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MS21914-4K — INJECTOR ASSEMBLY,FUEL

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21914-4K: INJECTOR ASSEMBLY,FUEL.

The INJECTOR ASSEMBLY,FUEL is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, thread_class: 3B INTERNAL, connection_style: PRESSURE SEAL FLARELESS, style_designator: CAP, TUBE, FLARELESS, thread_direction: RIGHT-HAND INTERNAL, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-169-4233, 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
MS21914-4K
NSN: 4730-00-169-4233
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
thread_class3B INTERNAL
connection_stylePRESSURE SEAL FLARELESS
style_designatorCAP, TUBE, FLARELESS
thread_directionRIGHT-HAND INTERNAL
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.438 INCHES INTERNAL IN
seat_nominal_radius0.0225 INCHES IN
end_item_identificationAIRCRAFT APPLICATION
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) INTERNAL
specification/standard_data81343-MS21914-4K GOVERNMENT STANDARD
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-169-4233
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21914-4K · 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: PRESSURE SEAL FLARELESS
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
SEAT NOMINAL RADIUS: 0.0225 INCHES IN
•
STYLE DESIGNATOR: CAP, TUBE, FLARELESS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND INTERNAL
•
NOMINAL THREAD SIZE: 0.438 INCHES INTERNAL IN
•
SPECIFICATION/STANDARD DATA: 81343-MS21914-4K GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS
CONNECTION STYLEPRESSURE SEAL FLARELESS
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
SEAT NOMINAL RADIUS0.0225 INCHES IN
STYLE DESIGNATORCAP, TUBE, FLARELESS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND INTERNAL
NOMINAL THREAD SIZE0.438 INCHES INTERNAL IN
SPECIFICATION/STANDARD DATA81343-MS21914-4K GOVERNMENT STANDARD
SURFACE TREATMENTPASSIVATE OVERALL
THREAD CLASS3B INTERNAL
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
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
4730PL1523249Reference document
Same NSN cross-reference
Reference document — Informative reference only
AS21914Reference 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 MS21914-4K?
MS21914-4K is a INJECTOR ASSEMBLY,FUEL.
What parts can replace MS21914-4K?
There are 4 known substitutes for MS21914-4K: SAE-AS18280, 4730PL1523249, AS21914 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21914-4K?
MS21914-4K is cataloged in the U.S. Government catalog under NSN 4730-00-169-4233. 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.