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AS5178J16 — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

AS5178J16: 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: 0.406 INCHES NOMINAL IN, thread_series: UNIFIED NATIONAL JOINT (UNJ), thread_direction: RIGHT-HAND, width_across_flats: 1.630 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-516-2509, 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
AS5178J16
NSN: 4730-01-516-2509
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height0.406 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL JOINT (UNJ)
thread_directionRIGHT-HAND
width_across_flats1.630 INCHES NOMINAL IN
nominal_thread_size1.312 INCHES IN
end_item_identification2350-01-080-9088
thread_quantity_per_inch12
nominal_tube_outside_diameter1.000 INCHES IN
part_name_assigned_by_controlling_agencyNUT, BULKHEAD
NSN4730-01-516-2509
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS5178J16 · 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: 1.630 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT (UNJ)
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.312 INCHES IN
•
NUT HEIGHT: 0.406 INCHES NOMINAL IN
•
NUT STYLE: TUBE FITTING LOCKNUT
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.630 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL JOINT (UNJ)
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.312 INCHES IN
NUT HEIGHT0.406 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNUT, BULKHEAD
NUT STYLETUBE FITTING LOCKNUT
END ITEM IDENTIFICATION2350-01-080-9088
THREAD QUANTITY PER INCH12
MATERIALSTEEL CORROSION RESISTING 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 1
AS4841Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AS5178J16?
AS5178J16 is a LOCKNUT,TUBE FITTING.
What parts can replace AS5178J16?
There is 1 known substitute for AS5178J16: AS4841. Substitute compatibility should be verified for your specific system.
What is the NSN for AS5178J16?
AS5178J16 is cataloged in the U.S. Government catalog under NSN 4730-01-516-2509. 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.