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C7556-4 — ADAPTER,STRAIGHT,TUBE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

C7556-4: ADAPTER,STRAIGHT,TUBE TO BOSS.

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY UNS R54520 OVERALL, thread_class: 3A FIRST END BULKHEAD A, connection_style: CUSHION SEAL (TUBE) ALL ENDS, style_designator: LONG W/ OFFSET WRENCHING FACILITY, operating_pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, nominal_thread_size: 0.438 INCHES FIRST END BULKHEAD IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-004-2800, 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
C7556-4
NSN: 4730-00-004-2800
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R54520 OVERALL
thread_class3A FIRST END BULKHEAD A
connection_styleCUSHION SEAL (TUBE) ALL ENDS
style_designatorLONG W/ OFFSET WRENCHING FACILITY
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.438 INCHES FIRST END BULKHEAD IN
maximum_operating_temp275.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length1.190 INCHES IN
thread_quantity_per_inch24 FIRST END BULKHEAD
thread_series_designatorUNJS ALL ENDS
material_document_and_classificationAMS 4965,6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V
nominal_outside_diameter_tube_accommodated0.250 INCHES ALL ENDS IN
NSN4730-00-004-2800
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: C7556-4 · 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
•
CONNECTION STYLE: CUSHION SEAL (TUBE) ALL ENDS
•
NOMINAL OVERALL LENGTH: 1.190 INCHES IN
•
STYLE DESIGNATOR: LONG W/ OFFSET WRENCHING FACILITY
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 4965,6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.438 INCHES FIRST END BULKHEAD IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLECUSHION SEAL (TUBE) ALL ENDS
NOMINAL OVERALL LENGTH1.190 INCHES IN
STYLE DESIGNATORLONG W/ OFFSET WRENCHING FACILITY
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 4965,6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.438 INCHES FIRST END BULKHEAD IN
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
MAXIMUM OPERATING TEMP275.0 FAHRENHEIT SINGLE RESPONSE DEGF
THREAD CLASS3A FIRST END BULKHEAD A
SUBSTITUTES & CROSS-REFERENCES 9
10111256Reference document
Same NSN cross-reference
Reference document — Informative reference only
AE16117-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
R44102T04Reference document
Same NSN cross-reference
Reference document — Secondary reference
4730PL1633412Reference document
Same NSN cross-reference
Reference document — Informative reference only
GC550FAReference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
ST7M215Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 C7556-4?
C7556-4 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace C7556-4?
There are 9 known substitutes for C7556-4: 10111256, AE16117-4, R44102T04 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for C7556-4?
C7556-4 is cataloged in the U.S. Government catalog under NSN 4730-00-004-2800. This indicates validated use in U.S. government and defense supply chains.
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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.