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Technical Data Sheet
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8431398-2 — SEAL,CONICAL,FLARED TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

8431398-2: SEAL,CONICAL,FLARED TUBE FITTING.

SEAL,CONICAL,FLARED TUBE FITTING. Key specifications include body_length: 0.085 INCHES NOMINAL IN, overall_length: 0.158 INCHES MINIMUM AND 0.207 INCHES MAXIMUM IN, wall_thickness: 0.021 INCHES NOMINAL IN, outside_diameter: 0.502 INCHES NOMINAL IN, style_designator: SEAL, seat_angle_in_deg: 37.0. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-369-0025, 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
8431398-2
NSN: 4730-01-369-0025
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 98752 — WARNER ROBINS AIR LOGISTICS CENTER (USA)
SPECIFICATIONS
body_length0.085 INCHES NOMINAL IN
overall_length0.158 INCHES MINIMUM AND 0.207 INCHES MAXIMUM IN
wall_thickness0.021 INCHES NOMINAL IN
outside_diameter0.502 INCHES NOMINAL IN
style_designatorSEAL
seat_angle_in_deg37.0
casehardening_indicatorNOT CASEHARDENED
hose/tube_outside_diameter_for_which_designed0.375 INCHES NOMINAL IN
NSN4730-01-369-0025
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 8431398-2 · 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
•
SEAT ANGLE IN DEG: 37.0
•
STYLE DESIGNATOR: SEAL
•
WALL THICKNESS: 0.021 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.502 INCHES NOMINAL IN
•
BODY LENGTH: 0.085 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MATERIAL: COPPER ALLOY 110 OR COPPER ALLOY 122 OR COPPER ALLOY 125 OR COPPER ALLOY 142 OR COPPER ALLOY 102 OR COPPER ALLOY 104 OR COPPER ALLOY 105 OR COPPER ALLOY 107 OR COPPER ALLOY 114 OR COPPER ALLOY 116 OR COPPER ALLOY 120 OR COPPER ALLOY 121 OR COPPER ALLOY 123 OR COPPER ALLOY 130 OR COPPER ALLOY 128 OR COPPER ALLOY 127
TECHNICAL CHARACTERISTICS
SEAT ANGLE IN DEG37.0
STYLE DESIGNATORSEAL
OVERALL LENGTH0.158 INCHES MINIMUM AND 0.207 INCHES MAXIMUM IN
WALL THICKNESS0.021 INCHES NOMINAL IN
OUTSIDE DIAMETER0.502 INCHES NOMINAL IN
BODY LENGTH0.085 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
MATERIALCOPPER ALLOY 110 OR COPPER ALLOY 122 OR COPPER ALLOY 125 OR COPPER ALLOY 142 OR COPPER ALLOY 102 OR COPPER ALLOY 104 OR COPPER ALLOY 105 OR COPPER ALLOY 107 OR COPPER ALLOY 114 OR COPPER ALLOY 116 OR COPPER ALLOY 120 OR COPPER ALLOY 121 OR COPPER ALLOY 123 OR COPPER ALLOY 130 OR COPPER ALLOY 128 OR COPPER ALLOY 127
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.375 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
8431398Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
AP50C-6Reference 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 8431398-2?
8431398-2 is a SEAL,CONICAL,FLARED TUBE FITTING.
What parts can replace 8431398-2?
There are 2 known substitutes for 8431398-2: 8431398, AP50C-6. Substitute compatibility should be verified for your specific system.
What is the NSN for 8431398-2?
8431398-2 is cataloged in the U.S. Government catalog under NSN 4730-01-369-0025. 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.