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183655 — NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

183655: NUT,TUBE COUPLING.

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 303 PLUS X OVERALL, nut_style: TUBE COUPLING, nut_height: 0.625 INCHES NOMINAL IN, seat_angle: 45.00 DEGREES NOMINAL, thread_class: 3B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-204-0803, 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
183655
NSN: 4730-00-204-0803
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 303 PLUS X OVERALL
nut_styleTUBE COUPLING
nut_height0.625 INCHES NOMINAL IN
seat_angle45.00 DEGREES NOMINAL
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
width_across_flats0.683 INCHES NOMINAL IN
nominal_thread_size0.500 INCHES IN
smallest_inside_diameter0.344 INCHES NOMINAL IN
thread_quantity_per_inch20
nominal_tube_outside_diameter0.250 INCHES IN
NSN4730-00-204-0803
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 183655 · 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
•
WIDTH ACROSS FLATS: 0.683 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5640 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
SEAT ANGLE: 45.00 DEGREES NOMINAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
NUT HEIGHT: 0.625 INCHES NOMINAL IN
•
NUT STYLE: TUBE COUPLING
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.683 INCHES NOMINAL IN
THREAD SERIESUNF
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5640 ASSN STD ALL MATERIAL RESPONSES OVERALL
SEAT ANGLE45.00 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES IN
NUT HEIGHT0.625 INCHES NOMINAL IN
NUT STYLETUBE COUPLING
THREAD CLASS3B
THREAD QUANTITY PER INCH20
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 183655?
183655 is a NUT,TUBE COUPLING.
What is the NSN for 183655?
183655 is cataloged in the U.S. Government catalog under NSN 4730-00-204-0803. 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.