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278121 — FITTING,HOLD BACK,AIRCRAFT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

278121: FITTING,HOLD BACK,AIRCRAFT.

The FITTING,HOLD BACK,AIRCRAFT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, flow_angle: 90.0 DEGREES, leg_length: 1.120 INCHES NOMINAL SECOND END IN, seat_angle: 37.0 DEGREES SECOND END, thread_class: 3A SECOND END A, connection_type: THREADED EXTERNAL TUBE SECOND END. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-540-1522, 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
278121
NSN: 4730-00-540-1522
NIINs: 005401522, 015121880
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
flow_angle90.0 DEGREES
leg_length1.120 INCHES NOMINAL SECOND END IN
seat_angle37.0 DEGREES SECOND END
thread_class3A SECOND END A
connection_typeTHREADED EXTERNAL TUBE SECOND END
connection_styleFLARED (TUBE) FIRST END
special_features1ST END BULKHEAD THREAD SIZE 0.750 IN. NOM,CLASS 3A,UNF A
nominal_thread_size0.438 INCHES SECOND END IN
thread_series_designatorUNF FIRST END
material_document_and_classificationAMS5640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
reduced_passage_nominal_inside_diameter0.332 INCHES FIRST END IN
NSN4730-00-540-1522
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 278121 · 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
•
FLOW ANGLE: 90.0 DEGREES
•
CONNECTION STYLE: FLARED (TUBE) SECOND END
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST END
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES SECOND END IN
TECHNICAL CHARACTERISTICS
FLOW ANGLE90.0 DEGREES
CONNECTION STYLEFLARED (TUBE) SECOND END
CONNECTION STYLEFLARED (TUBE) FIRST END
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
CONNECTION TYPETHREADED EXTERNAL TUBE SECOND END
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES SECOND END IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.500 INCHES FIRST END IN
LEG LENGTH1.180 INCHES NOMINAL FIRST END IN
LEG LENGTH1.120 INCHES NOMINAL SECOND 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 278121?
278121 is a FITTING,HOLD BACK,AIRCRAFT.
What is the NSN for 278121?
278121 is cataloged in the U.S. Government catalog under NSN 4730-00-540-1522. This indicates validated use in U.S. government and defense supply chains.
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