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MS21921-16 — INJECTOR ASSEMBLY,FUEL

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21921-16: INJECTOR ASSEMBLY,FUEL.

The INJECTOR ASSEMBLY,FUEL is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: TUBE COUPLING, nut_height: 1.040 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN, seat_angle: 45.00 DEGREES NOMINAL, thread_class: 3B, thread_series: UN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-554-8020, 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
MS21921-16
NSN: 4730-00-554-8020
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE COUPLING
nut_height1.040 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN
seat_angle45.00 DEGREES NOMINAL
thread_class3B
thread_seriesUN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
fabrication_methodMACHINED
length_to_shoulder0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN
width_across_flats1.500 INCHES NOMINAL IN
nominal_thread_size1.312 INCHES IN
NSN4730-00-554-8020
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21921-16 · 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
•
LENGTH TO SHOULDER: 0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 1.500 INCHES NOMINAL IN
•
THREAD SERIES: UN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-13433,TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SEAT ANGLE: 45.00 DEGREES NOMINAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.312 INCHES IN
•
SPECIFICATION/STANDARD DATA: 96906-MS21921 GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN
WIDTH ACROSS FLATS1.500 INCHES NOMINAL IN
THREAD SERIESUN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-13433,TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
SEAT ANGLE45.00 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.312 INCHES IN
SPECIFICATION/STANDARD DATA96906-MS21921 GOVERNMENT STANDARD
NUT HEIGHT1.040 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
SUBSTITUTES & CROSS-REFERENCES 4
AP2109T16Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
AS21921Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
202-21600W16Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS21921-16?
MS21921-16 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace MS21921-16?
There are 4 known substitutes for MS21921-16: AP2109T16, AS21921, AS18280 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21921-16?
MS21921-16 is cataloged in the U.S. Government catalog under NSN 4730-00-554-8020. This indicates validated use in U.S. government and defense supply chains.
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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.