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389901-3 — RESTRICTOR,FLUID FLOW

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

389901-3: RESTRICTOR,FLUID FLOW.

The RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include aircraft_location: TRAILING EDGE,WING TIP, end_item_identification: B-52 AIRCRAFT, aircraft_mission_design_series: B-52, part_name_assigned_by_controlling_agency: STIFFENER ASSEMBLY. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-907-1823, 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
389901-3
NSN: 4730-00-907-1823
NIINs: 009071823, 016280101
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
aircraft_locationTRAILING EDGE,WING TIP
end_item_identificationB-52 AIRCRAFT
aircraft_mission_design_seriesB-52
part_name_assigned_by_controlling_agencySTIFFENER ASSEMBLY
NSN4730-00-907-1823
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 389901-3 · 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
•
LENGTH: 0.163 INCHES NOMINAL IN
•
DESIGN TYPE: PLATE
•
OUTSIDE DIAMETER: 3.085 INCHES MINIMUM AND 3.241 INCHES MAXIMUM IN
•
SPECIFICATION/STANDARD DATA: 81348-QQ-C-576 GOVERNMENT SPECIFICATION
•
MATERIAL: COPPER
•
ORIFICE DIAMETER: 2.828 INCHES MINIMUM AND 2.833 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
LENGTH0.163 INCHES NOMINAL IN
DESIGN TYPEPLATE
OUTSIDE DIAMETER3.085 INCHES MINIMUM AND 3.241 INCHES MAXIMUM IN
SPECIFICATION/STANDARD DATA81348-QQ-C-576 GOVERNMENT SPECIFICATION
PART NAME ASSIGNED BY CONTROLLING AGENCYORIFICE-EJECTOR SUPPLY, LEADING EDGE
MATERIALCOPPER
ORIFICE DIAMETER2.828 INCHES MINIMUM AND 2.833 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
4730PL1140801Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 389901-3?
389901-3 is a RESTRICTOR,FLUID FLOW.
What parts can replace 389901-3?
There is 1 known substitute for 389901-3: 4730PL1140801. Substitute compatibility should be verified for your specific system.
What is the NSN for 389901-3?
389901-3 is cataloged in the U.S. Government catalog under NSN 4730-00-907-1823. 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.