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5308389 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL, seat_radius: 0.031 INCHES NOMINAL IN, thread_size: 3/8-27, overall_length: 0.375 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, FLARE, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-5537, 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
5308389
NSN: 4730-00-278-5537
FSC: 4730
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL
seat_radius0.031 INCHES NOMINAL IN
thread_size3/8-27
overall_length0.375 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, FLARE
thread_directionRIGHT-HAND
width_across_flats0.375 INCHES NOMINAL IN
thread_pitch_diameters+0.3487 TO 0.3509 INCHES IN
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.191 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN
screw_thread_series_designatorUNS
tube_outside_diameter_for_which_designed0.188 INCHES NOMINAL IN
NSN4730-00-278-5537
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 5308389 · 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
•
SCREW THREAD SERIES DESIGNATOR: UNS
•
MATERIAL: STEEL
•
WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL IN
•
THREAD SIZE: 3/8-27
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.188 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
SCREW THREAD SERIES DESIGNATORUNS
MATERIALSTEEL
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
THREAD SIZE3/8-27
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
OVERALL LENGTH0.375 INCHES NOMINAL IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.188 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
SMALLEST INSIDE DIAMETER0.191 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
SC5962-0379-1Interchangeable
interchangeable cross-reference
interchangeable
DM54LS08JInterchangeable
interchangeable cross-reference
interchangeable
54L-S08Interchangeable
interchangeable cross-reference
interchangeable
900931Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5308389?
5308389 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 5308389?
There are 4 known substitutes for 5308389: SC5962-0379-1, DM54LS08J, 54L-S08 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5308389?
5308389 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-5537. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026