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GC550AJ31 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

GC550AJ31: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, leg_length: 1.570 INCHES NOMINAL IN, thread_class: 3B ALL ENDS, overall_length: 2.460 INCHES NOMINAL IN, connection_type: EXTERNAL QUICK DISCONNECT ALL ENDS, connection_style: BOSS GASKET SEAL ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-217-5442, 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
GC550AJ31
NSN: 4730-00-217-5442
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL BODY
leg_length1.570 INCHES NOMINAL IN
thread_class3B ALL ENDS
overall_length2.460 INCHES NOMINAL IN
connection_typeEXTERNAL QUICK DISCONNECT ALL ENDS
connection_styleBOSS GASKET SEAL ALL ENDS
style_designatorMALE COUPLING HALF
features_providedSELF-SEALING
surface_treatmentPASSIVATE BODY
nominal_thread_size1.062 INCHES ALL ENDS IN
quick_disconnect_methodPUSH-PULL ALL ENDS
thread_quantity_per_inch12 ALL ENDS
NSN4730-00-217-5442
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC550AJ31 · 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: BOSS GASKET SEAL ALL ENDS
•
CONNECTION TYPE: THREADED INTERNAL BOSS FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE BODY
•
LEG LENGTH: 1.570 INCHES NOMINAL IN
•
FEATURES PROVIDED: SELF-SEALING
TECHNICAL CHARACTERISTICS
CONNECTION STYLEBOSS GASKET SEAL ALL ENDS
CONNECTION TYPETHREADED INTERNAL BOSS FIRST FLUID END CONNECTION
CONNECTION TYPEEXTERNAL QUICK DISCONNECT ALL ENDS
STYLE DESIGNATORMALE COUPLING HALF
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE BODY
OVERALL LENGTH2.460 INCHES NOMINAL IN
LEG LENGTH1.570 INCHES NOMINAL IN
FEATURES PROVIDEDSELF-SEALING
NOMINAL THREAD SIZE1.062 INCHES ALL ENDS IN
SURFACE TREATMENTPASSIVATE 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 1
S6VHN12-12-49Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 GC550AJ31?
GC550AJ31 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace GC550AJ31?
There is 1 known substitute for GC550AJ31: S6VHN12-12-49. Substitute compatibility should be verified for your specific system.
What is the NSN for GC550AJ31?
GC550AJ31 is cataloged in the U.S. Government catalog under NSN 4730-00-217-5442. 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.