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D-4-BR — RESTRICTOR,FLUID FLOW

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

D-4-BR: RESTRICTOR,FLUID FLOW.

The RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include length: 0.880 INCHES NOMINAL IN, material: COPPER ALLOY, design_type: TUBULAR, HEX SHAPE, thread_class: 2A FIRST PROVISION A, thread_length: 0.125 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, thread_series: NPTF LOCATION NOT OTHERWISE SPECIFIED. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-479-0128, 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
D-4-BR
NSN: 4730-01-479-0128
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 59023 — O'KEEFE CONTROLS CO. (USA)
SPECIFICATIONS
length0.880 INCHES NOMINAL IN
materialCOPPER ALLOY
design_typeTUBULAR, HEX SHAPE
thread_class2A FIRST PROVISION A
thread_length0.125 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
thread_seriesNPTF LOCATION NOT OTHERWISE SPECIFIED
orifice_diameter0.003 INCHES NOMINAL IN
outside_diameter0.562 INCHES NOMINAL IN
thread_directionRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
thread_provisionTHREADED LOCATION NOT OTHERWISE SPECIFIED
thread_size_designator1/8-20 LOCATION NOT OTHERWISE SPECIFIED
NSN4730-01-479-0128
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: D-4-BR · 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: 0.880 INCHES NOMINAL IN
•
THREAD PROVISION: THREADED LOCATION NOT OTHERWISE SPECIFIED
•
DESIGN TYPE: TUBULAR, HEX SHAPE
•
THREAD SERIES: NPTF LOCATION NOT OTHERWISE SPECIFIED
•
THREAD LENGTH: 0.125 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
OUTSIDE DIAMETER: 0.562 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
•
THREAD SIZE DESIGNATOR: 1/8-20 LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS
LENGTH0.880 INCHES NOMINAL IN
THREAD PROVISIONTHREADED LOCATION NOT OTHERWISE SPECIFIED
DESIGN TYPETUBULAR, HEX SHAPE
THREAD SERIESNPTF LOCATION NOT OTHERWISE SPECIFIED
THREAD LENGTH0.125 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
OUTSIDE DIAMETER0.562 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
THREAD SIZE DESIGNATOR1/8-20 LOCATION NOT OTHERWISE SPECIFIED
THREAD CLASS2A FIRST PROVISION A
THREAD CLASS2B SECOND PROVISION
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 1
581996-001Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is D-4-BR?
D-4-BR is a RESTRICTOR,FLUID FLOW.
What parts can replace D-4-BR?
There is 1 known substitute for D-4-BR: 581996-001. Substitute compatibility should be verified for your specific system.
What is the NSN for D-4-BR?
D-4-BR is cataloged in the U.S. Government catalog under NSN 4730-01-479-0128. 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.