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AS21909 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The INJECTOR ASSEMBLY,FUEL is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, leg_length: 0.937 INCHES NOMINAL FIRST END IN, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARELESS (TUBE) ALL ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-134-8256, 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
AS21909
NSN: 4730-00-134-8256
FSC: 4730
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
leg_length0.937 INCHES NOMINAL FIRST END IN
seat_angle12.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARELESS (TUBE) ALL ENDS
special_featuresMATERIAL CORROSION RESISTANT STEEL (15-5PH) CADMIUM PLATED; BRANCH HAS BULKHEAD FEATURE
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.438 INCHES ALL ENDS IN
thread_quantity_per_inch12 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
specification/standard_data81343-AS21909 GOVERNMENT STANDARD
NSN4730-00-134-8256
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS21909 · 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
•
SEAT ANGLE: 12.0 DEGREES ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-367,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: ALUMINUM ALLOY 7075 OVERALL
•
THREAD CLASS: 3A THIRD END BULKHEAD A
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.500 INCHES THIRD END BULKHEAD IN
•
SURFACE TREATMENT: ANODIZE OVERALL
•
SPECIFICATION/STANDARD DATA: 96906-MS21909 GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
SEAT ANGLE12.0 DEGREES ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-367,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALALUMINUM ALLOY 7075 OVERALL
THREAD CLASS3A THIRD END BULKHEAD A
END ITEM IDENTIFICATIONS-3A VIKING AIRCRAFT A
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.500 INCHES THIRD END BULKHEAD IN
SURFACE TREATMENTANODIZE OVERALL
SPECIFICATION/STANDARD DATA96906-MS21909 GOVERNMENT STANDARD
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NOMINAL THREAD SIZE0.750 INCHES THIRD END BULKHEAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
MS21909W8Interchangeable
Same NIIN cross-reference
interchangeable
SAE-AS18280Interchangeable
Same NIIN cross-reference
interchangeable
AS18280Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS21909?
AS21909 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace AS21909?
There are 3 known substitutes for AS21909: MS21909W8, SAE-AS18280, AS18280. Substitute compatibility should be verified for your specific system.
What is the NSN for AS21909?
AS21909 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-134-8256. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026