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63551-56A — NUT ASSEMBLY,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

63551-56A: NUT ASSEMBLY,TUBE COUPLING.

The NUT ASSEMBLY,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY, thread_size: 4.250-12, thread_class: 2B, overall_length: 0.701 INCHES NOMINAL IN, outside_diameter: 4.427 INCHES NOMINAL IN, special_features: FURNISHED WITH TWO WASHERS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-028-7976, 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
63551-56A
NSN: 4730-01-028-7976
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 79326 — TRANSDIGM INC DIV ADELWIGGINS GROUP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
thread_size4.250-12
thread_class2B
overall_length0.701 INCHES NOMINAL IN
outside_diameter4.427 INCHES NOMINAL IN
special_featuresFURNISHED WITH TWO WASHERS
style_designatorNUT ASSEMBLY
thread_directionRIGHT-HAND
surface_treatmentANODIZE
working_temp_and_service_type65.0 DEG FAHRENHEIT MINIMUM JET FUEL AND 160.0 DEG FAHRENHEIT MAXIMUM JET FUEL
screw_thread_series_designatorUN
working_pressure_and_service_type125.0 POUNDS PER SQUARE INCH (PSI) NOMINAL JET FUEL LBS
NSN4730-01-028-7976
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 63551-56A · 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
•
WORKING TEMP AND SERVICE TYPE: 65.0 DEG FAHRENHEIT MINIMUM JET FUEL AND 160.0 DEG FAHRENHEIT MAXIMUM JET FUEL
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 3.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NUT ASSEMBLY
•
OUTSIDE DIAMETER: 4.427 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD SIZE: 4.250-12
TECHNICAL CHARACTERISTICS
WORKING TEMP AND SERVICE TYPE65.0 DEG FAHRENHEIT MINIMUM JET FUEL AND 160.0 DEG FAHRENHEIT MAXIMUM JET FUEL
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED3.500 INCHES NOMINAL IN
STYLE DESIGNATORNUT ASSEMBLY
OVERALL LENGTH0.701 INCHES NOMINAL IN
OUTSIDE DIAMETER4.427 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD SIZE4.250-12
SPECIAL FEATURESFURNISHED WITH TWO WASHERS
SCREW THREAD SERIES DESIGNATORUN
SURFACE TREATMENTANODIZE
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 4
AS1713D56Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
SAE-AS1710Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
GC550EHReference document
Same NSN cross-reference
Reference document — Drawing number reference only
GC550EH56ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 63551-56A?
63551-56A is a NUT ASSEMBLY,TUBE COUPLING.
What parts can replace 63551-56A?
There are 4 known substitutes for 63551-56A: AS1713D56, SAE-AS1710, GC550EH and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 63551-56A?
63551-56A is cataloged in the U.S. Government catalog under NSN 4730-01-028-7976. This indicates validated use in U.S. government and defense supply chains.
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