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261P1-4 — NUT,COUPLING,FLEXIBLE CASING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

261P1-4: NUT,COUPLING,FLEXIBLE CASING.

The NUT,COUPLING,FLEXIBLE CASING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 360 NUT, nut_style: TUBE COUPLING, nut_height: 0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNF, special_features: GRUMMAN AIRCRAFT MODEL A10. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-817-1891, 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
261P1-4
NSN: 4730-00-817-1891
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 30327 — IMPERIAL (USA)
SPECIFICATIONS
materialCOPPER ALLOY 360 NUT
nut_styleTUBE COUPLING
nut_height0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
special_featuresGRUMMAN AIRCRAFT MODEL A10
thread_directionRIGHT-HAND
fabrication_methodCAST
length_to_shoulder0.359 INCHES NOMINAL IN
width_across_flats0.437 INCHES NOMINAL IN
nominal_thread_size0.437 INCHES IN
smallest_inside_diameter0.266 INCHES NOMINAL IN
NSN4730-00-817-1891
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 261P1-4 · 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
•
LENGTH TO SHOULDER: 0.359 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.437 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.437 INCHES IN
•
NUT HEIGHT: 0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
NUT STYLE: TUBE COUPLING
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.359 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.437 INCHES NOMINAL IN
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.437 INCHES IN
NUT HEIGHT0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
SPECIAL FEATURESGRUMMAN AIRCRAFT MODEL A10
NUT STYLETUBE COUPLING
THREAD CLASS3B
THREAD QUANTITY PER INCH20
SUBSTITUTES & CROSS-REFERENCES 1
261-PX1/4Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 261P1-4?
261P1-4 is a NUT,COUPLING,FLEXIBLE CASING.
What parts can replace 261P1-4?
There is 1 known substitute for 261P1-4: 261-PX1/4. Substitute compatibility should be verified for your specific system.
What is the NSN for 261P1-4?
261P1-4 is cataloged in the U.S. Government catalog under NSN 4730-00-817-1891. 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.