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MS21940-4L — INJECTOR ASSEMBLY,FUEL

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21940-4L: INJECTOR ASSEMBLY,FUEL.

The INJECTOR ASSEMBLY,FUEL is a the manufacturer industrial component. Key specifications include material: ALUMINUM, body_style: BODY WRENCHING, overall_length: 3.328 INCHES NOMINAL IN, surface_treatment: ANODIZE, width_across_flats: 0.684 INCHES MINIMUM AND 0.691 INCHES MAXIMUM IN, concentric_hole_depth: 2.653 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-203-9752, 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
MS21940-4L
NSN: 4730-00-203-9752
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialALUMINUM
body_styleBODY WRENCHING
overall_length3.328 INCHES NOMINAL IN
surface_treatmentANODIZE
width_across_flats0.684 INCHES MINIMUM AND 0.691 INCHES MAXIMUM IN
concentric_hole_depth2.653 INCHES NOMINAL IN
second_end_seat_angle12.0 DEGREES NOMINAL
first_end_thread_class3A A
first_end_thread_length0.325 INCHES NOMINAL IN
second_end_thread_class3A A
wrenching_feature_styleHEXAGON
concentric_hole_diameter0.187 INCHES NOMINAL IN
NSN4730-00-203-9752
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21940-4L · 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
•
FIRST END THREAD SERIES DESIGNATOR: UNF
•
WIDTH ACROSS FLATS: 0.684 INCHES MINIMUM AND 0.691 INCHES MAXIMUM IN
•
FIRST END THREAD DIRECTION: RIGHT-HAND
•
SECOND END NOMINAL THREAD SIZE: 0.437 INCHES IN
•
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER: 0.354 INCHES NOMINAL IN
•
SECOND END THREAD CLASS: 3A A
•
THIRD DIAMETER FROM WRENCHING FEATURE: 0.499 INCHES NOMINAL IN
•
BODY STYLE: BODY WRENCHING
TECHNICAL CHARACTERISTICS
FIRST END THREAD SERIES DESIGNATORUNF
WIDTH ACROSS FLATS0.684 INCHES MINIMUM AND 0.691 INCHES MAXIMUM IN
FIRST END THREAD DIRECTIONRIGHT-HAND
SECOND END NOMINAL THREAD SIZE0.437 INCHES IN
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER0.354 INCHES NOMINAL IN
SECOND END THREAD CLASS3A A
THIRD DIAMETER FROM WRENCHING FEATURE0.499 INCHES NOMINAL IN
BODY STYLEBODY WRENCHING
FIRST END THREAD CLASS3A A
FIRST END STYLE DESIGNATORPLAIN
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
AS18280Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS21940Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
MS21940W4LReference document
Same NSN cross-reference
Reference document — Secondary reference
ER01244Reference document
Same NSN cross-reference
Reference document — Secondary 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 MS21940-4L?
MS21940-4L is a INJECTOR ASSEMBLY,FUEL.
What parts can replace MS21940-4L?
There are 5 known substitutes for MS21940-4L: AS18280, AS21940, SAE-AS18280 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21940-4L?
MS21940-4L is cataloged in the U.S. Government catalog under NSN 4730-00-203-9752. This indicates validated use in U.S. government and defense supply chains.
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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.