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6640811 — RESTRICTOR,FLUID FLOW

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

6640811: RESTRICTOR,FLUID FLOW.

The RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include material: COPPER AND NICKEL ALLOY, surface_finish: 63.0 MICROINCHES LARGEST OUTSIDE DIAMETER, inside_diameter: 2.250 INCHES NOMINAL IN, outside_diameter: 2.495 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN, overall_thickness: 0.187 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN, material_document_and_classification: MIL-T-16420 2.50 INCH CL3300 MIL SPEC SINGLE MATERIAL RESPONSE IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-367-2209, 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
6640811
NSN: 4730-01-367-2209
NIINs: 013672209, 013674815, 013674816, 013675452, 013675453, 013675560, 013675561, 013677617, 013687730, 014790219, 014790222, 014794628, 014847847, 014847850, 014854566, 014854599, 014855363, 014870296, 014870797, 014875444, 014875445, 014876333, 014876364, 014876756, 014876856, 014876864, 014877195, 014877418, 014905605, 014906152, 014906154, 014942712, 014945768, 014945777, 014945973, 014978033, 015220932, 015253129, 015253135, 015260093, 015354697, 015356442, 017110999
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER AND NICKEL ALLOY
surface_finish63.0 MICROINCHES LARGEST OUTSIDE DIAMETER
inside_diameter2.250 INCHES NOMINAL IN
outside_diameter2.495 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN
overall_thickness0.187 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN
material_document_and_classificationMIL-T-16420 2.50 INCH CL3300 MIL SPEC SINGLE MATERIAL RESPONSE IN
part_name_assigned_by_controlling_agencyOUTER SPACER RING
NSN4730-01-367-2209
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 6640811 · 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: 0.125 INCHES NOMINAL IN
•
THREAD PROVISION: UNTHREADED LOCATION NOT OTHERWISE SPECIFIED
•
DESIGN TYPE: PLATE
•
OUTSIDE DIAMETER: 4.480 INCHES MINIMUM AND 4.510 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 316
•
ORIFICE DIAMETER: 0.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
LENGTH0.125 INCHES NOMINAL IN
THREAD PROVISIONUNTHREADED LOCATION NOT OTHERWISE SPECIFIED
DESIGN TYPEPLATE
OUTSIDE DIAMETER4.480 INCHES MINIMUM AND 4.510 INCHES MAXIMUM IN
SPECIAL FEATURES258 ORIFICES
MATERIALSTEEL COMP 316
ORIFICE DIAMETER0.125 INCHES NOMINAL 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 6640811?
6640811 is a RESTRICTOR,FLUID FLOW.
What is the NSN for 6640811?
6640811 is cataloged in the U.S. Government catalog under NSN 4730-01-367-2209. 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.