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4400B2059 — RESTRICTOR,FLUID FLOW

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4400B2059: RESTRICTOR,FLUID FLOW.

The RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include length: 0.536 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING, design_type: TUBULAR, thread_class: 3A LOCATION NOT OTHERWISE SPECIFIED A, thread_length: 0.375 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, thread_series: UNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-432-7591, 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
4400B2059
NSN: 4730-00-432-7591
NIINs: 004327591, 004377563
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 94117 — BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC. DBA BAE SYSTEMS (USA)
SPECIFICATIONS
length0.536 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING
design_typeTUBULAR
thread_class3A LOCATION NOT OTHERWISE SPECIFIED A
thread_length0.375 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
thread_seriesUNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
orifice_diameter0.041 INCHES NOMINAL IN
outside_diameter0.266 INCHES NOMINAL IN
thread_directionRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
thread_provisionTHREADED LOCATION NOT OTHERWISE SPECIFIED
surface_treatmentPASSIVATE
thread_size_designator8-32 LOCATION NOT OTHERWISE SPECIFIED
NSN4730-00-432-7591
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4400B2059 · 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: 0.536 INCHES NOMINAL IN
•
THREAD PROVISION: THREADED LOCATION NOT OTHERWISE SPECIFIED
•
DESIGN TYPE: TUBULAR
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
•
THREAD LENGTH: 0.375 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
OUTSIDE DIAMETER: 0.266 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
•
THREAD SIZE DESIGNATOR: 8-32 LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS
LENGTH0.536 INCHES NOMINAL IN
THREAD PROVISIONTHREADED LOCATION NOT OTHERWISE SPECIFIED
DESIGN TYPETUBULAR
THREAD SERIESUNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
THREAD LENGTH0.375 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
OUTSIDE DIAMETER0.266 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
THREAD SIZE DESIGNATOR8-32 LOCATION NOT OTHERWISE SPECIFIED
SURFACE TREATMENTPASSIVATE
THREAD CLASS3A LOCATION NOT OTHERWISE SPECIFIED A
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4400B2059?
4400B2059 is a RESTRICTOR,FLUID FLOW.
What is the NSN for 4400B2059?
4400B2059 is cataloged in the U.S. Government catalog under NSN 4730-00-432-7591. 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.