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AS21911 — INJECTOR ASSEMBLY,FUEL

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

AS21911: INJECTOR ASSEMBLY,FUEL.

The INJECTOR ASSEMBLY,FUEL is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, leg_length: 0.438 INCHES NOMINAL THIRD END IN, seat_angle: 24.0 DEGREES FIRST END, thread_class: 3A SECOND END A, connection_type: THREADED EXTERNAL TUBE THIRD END, connection_style: GASKET SEAL (BOSS) FIRST END. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-277-9250, 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
AS21911
NSN: 4730-00-277-9250
NIINs: 002779250, 002779253, 002788398, 002894207, 005416488, 006405112, 007200172, 007296108, 008140815, 009936253, 010107017, 010413070, 010458461, 010458462, 011859465, 013633061, 013854817, 014422701, 015427021, 015427030, 015427192, 015589653
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
leg_length0.438 INCHES NOMINAL THIRD END IN
seat_angle24.0 DEGREES FIRST END
thread_class3A SECOND END A
connection_typeTHREADED EXTERNAL TUBE THIRD END
connection_styleGASKET SEAL (BOSS) FIRST END
special_featuresMATERIAL CORROSION RESISTANT STEEL (15-15PH) CADMIUM PLATED;BULKHEAD 1ST END, BOSS 2ND END
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.500 INCHES FIRST END IN
end_item_identificationUH-1 HELICOPTER
thread_quantity_per_inch12 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) THIRD END
NSN4730-00-277-9250
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS21911 · 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: MIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) THIRD END
•
CONNECTION TYPE: THREADED EXTERNAL BOSS THIRD END
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-367,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) THIRD END
CONNECTION STYLEFLARELESS (TUBE) FIRST END
CONNECTION STYLEGASKET SEAL (BOSS) SECOND END
CONNECTION TYPETHREADED EXTERNAL BOSS THIRD END
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
CONNECTION TYPETHREADED INTERNAL BOSS SECOND END
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-367,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.000 INCHES FIRST END IN
OPERATING PRESSURE1500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
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
MS21911W16Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS21911D16Reference document
Same NSN cross-reference
Reference document — Secondary reference
ER784D16Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 AS21911?
AS21911 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace AS21911?
There are 4 known substitutes for AS21911: MS21911W16, MS21911D16, ER784D16 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS21911?
AS21911 is cataloged in the U.S. Government catalog under NSN 4730-00-277-9250. 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.