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67646DX — INVERTED NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

67646DX: INVERTED NUT,TUBE COUPLING.

The INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, thread_size: 3/8-24, thread_class: 2A A, overall_length: 0.688 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, DOUBLE COMPRESSION, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-289-4758, 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
67646DX
NSN: 4730-00-289-4758
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 92679 — NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ (USA)
SPECIFICATIONS
materialCOPPER ALLOY
thread_size3/8-24
thread_class2A A
overall_length0.688 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, DOUBLE COMPRESSION
thread_directionRIGHT-HAND
fabrication_methodFORGED
width_across_flats0.375 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.190 INCHES NOMINAL IN
screw_thread_series_designatorUNF
tube_outside_diameter_for_which_designed0.188 INCHES NOMINAL IN
NSN4730-00-289-4758
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 67646DX · 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: 0.375 INCHES NOMINAL IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.188 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, DOUBLE COMPRESSION
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 3/8-24
•
SCREW THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.188 INCHES NOMINAL IN
STYLE DESIGNATORINVERTED NUT, TUBE, DOUBLE COMPRESSION
OVERALL LENGTH0.688 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE3/8-24
SCREW THREAD SERIES DESIGNATORUNF
THREAD CLASS2A A
MATERIALCOPPER ALLOY
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 2
81L3-16INReference document
Same NSN cross-reference
Reference document — Secondary reference
25038HAReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 67646DX?
67646DX is a INVERTED NUT,TUBE COUPLING.
What parts can replace 67646DX?
There are 2 known substitutes for 67646DX: 81L3-16IN, 25038HA. Substitute compatibility should be verified for your specific system.
What is the NSN for 67646DX?
67646DX is cataloged in the U.S. Government catalog under NSN 4730-00-289-4758. 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.