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2303803 — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

2303803: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: TUBE FITTING LOCKNUT, nut_height: 0.222 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-480-1851, 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
2303803
NSN: 4730-00-480-1851
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height0.222 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodMACHINED
width_across_flats0.750 INCHES NOMINAL IN
nominal_thread_size0.562 INCHES IN
packing_recess_depth0.125 INCHES NOMINAL IN
end_item_identificationA2N TORPEDO, MK 48
packing_recess_diameter0.625 INCHES NOMINAL IN
NSN4730-00-480-1851
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 2303803 · 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: 0.750 INCHES NOMINAL IN
•
PACKING RECESS DIAMETER: 0.625 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.562 INCHES IN
•
NUT HEIGHT: 0.222 INCHES NOMINAL IN
•
NUT STYLE: TUBE FITTING LOCKNUT
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
PACKING RECESS DIAMETER0.625 INCHES NOMINAL IN
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.562 INCHES IN
NUT HEIGHT0.222 INCHES NOMINAL IN
NUT STYLETUBE FITTING LOCKNUT
THREAD CLASS2B
END ITEM IDENTIFICATIONA2N TORPEDO, MK 48
THREAD QUANTITY PER INCH18
SUBSTITUTES & CROSS-REFERENCES 2
2303803-1Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
B122-4P4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2303803?
2303803 is a LOCKNUT,TUBE FITTING.
What parts can replace 2303803?
There are 2 known substitutes for 2303803: 2303803-1, B122-4P4. Substitute compatibility should be verified for your specific system.
What is the NSN for 2303803?
2303803 is cataloged in the U.S. Government catalog under NSN 4730-00-480-1851. 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.