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4221781 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4221781: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, overall_length: 1.80 INCHES NOMINAL IN, connection_type: THREADED INTERNAL BOSS FIRST FLUID END CONNECTION, connection_style: GROOVED FIRST QUICK DISCONNECT END, special_features: FLOW RATE 0.8 (GPM), basic_shape_style: OCTAGON W/OUT BOLT HOLES FIRST QUICK DISCONNECT END. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-685-8531, 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
4221781
NSN: 4730-01-685-8531
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL BODY
overall_length1.80 INCHES NOMINAL IN
connection_typeTHREADED INTERNAL BOSS FIRST FLUID END CONNECTION
connection_styleGROOVED FIRST QUICK DISCONNECT END
special_featuresFLOW RATE 0.8 (GPM)
basic_shape_styleOCTAGON W/OUT BOLT HOLES FIRST QUICK DISCONNECT END
surface_treatmentCHROMATE ZINC BODY
operating_pressure6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.375 INCHES FIRST FLUID END CONNECTION IN
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
end_item_identificationNSN 2320-015341091
thread_quantity_per_inch24 FIRST FLUID END CONNECTION
NSN4730-01-685-8531
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4221781 · 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
•
NOMINAL WIDTH ACROSS FLATS: 0.69 INCHES IN
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL FIRST FLUID END CONNECTION
•
CONNECTION TYPE: THREADED INTERNAL BOSS FIRST FLUID END CONNECTION
•
OPERATING PRESSURE: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
QUICK DISCONNECT NOMINAL SIZE: 0.125 INCHES FIRST QUICK DISCONNECT END IN
TECHNICAL CHARACTERISTICS
NOMINAL WIDTH ACROSS FLATS0.69 INCHES IN
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL FIRST FLUID END CONNECTION
CONNECTION STYLEGROOVED FIRST QUICK DISCONNECT END
CONNECTION TYPETHREADED INTERNAL BOSS FIRST FLUID END CONNECTION
CONNECTION TYPEEXTERNAL QUICK DISCONNECT FIRST QUICK DISCONNECT END
OVERALL LENGTH1.80 INCHES NOMINAL IN
OPERATING PRESSURE6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
QUICK DISCONNECT NOMINAL SIZE0.125 INCHES FIRST QUICK DISCONNECT END IN
BASIC SHAPE STYLEOCTAGON W/OUT BOLT HOLES FIRST QUICK DISCONNECT END
NOMINAL THREAD SIZE0.375 INCHES FIRST FLUID END CONNECTION IN
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

No substitute or cross-reference records for this part.

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 4221781?
4221781 is a COUPLING HALF,QUICK DISCONNECT.
What is the NSN for 4221781?
4221781 is cataloged in the U.S. Government catalog under NSN 4730-01-685-8531. 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.