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PartsTable / COMPONENT / GC550C20
GC550C20 ✓ 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

COUPLING ASSEMBLY,TUBE,FLEXIBLE. Key specifications include material: ALUMINUM ALLOY 2024, overall_length: 2.609 INCHES MAXIMUM IN, outside_diameter: 3.820 INCHES MINIMUM AND 3.969 INCHES MAXIMUM IN, special_features: NSN IS A CRITICAL SAFETY ITEM (CSI), style_designator: FLEXIBLE COUPLING ASSEMBLY, end_item_identification: GRUMMAN AEROSPACE CORP A10 AIRCRAFT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-303-6103, 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
GC550C20
NSN: 4730-00-303-6103
FSC: 4730
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024
overall_length2.609 INCHES MAXIMUM IN
outside_diameter3.820 INCHES MINIMUM AND 3.969 INCHES MAXIMUM IN
special_featuresNSN IS A CRITICAL SAFETY ITEM (CSI)
style_designatorFLEXIBLE COUPLING ASSEMBLY
end_item_identificationGRUMMAN AEROSPACE CORP A10 AIRCRAFT
working_temp_and_service_type65.0 DEG FAHRENHEIT MINIMUM JET FUEL AND 400.0 DEG FAHRENHEIT MAXIMUM JET FUEL
criticality_code_justificationFEAT
tube_outside_diameter_for_which_designed3.000 INCHES NOMINAL IN
NSN4730-00-303-6103
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC550C20 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
AS5356-32D1Interchangeable
interchangeable cross-reference
interchangeable
SAE AS5356Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-85061Interchangeable
interchangeable cross-reference
interchangeable
12J36-40AInterchangeable
interchangeable cross-reference
interchangeable
3605-40DInterchangeable
interchangeable cross-reference
interchangeable
0130-00-12-12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GC550C20?
GC550C20 is a COUPLING ASSEMBLY,TUBE,FLEXIBLE.
What parts can replace GC550C20?
There are 29 known substitutes for GC550C20: AS5356-32D1, SAE AS5356, MIL-DTL-85061 and 26 more. Substitute compatibility should be verified for your specific system.
Is GC550C20 still available?
GC550C20 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026