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668066 — RESTRICTOR UNIT,FLUID FLOW

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

668066: RESTRICTOR UNIT,FLUID FLOW.

The RESTRICTOR UNIT,FLUID FLOW is a the manufacturer industrial component. Key specifications include special_features: USED ON KC135. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-509-4889, 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
668066
NSN: 4730-00-509-4889
NIINs: 005094889, 006624618, 010154760, 012833952
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
special_featuresUSED ON KC135
NSN4730-00-509-4889
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 668066 · 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
•
FLOW RATE AND FLUID TYPE: 0.3 GALLONS PER MINUTE OIL
•
FSC APPLICATION DATA: HYDRAULIC SYSTEM AIRCRAFT
•
PRESSURE RATING: 3000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
STRAINER TYPE AND QUANTITY: 2 FILTER
•
END CONNECTION COMPONENT TYPE AND SIZE FOR WHICH DESIGNED: U/W 1/4 IN. OD TUBE IN
•
DESIGN TYPE: STRAIGHT
•
THREAD SERIES: UNF OR NF ALL CONNECTIONS
TECHNICAL CHARACTERISTICS
FLOW RATE AND FLUID TYPE0.3 GALLONS PER MINUTE OIL
FSC APPLICATION DATAHYDRAULIC SYSTEM AIRCRAFT
PRESSURE RATING3000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
STRAINER TYPE AND QUANTITY2 FILTER
END CONNECTION COMPONENT TYPE AND SIZE FOR WHICH DESIGNEDU/W 1/4 IN. OD TUBE IN
DESIGN TYPESTRAIGHT
THREAD SERIESUNF OR NF ALL CONNECTIONS
END CONNECTION TYPETHREADED MALE, GASKET SEAL LOCATION NOT OTHERWISE SPECIFIED
OVERALL LENGTH3.938 INCHES NOMINAL IN
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 668066?
668066 is a RESTRICTOR UNIT,FLUID FLOW.
What is the NSN for 668066?
668066 is cataloged in the U.S. Government catalog under NSN 4730-00-509-4889. 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.