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55139AX — SLEEVE,COMPRESSION,TUBE-HOSE FIT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

55139AX: SLEEVE,COMPRESSION,TUBE-HOSE FIT.

SLEEVE,COMPRESSION,TUBE-HOSE FIT. Key specifications include material: COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, flow_angle: 90.0 DEGREES, leg_length: 20.3 MILLIMETERS NOMINAL FIRST END MM, nut_height: 0.730 INCHES NOMINAL IN, seat_angle: 20.0 DEGREES FIRST END. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-134-6989, 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
55139AX
NSN: 4730-01-134-6989
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
flow_angle90.0 DEGREES
leg_length20.3 MILLIMETERS NOMINAL FIRST END MM
nut_height0.730 INCHES NOMINAL IN
seat_angle20.0 DEGREES FIRST END
reducer_typeCONCENTRIC
thread_class2A FIRST END A
overall_width0.375 INCHES NOMINAL IN
thread_seriesUNS
overall_length1.220 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL TUBE FIRST END
NSN4730-01-134-6989
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 55139AX · 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
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 6
J246Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-J246Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
270NTA-6-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
1470X6Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE J246 6-4 100203BAReference document
Same NSN cross-reference
Reference document — Secondary reference
270NTA-6-AReference 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 55139AX?
55139AX is a SLEEVE,COMPRESSION,TUBE-HOSE FIT.
What parts can replace 55139AX?
There are 6 known substitutes for 55139AX: J246, SAE-J246, 270NTA-6-4 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 55139AX?
55139AX is cataloged in the U.S. Government catalog under NSN 4730-01-134-6989. 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.