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2663881-4 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The RESTRICTOR UNIT,FLUID FLOW is a the manufacturer industrial component. Key specifications include diameter: 0.4375 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING FILTER, design_type: STRAIGHT, thread_class: 3A FIRST CONNECTION A, thread_series: UNF FIRST CONNECTION, overall_length: 0.270 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-220-4184, 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
2663881-4
NSN: 4730-01-220-4184
FSC: 4730
CAGE: 06848 — HONEYWELL INTERNATIONAL INC DIV AEROSPACE-SOUTH BEND (BENDIX DR) (USA)
SPECIFICATIONS
diameter0.4375 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING FILTER
design_typeSTRAIGHT
thread_class3A FIRST CONNECTION A
thread_seriesUNF FIRST CONNECTION
overall_length0.270 INCHES NOMINAL IN
special_featuresU/O F100-PW-220 ENG
thread_directionRIGHT-HAND FIRST CONNECTION
end_connection_typeTHREADED MALE, FLARELESS TUBE FIRST CONNECTION
thread_size_designator7/16-20 FIRST CONNECTION
end_connection_similarityNOT IDENTICAL
strainer_type_and_quantity1 FILTER
NSN4730-01-220-4184
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 2663881-4 · 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
•
END CONNECTION SIMILARITY: NOT IDENTICAL
•
END CONNECTION TYPE: THREADED MALE, FLARELESS TUBE FIRST CONNECTION
•
THREAD SERIES: UNF FIRST CONNECTION
•
MATERIAL: STEEL CORROSION RESISTING FILTER
•
STRAINER TYPE AND QUANTITY: 1 FILTER
•
THREAD DIRECTION: RIGHT-HAND FIRST CONNECTION
•
DIAMETER: 0.4375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
END CONNECTION SIMILARITYNOT IDENTICAL
END CONNECTION TYPETHREADED MALE, FLARELESS TUBE FIRST CONNECTION
THREAD SERIESUNF FIRST CONNECTION
MATERIALSTEEL CORROSION RESISTING FILTER
STRAINER TYPE AND QUANTITY1 FILTER
SPECIAL FEATURESU/O F100-PW-220 ENG
THREAD DIRECTIONRIGHT-HAND FIRST CONNECTION
DIAMETER0.4375 INCHES NOMINAL IN
THREAD CLASS3A FIRST CONNECTION A
OVERALL LENGTH0.270 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
1756443Interchangeable
interchangeable cross-reference
interchangeable
P726Interchangeable
interchangeable cross-reference
interchangeable
25325Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2663881-4?
2663881-4 is a RESTRICTOR UNIT,FLUID FLOW.
What parts can replace 2663881-4?
There are 3 known substitutes for 2663881-4: 1756443, P726, 25325. Substitute compatibility should be verified for your specific system.
What is the NSN for 2663881-4?
2663881-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-220-4184. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026