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AS21902 ✓ 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 CORROSION RESISTING OVERALL, special_features: STAINLESS STEEL 5-15;CLASS 3 THREAD, nominal_outside_diameter: 0.375 INCHES FIRST END IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-009-8259, 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
AS21902
NSN: 4730-00-009-8259
FSC: 4730
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
special_featuresSTAINLESS STEEL 5-15;CLASS 3 THREAD
nominal_outside_diameter0.375 INCHES FIRST END IN
NSN4730-00-009-8259
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS21902 · 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
•
MAXIMUM OPERATING TEMP: 275.0 FAHRENHEIT FIRST RESPONSE DEGF
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
•
THREAD CLASS: 3A ALL ENDS A
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MEDIA FOR WHICH DESIGNED: HYDRAULIC FLUID FIRST RESPONSE
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
TECHNICAL CHARACTERISTICS (FLIS)
MAXIMUM OPERATING TEMP275.0 FAHRENHEIT FIRST RESPONSE DEGF
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
THREAD CLASS3A ALL ENDS A
SURFACE TREATMENTPASSIVATE OVERALL
MEDIA FOR WHICH DESIGNEDHYDRAULIC FLUID FIRST RESPONSE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072,E300,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE
NOMINAL OVERALL LENGTH1.062 INCHES IN
MATERIALSTEEL COMP 316 OR STEEL COMP 304 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
AS18280Interchangeable
Same NIIN cross-reference
interchangeable
4730PL0838813Interchangeable
Same NIIN cross-reference
interchangeable
MS21902K4Interchangeable
Same NIIN cross-reference
interchangeable
1376-18-515Interchangeable
Same NIIN cross-reference
interchangeable
SAE-AS18280Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS21902?
AS21902 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace AS21902?
There are 5 known substitutes for AS21902: AS18280, 4730PL0838813, MS21902K4 and 2 more. Substitute compatibility should be verified for your specific system.
Is AS21902 still available?
AS21902 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