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GC550KJ28A — COUPLING ASSEMBLY,TUBE,FLEXIBLE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

GC550KJ28A: COUPLING ASSEMBLY,TUBE,FLEXIBLE.

COUPLING ASSEMBLY,TUBE,FLEXIBLE. Key specifications include material: ALUMINUM ALLOY, flange_width: 0.066 INCHES NOMINAL IN, overall_length: 0.589 INCHES NOMINAL IN, style_designator: SINGLE FLANGE, flange_inside_diameter: 3.472 INCHES NOMINAL IN, casehardening_indicator: NOT CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-095-6118, 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
GC550KJ28A
NSN: 4730-01-095-6118
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
flange_width0.066 INCHES NOMINAL IN
slot_quantity6
overall_length0.589 INCHES NOMINAL IN
style_designatorSINGLE FLANGE
flange_inside_diameter3.472 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
flange_outside_diameter1.270 INCHES NOMINAL IN
sleeve_outside_diameter3.646 INCHES NOMINAL IN
hose/tube_outside_diameter_for_which_designed1.000 INCHES NOMINAL IN
NSN4730-01-095-6118
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC550KJ28A · 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
SUBSTITUTES & CROSS-REFERENCES 2
GC550KJReference document
Same NSN cross-reference
Reference document — Drawing number reference only
12J71-28AESame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GC550KJ28A?
GC550KJ28A is a COUPLING ASSEMBLY,TUBE,FLEXIBLE.
What parts can replace GC550KJ28A?
There are 2 known substitutes for GC550KJ28A: GC550KJ, 12J71-28AE. Substitute compatibility should be verified for your specific system.
What is the NSN for GC550KJ28A?
GC550KJ28A is cataloged in the U.S. Government catalog under NSN 4730-01-095-6118. 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.