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SECO 7N18 — SEAL,CONICAL,FLARED TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

SECO 7N18: SEAL,CONICAL,FLARED TUBE FITTING.

SEAL,CONICAL,FLARED TUBE FITTING. Key specifications include material: NICKEL ALLOY 201, body_length: 0.060 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN, wall_thickness: 0.009 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN, outside_diameter: 1.375 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN, style_designator: SEAL, seat_angle_in_deg: 37.0. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-070-6866, 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
SECO 7N18
NSN: 4730-01-070-6866
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 33447 — SECO SEALS, INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY 201
body_length0.060 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
wall_thickness0.009 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN
outside_diameter1.375 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
style_designatorSEAL
seat_angle_in_deg37.0
casehardening_indicatorNOT CASEHARDENED
material_document_and_classificationAMS 5553 ASSN STD SINGLE MATERIAL RESPONSE
hose/tube_outside_diameter_for_which_designed1.125 INCHES NOMINAL IN
NSN4730-01-070-6866
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: SECO 7N18 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5553 ASSN STD SINGLE MATERIAL RESPONSE
•
WALL THICKNESS: 0.009 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.375 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
•
BODY LENGTH: 0.060 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MATERIAL: NICKEL ALLOY 201
TECHNICAL CHARACTERISTICS
SEAT ANGLE IN DEG37.0
STYLE DESIGNATORSEAL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5553 ASSN STD SINGLE MATERIAL RESPONSE
WALL THICKNESS0.009 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.375 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
BODY LENGTH0.060 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
MATERIALNICKEL ALLOY 201
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED1.125 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 3
SECO 7NReference document
Same NSN cross-reference
Reference document — Secondary reference
DY90Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
7N18Reference 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 SECO 7N18?
SECO 7N18 is a SEAL,CONICAL,FLARED TUBE FITTING.
What parts can replace SECO 7N18?
There are 3 known substitutes for SECO 7N18: SECO 7N, DY90, 7N18. Substitute compatibility should be verified for your specific system.
What is the NSN for SECO 7N18?
SECO 7N18 is cataloged in the U.S. Government catalog under NSN 4730-01-070-6866. 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.