2024
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
SCREW THREAD SERIES DESIGNATORUN
OUTSIDE DIAMETER0.829 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
SPECIAL FEATURESW/ALUMINUM RETAINING RING
STYLE DESIGNATORNUT ASSEMBLY
MATERIALALUMINUM ALLOY 2024
SURFACE TREATMENTANODIZE
END ITEM IDENTIFICATION10N AIRCRAFT, TOMCAT F-14A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
830534Interchangeable
interchangeable cross-reference
interchangeable
755002A7654-34Interchangeable
interchangeable cross-reference
interchangeable
2723-34Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GC550EG4N?
GC550EG4N is a NUT ASSEMBLY,TUBE COUPLING.
What parts can replace GC550EG4N?
There are 3 known substitutes for GC550EG4N: 830534, 755002A7654-34, 2723-34. Substitute compatibility should be verified for your specific system.
What is the NSN for GC550EG4N?
GC550EG4N is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-484-2640. 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