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5266443 — INVERTED NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

5266443: INVERTED NUT,TUBE COUPLING.

The INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: PLASTIC EPOXY AND GLASS FIBER OVERALL, corner_shape: SQUARE INSIDE RIGHT CORNER, overall_length: 0.5000 INCHES NOMINAL IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 0.3280 INCHES NOMINAL IN, body_outside_diameter: 0.7500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-013-7399, 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
5266443
NSN: 4730-00-013-7399
NIINs: 000137399, 014062164
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 65282 — WHITE MOTOR CORP (USA)
SPECIFICATIONS
materialPLASTIC EPOXY AND GLASS FIBER OVERALL
corner_shapeSQUARE INSIDE RIGHT CORNER
overall_length0.5000 INCHES NOMINAL IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter0.3280 INCHES NOMINAL IN
body_outside_diameter0.7500 INCHES NOMINAL IN
material_document_and_classificationMIL-P-18177 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-013-7399
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 5266443 · 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: 0.625 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 45.00
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 5/8-18
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
SEAT ANGLE IN DEG45.00
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.375 INCHES NOMINAL IN
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
OVERALL LENGTH0.660 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE5/8-18
SCREW THREAD SERIES DESIGNATORUNF
SURFACE TREATMENTCADMIUM OR ZINC OR ZINC AND DICHROMATE
SUBSTITUTES & CROSS-REFERENCES 4
13713Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
137399Reference document
Same NSN cross-reference
Reference document — Secondary reference
105Z6Reference document
Same NSN cross-reference
Reference document — Secondary reference
705FB5Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5266443?
5266443 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 5266443?
There are 4 known substitutes for 5266443: 13713, 137399, 105Z6 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5266443?
5266443 is cataloged in the U.S. Government catalog under NSN 4730-00-013-7399. 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.