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AS21916 — Technical Data Sheet

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— · 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: ALUMINUM ALLOY 2024 OVERALL, reducer_type: CONCENTRIC, thread_class: 3A BOTH ENDS A, connection_type: THREADED EXTERNAL BOSS ALL ENDS, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS, nominal_thread_size: 0.4375 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 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
AS21916
NSN: 4730-00-052-7349
FSC: 4730
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
reducer_typeCONCENTRIC
thread_class3A BOTH ENDS A
connection_typeTHREADED EXTERNAL BOSS ALL ENDS
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
nominal_thread_size0.4375 INCHES SECOND END IN
nominal_overall_length1.344 INCHES IN
end_item_identificationC-5
thread_quantity_per_inch20 SECOND END
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) BOTH ENDS
part_name_assigned_by_controlling_agencyREDUCER, EXTERNAL THREAD, FLARELESS TUBE
NSN4730-00-052-7349
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS21916 · 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
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 12
D10008-8Same_fscGOVERNMENT REGISTRY
same_fsc cross-reference
same_fsc
AC1034C08Same_fscGOVERNMENT REGISTRY
same_fsc cross-reference
same_fsc
D10008-12Same_fscGOVERNMENT REGISTRY
same_fsc cross-reference
same_fsc
LD83023-12Same_fscGOVERNMENT REGISTRY
same_fsc cross-reference
same_fsc
H10008-12Same_fscGOVERNMENT REGISTRY
same_fsc cross-reference
same_fsc
MS21916J4-2InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS21916?
AS21916 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace AS21916?
There are 12 known substitutes for AS21916: D10008-8, AC1034C08, D10008-12 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS21916?
AS21916 is cataloged in the Federal Logistics Information System 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: October 2026