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Technical Data Sheet
PartsTable / COMPONENT / MS21908W4
MS21908W4 ✓ 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: ALUMINUM ALLOY OVERALL, flow_angle: 90.0 DEGREES, leg_length: 0.938 INCHES NOMINAL SECOND END IN, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE FIRST END BULKHEAD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-173-5160, 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
MS21908W4
NSN: 4730-00-173-5160
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
flow_angle90.0 DEGREES
leg_length0.938 INCHES NOMINAL SECOND END IN
seat_angle12.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE FIRST END BULKHEAD
surface_treatmentANODIZE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.438 INCHES ALL ENDS IN
maximum_operating_temp275.0 FAHRENHEIT SINGLE RESPONSE DEGF
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NSN4730-00-173-5160
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21908W4 · 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
•
FLOW ANGLE: 90.0 DEGREES
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-367,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD CLASS: 3A ALL ENDS A
•
SPECIFICATION/STANDARD DATA: 96906-MS21908 GOVERNMENT STANDARD
•
MEDIA FOR WHICH DESIGNED: HYDRAULIC FLUID SINGLE RESPONSE
•
SEAT ANGLE: 12.0 DEGREES ALL ENDS
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
FLOW ANGLE90.0 DEGREES
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-367,T73 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS3A ALL ENDS A
SPECIFICATION/STANDARD DATA96906-MS21908 GOVERNMENT STANDARD
MEDIA FOR WHICH DESIGNEDHYDRAULIC FLUID SINGLE RESPONSE
SPECIFICATION/STANDARD DATA96906-MS21908 GOVERNMENT STANDARD
SEAT ANGLE12.0 DEGREES ALL ENDS
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
REDUCED PASSAGE NOMINAL INSIDE DIAMETER0.188 INCHES ALL ENDS IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
4730PL0973806Interchangeable
Same NIIN cross-reference
interchangeable
AS18280Interchangeable
Same NIIN cross-reference
interchangeable
AS21908Interchangeable
Same NIIN cross-reference
interchangeable
SAE-AS18280Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21908W4?
MS21908W4 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace MS21908W4?
There are 4 known substitutes for MS21908W4: 4730PL0973806, AS18280, AS21908 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21908W4?
MS21908W4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-173-5160. 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