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N20520A — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

N20520A: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, nut_height: 0.406 INCHES NOMINAL IN, thread_class: 3B, thread_series: UN, special_features: DYED BLUE, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-213-4182, 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
N20520A
NSN: 4730-01-213-4182
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 00624 — EATON AEROQUIP LLC DBA JACKSON NORTH 1 DIV FLUID AND ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
nut_height0.406 INCHES NOMINAL IN
thread_class3B
thread_seriesUN
special_featuresDYED BLUE
thread_directionRIGHT-HAND
surface_treatmentANODIZE OVERALL
nominal_thread_size2.750 INCHES IN
hole_type_and_quantity8 DRILLED
end_item_identificationUSED ON AIRFRAME
thread_quantity_per_inch16
nominal_tube_outside_diameter2.000 INCHES IN
NSN4730-01-213-4182
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: N20520A · 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
•
THREAD SERIES: UN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 2.750 INCHES IN
•
NUT HEIGHT: 0.406 INCHES NOMINAL IN
•
SURFACE TREATMENT: ANODIZE OVERALL
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS
THREAD SERIESUN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE2.750 INCHES IN
NUT HEIGHT0.406 INCHES NOMINAL IN
SPECIAL FEATURESDYED BLUE
SURFACE TREATMENTANODIZE OVERALL
THREAD CLASS3B
END ITEM IDENTIFICATIONUSED ON AIRFRAME
THREAD QUANTITY PER INCH16
MATERIALALUMINUM ALLOY 2024 OVERALL
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is N20520A?
N20520A is a LOCKNUT,TUBE FITTING.
What is the NSN for N20520A?
N20520A is cataloged in the U.S. Government catalog under NSN 4730-01-213-4182. 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.