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C9556-1 — CAP,LUBRICATION FITTING,PROTECTI

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

C9556-1: CAP,LUBRICATION FITTING,PROTECTI.

CAP,LUBRICATION FITTING,PROTECTI. Key specifications include material: STEEL COMP 303 CAP, connection_style: PLAIN, surface_treatment: PASSIVATE CAP, surface_treatment_document_and_classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE CAP. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-072-4792, 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
C9556-1
NSN: 4730-01-072-4792
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 303 CAP
connection_stylePLAIN
surface_treatmentPASSIVATE CAP
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE CAP
NSN4730-01-072-4792
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: C9556-1 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE CAP
•
CONNECTION STYLE: PLAIN
•
SURFACE TREATMENT: PASSIVATE CAP
•
MATERIAL: STEEL COMP 303 CAP
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE CAP
CONNECTION STYLEPLAIN
SURFACE TREATMENTPASSIVATE CAP
MATERIALSTEEL COMP 303 CAP
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is C9556-1?
C9556-1 is a CAP,LUBRICATION FITTING,PROTECTI.
What is the NSN for C9556-1?
C9556-1 is cataloged in the U.S. Government catalog under NSN 4730-01-072-4792. 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.