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MS21916J4-2 ✓ 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 304 OVERALL, reducer_type: CONCENTRIC, thread_class: 3A ALL ENDS A, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS, surface_treatment: PASSIVATE OUTSIDE, nominal_thread_size: 0.312 INCHES SECOND END IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-052-7349, 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
MS21916J4-2
NSN: 4730-00-052-7349
FSC: 4730
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
reducer_typeCONCENTRIC
thread_class3A ALL ENDS A
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
surface_treatmentPASSIVATE OUTSIDE
nominal_thread_size0.312 INCHES SECOND END IN
nominal_overall_length1.094 INCHES IN
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
specification/standard_data81349-MIL-F-18280C GOVERNMENT SPECIFICATION
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-052-7349
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21916J4-2 · 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
•
MATERIAL: STEEL COMP 304 OVERALL
•
NOMINAL THREAD SIZE: 0.438 INCHES FIRST END IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
•
SPECIFICATION/STANDARD DATA: 81349-MIL-F-18280C GOVERNMENT SPECIFICATION
•
NOMINAL OVERALL LENGTH: 1.094 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OUTSIDE
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 304 OVERALL
NOMINAL THREAD SIZE0.438 INCHES FIRST END IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
SPECIFICATION/STANDARD DATA81349-MIL-F-18280C GOVERNMENT SPECIFICATION
NOMINAL OVERALL LENGTH1.094 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OUTSIDE
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
NOMINAL THREAD SIZE0.312 INCHES SECOND END IN
THREAD CLASS3A ALL ENDS A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
AS18280Interchangeable
Same NIIN cross-reference
interchangeable
AS21916Interchangeable
Same NIIN cross-reference
interchangeable
MS21916-4-2CInterchangeable
Same NIIN cross-reference
interchangeable
SAE-AS18280Interchangeable
Same NIIN cross-reference
interchangeable
10086117Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21916J4-2?
MS21916J4-2 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace MS21916J4-2?
There are 5 known substitutes for MS21916J4-2: AS18280, AS21916, MS21916-4-2C and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21916J4-2?
MS21916J4-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-052-7349. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026