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77556 — PRINTED WIRING BOARD

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

77556: PRINTED WIRING BOARD.

The PRINTED WIRING BOARD is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, flange_shape: RECTANGULAR WITH HOLES FIRST END, thread_class: 3B SECOND END, nominal_width: 1.024 INCHES FIRST END IN, overall_width: 2.750 INCHES NOMINAL IN, nominal_length: 1.024 INCHES FIRST END IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-044-5284, 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
77556
NSN: 4730-01-044-5284
NIINs: 010445284, 010970927, 013527086
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 82340 — L3HARRIS TECHNOLOGIES, INC. DIV SPACE AND AIRBORNE SYSTEMS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
flange_shapeRECTANGULAR WITH HOLES FIRST END
thread_class3B SECOND END
nominal_width1.024 INCHES FIRST END IN
overall_width2.750 INCHES NOMINAL IN
nominal_length1.024 INCHES FIRST END IN
overall_length2.750 INCHES NOMINAL IN
connection_typeFLANGE FIRST END
connection_styleGASKET SEAL (BOSS) SECOND END
special_featuresFLANGE HOLES THREADED 4-4OUNC-2B 0.25 FULL THD
bolt_hole_quantity4 FIRST END
flange_face_designPLAIN FIRST END
NSN4730-01-044-5284
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 77556 · 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
•
FLANGE SHAPE: RECTANGULAR WITH HOLES FIRST END
•
FLANGE FACE DESIGN: PLAIN FIRST END
•
CONNECTION STYLE: GASKET SEAL (BOSS) SECOND END
•
NOMINAL LENGTH: 1.024 INCHES FIRST END IN
•
CONNECTION TYPE: THREADED INTERNAL BOSS SECOND END
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BOLT HOLE NOMINAL DIAMETER: 0.112 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
FLANGE SHAPERECTANGULAR WITH HOLES FIRST END
FLANGE FACE DESIGNPLAIN FIRST END
CONNECTION STYLEGASKET SEAL (BOSS) SECOND END
NOMINAL LENGTH1.024 INCHES FIRST END IN
CONNECTION TYPETHREADED INTERNAL BOSS SECOND END
CONNECTION TYPEFLANGE FIRST END
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
BOLT HOLE NOMINAL DIAMETER0.112 INCHES FIRST END IN
NOMINAL THREAD SIZE0.875 INCHES SECOND END IN
CENTER TO CENTER NOMINAL DISTANCE BETWEEN BOLT HOLES ALONG WIDTH0.812 INCHES FIRST END IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 77556?
77556 is a PRINTED WIRING BOARD.
What is the NSN for 77556?
77556 is cataloged in the U.S. Government catalog under NSN 4730-01-044-5284. This indicates validated use in U.S. government and defense supply chains.
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