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388209 — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

388209: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: TUBE FITTING LOCKNUT, nut_height: 0.300 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-618-8484, 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
388209
NSN: 4730-00-618-8484
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 97139 — THE SLABE MACHINE PRODUCTS LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height0.300 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.803 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN
nominal_thread_size0.562 INCHES IN
packing_recess_depth0.037 INCHES MINIMUM AND 0.049 INCHES MAXIMUM IN
packing_recess_diameter0.728 INCHES MINIMUM AND 0.738 INCHES MAXIMUM IN
thread_quantity_per_inch18
NSN4730-00-618-8484
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 388209 · 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: 0.803 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN
•
PACKING RECESS DIAMETER: 0.728 INCHES MINIMUM AND 0.738 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.562 INCHES IN
•
NUT HEIGHT: 0.300 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
NUT STYLE: TUBE FITTING LOCKNUT
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.803 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN
PACKING RECESS DIAMETER0.728 INCHES MINIMUM AND 0.738 INCHES MAXIMUM IN
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.562 INCHES IN
NUT HEIGHT0.300 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
NUT STYLETUBE FITTING LOCKNUT
THREAD CLASS3B
THREAD QUANTITY PER INCH18
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 388209?
388209 is a LOCKNUT,TUBE FITTING.
What is the NSN for 388209?
388209 is cataloged in the U.S. Government catalog under NSN 4730-00-618-8484. 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.