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MS21909K6 — INJECTOR ASSEMBLY,FUEL

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21909K6: INJECTOR ASSEMBLY,FUEL.

The INJECTOR ASSEMBLY,FUEL is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, leg_length: 1.062 INCHES MINIMUM AND 1.109 INCHES MAXIMUM SECOND END IN, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 3A THIRD END BULKHEAD A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARELESS (TUBE) ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-077-0304, 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
MS21909K6
NSN: 4730-01-077-0304
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
leg_length1.062 INCHES MINIMUM AND 1.109 INCHES MAXIMUM SECOND END IN
seat_angle12.0 DEGREES ALL ENDS
thread_class3A THIRD END BULKHEAD A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARELESS (TUBE) ALL ENDS
surface_treatmentPASSIVATE OUTSIDE
nominal_thread_size0.563 INCHES ALL ENDS IN
end_item_identificationLANDING CRAFT AIR CUSHION
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) THIRD END BULKHEAD
specification/standard_data96906-MS21909 GOVERNMENT STANDARD
nominal_outside_diameter_tube_accommodated0.375 INCHES ALL ENDS IN
NSN4730-01-077-0304
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21909K6 · 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
•
CONNECTION STYLE: FLARELESS (TUBE) ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.375 INCHES ALL ENDS IN
•
LEG LENGTH: 1.062 INCHES MINIMUM AND 1.109 INCHES MAXIMUM SECOND END IN
•
NOMINAL THREAD SIZE: 0.563 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARELESS (TUBE) ALL ENDS
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.375 INCHES ALL ENDS IN
LEG LENGTH1.062 INCHES MINIMUM AND 1.109 INCHES MAXIMUM SECOND END IN
LEG LENGTH1.062 INCHES MINIMUM AND 1.109 INCHES MAXIMUM FIRST END IN
LEG LENGTH1.688 INCHES MINIMUM AND 1.735 INCHES MAXIMUM THIRD END IN
NOMINAL THREAD SIZE0.563 INCHES ALL ENDS IN
NOMINAL THREAD SIZE0.563 INCHES THIRD END BULKHEAD IN
SEAT ANGLE12.0 DEGREES ALL ENDS
SPECIFICATION/STANDARD DATA96906-MS21909 GOVERNMENT STANDARD
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 5
SAE AS21909Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
AS21909Reference document
Same NSN cross-reference
Reference document — Secondary reference
5749803 PC148Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS18280Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS21909K6?
MS21909K6 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace MS21909K6?
There are 5 known substitutes for MS21909K6: SAE AS21909, AS21909, 5749803 PC148 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21909K6?
MS21909K6 is cataloged in the U.S. Government catalog under NSN 4730-01-077-0304. 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.