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0571351 — INVERTED NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

0571351: INVERTED NUT,TUBE COUPLING.

The INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL, seat_radius: 0.062 INCHES NOMINAL IN, thread_size: 3/8-24, thread_class: 2A A, overall_length: 0.562 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, FLARE. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-106-0637, 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
0571351
NSN: 4730-01-106-0637
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 13446 — PERKINS ENGINES INC (USA)
SPECIFICATIONS
materialSTEEL
seat_radius0.062 INCHES NOMINAL IN
thread_size3/8-24
thread_class2A A
overall_length0.562 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, FLARE
thread_directionRIGHT-HAND
fabrication_methodBAR STOCK, MACHINED
width_across_flats0.500 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.203 INCHES NOMINAL IN
screw_thread_series_designatorUNF
NSN4730-01-106-0637
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 0571351 · 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: 0.500 INCHES NOMINAL IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.219 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
•
THREAD DIRECTION: RIGHT-HAND
•
SEAT RADIUS: 0.062 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 3/8-24
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.219 INCHES NOMINAL IN
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
OVERALL LENGTH0.562 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
SEAT RADIUS0.062 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE3/8-24
SCREW THREAD SERIES DESIGNATORUNF
THREAD CLASS2A A
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: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 0571351?
0571351 is a INVERTED NUT,TUBE COUPLING.
What is the NSN for 0571351?
0571351 is cataloged in the U.S. Government catalog under NSN 4730-01-106-0637. 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.