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1551AS778-1 — COUPLING BODY,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1551AS778-1: COUPLING BODY,TUBE.

The COUPLING BODY,TUBE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303, overall_length: 0.969 INCHES NOMINAL IN, special_features: SPECIAL CLEANING FOR OXYGEN SERVICE IAW MIL-C-52211, style_designator: COUPLING BODY, tube_outside_diameter_for_which_designed: 0.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-301-0422, 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
1551AS778-1
NSN: 4730-01-301-0422
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 303
overall_length0.969 INCHES NOMINAL IN
special_featuresSPECIAL CLEANING FOR OXYGEN SERVICE IAW MIL-C-52211
style_designatorCOUPLING BODY
tube_outside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN4730-01-301-0422
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1551AS778-1 · 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
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: COUPLING BODY
•
MATERIAL: STEEL COMP 303
TECHNICAL CHARACTERISTICS
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
STYLE DESIGNATORCOUPLING BODY
OVERALL LENGTH0.969 INCHES NOMINAL IN
SPECIAL FEATURESSPECIAL CLEANING FOR OXYGEN SERVICE IAW MIL-C-52211
MATERIALSTEEL COMP 303
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 3
SS-401-PC-BLReference document
Same NSN cross-reference
Reference document — Secondary reference
1551AS778Reference document
Same NSN cross-reference
Reference document — Secondary reference
SS-401-PC-BLBQReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1551AS778-1?
1551AS778-1 is a COUPLING BODY,TUBE.
What parts can replace 1551AS778-1?
There are 3 known substitutes for 1551AS778-1: SS-401-PC-BL, 1551AS778, SS-401-PC-BLBQ. Substitute compatibility should be verified for your specific system.
What is the NSN for 1551AS778-1?
1551AS778-1 is cataloged in the U.S. Government catalog under NSN 4730-01-301-0422. 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.