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Technical Data Sheet
PartsTable / COMPONENT / MS21909W6
MS21909W6 ✓ 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

RESISTOR,VARIABLE,WIRE WOUND,NON. Key specifications include material: ALUMINUM ALLOY 7075 OVERALL, leg_length: 1.062 INCHES NOMINAL FIRST END1.062 INCHES NOMINAL FIRST END IN, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDSTHREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARELESS (TUBE) ALL ENDSFLARELESS (TUBE) ALL ENDS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-289-2698, 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
MS21909W6
NSN: 4730-00-289-2698
FSC: 4730
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075 OVERALL
leg_length1.062 INCHES NOMINAL FIRST END1.062 INCHES NOMINAL FIRST END IN
seat_angle12.0 DEGREES ALL ENDS
thread_class3A ALL ENDS3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDSTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARELESS (TUBE) ALL ENDSFLARELESS (TUBE) ALL ENDS
surface_treatmentANODIZE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.562 INCHES ALL ENDS0.562 INCHES ALL ENDS IN
maximum_operating_temp135.0 CELSIUS SINGLE RESPONSE135.0 CELSIUS SINGLE RESPONSE DEGC
end_item_identificationS-3A VIKING AIRCRAFTS-3A VIKING AIRCRAFT A
media_for_which_designedAERONAUTICAL FLUID SINGLE RESPONSE
NSN4730-00-289-2698
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21909W6 · 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
•
SURFACE TREATMENT: ANODIZE OVERALL
•
THREAD CLASS: 3A THIRD END BULKHEAD3A THIRD END BULKHEAD A
•
LEG LENGTH: 1.086 INCHES NOMINAL SECOND END1.086 INCHES NOMINAL SECOND END IN
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDSTHREADED EXTERNAL TUBE ALL ENDS
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) THIRD END BULKHEAD
•
CONNECTION STYLE: FLARELESS (TUBE) ALL ENDSFLARELESS (TUBE) ALL ENDS
•
MATERIAL: ALUMINUM ALLOY OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTANODIZE OVERALL
THREAD CLASS3A THIRD END BULKHEAD3A THIRD END BULKHEAD A
LEG LENGTH1.086 INCHES NOMINAL SECOND END1.086 INCHES NOMINAL SECOND END IN
THREAD CLASS3A ALL ENDS3A ALL ENDS A
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDSTHREADED EXTERNAL TUBE ALL ENDS
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) THIRD END BULKHEAD
CONNECTION STYLEFLARELESS (TUBE) ALL ENDSFLARELESS (TUBE) ALL ENDS
MATERIALALUMINUM ALLOY OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SPECIFICATION/STANDARD DATA81343-SAE AS21909 GOVERNMENT STANDARD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
AT-2Interchangeable
interchangeable cross-reference
interchangeable
15613Interchangeable
interchangeable cross-reference
interchangeable
RT-11Interchangeable
interchangeable cross-reference
interchangeable
AS954 TY2CL3STBInterchangeable
interchangeable cross-reference
interchangeable
XV1618Interchangeable
interchangeable cross-reference
interchangeable
DN15613Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21909W6?
MS21909W6 is a RESISTOR,VARIABLE,WIRE WOUND,NON.
What parts can replace MS21909W6?
There are 16 known substitutes for MS21909W6: AT-2, 15613, RT-11 and 13 more. Substitute compatibility should be verified for your specific system.
Is MS21909W6 still available?
MS21909W6 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