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Technical Data Sheet
PartsTable / COMPONENT / MS21921-10
MS21921-10 ✓ 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 XM-12 OVERALL, leg_length: 1.430 INCHES NOMINAL FIRST END IN, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, nominal_width: 1.375 INCHES ALL ENDS IN, nominal_length: 1.750 INCHES ALL ENDS IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-821-1824, 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
MS21921-10
NSN: 4730-00-821-1824
FSC: 4730
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL COMP XM-12 OVERALL
leg_length1.430 INCHES NOMINAL FIRST END IN
seat_angle12.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
nominal_width1.375 INCHES ALL ENDS IN
nominal_length1.750 INCHES ALL ENDS IN
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END
special_featuresSUPPLIED WITH O-RING
style_designatorFLARELESS W/ CENTER WRENCHING FACILITY
surface_treatmentCADMIUM OVERALL
operating_pressure1500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NSN4730-00-821-1824
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21921-10 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
MS21921-10DInterchangeable
interchangeable cross-reference
interchangeable
C61A2024D10Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS18280Interchangeable
interchangeable cross-reference
interchangeable
MS21921D10Interchangeable
Same NIIN cross-reference
interchangeable
4730008211824Interchangeable
Same NIIN cross-reference
interchangeable
9409525Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21921-10?
MS21921-10 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace MS21921-10?
There are 8 known substitutes for MS21921-10: MS21921-10D, C61A2024D10, SAE-AS18280 and 5 more. Substitute compatibility should be verified for your specific system.
Is MS21921-10 still available?
MS21921-10 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026