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MS21900W12 — ADAPTER,STRAIGHT,FLANGE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21900W12: ADAPTER,STRAIGHT,FLANGE TO TUBE.

ADAPTER,STRAIGHT,FLANGE TO TUBE. Key specifications include material: ALUMINUM ALLOY 7075 OVERALL, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS ALL ENDS, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END, special_features: MATERIAL: ALUMINUM ALLOY (7075) IAW AMS-QQ-A-225/9. FINISH: ANODIZED IAW AMS2472.

BROWN IN COLOR. WEIGHT: 0.109 LB. LBS, style_designator: FLARED AND FLARELESS W/ CENTER WRENCHING FACILITY.

This part is cataloged in the U.S. Government catalog under NSN 4730-01-708-6719, 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
MS21900W12
NSN: 4730-01-708-6719
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075 OVERALL
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS ALL ENDS
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
special_featuresMATERIAL: ALUMINUM ALLOY (7075) IAW AMS-QQ-A-225/9. FINISH: ANODIZED IAW AMS2472. BROWN IN COLOR. WEIGHT: 0.109 LB. LBS
style_designatorFLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
surface_treatmentANODIZE OVERALL
operating_pressure900.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size1.0625 INCHES ALL ENDS IN
nominal_overall_length1.938 INCHES IN
thread_quantity_per_inch12 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT (UNJ) ALL ENDS
NSN4730-01-708-6719
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21900W12 · 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 DOCUMENT AND CLASSIFICATION: AMS2472 INTERNATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL
•
CONNECTION STYLE: FLARED W/ GASKET SEAL (BOSS) FIRST END
•
NOMINAL OVERALL LENGTH: 1.938 INCHES IN
•
CONNECTION TYPE: THREADED EXTERNAL BOSS ALL ENDS
•
STYLE DESIGNATOR: FLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS-QQ-A-225/9 AEROSPACE MATERIAL SPEC STD ALL MATERIAL RESPONSES OVERALL
•
OPERATING PRESSURE: 900.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS2472 INTERNATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL
CONNECTION STYLEFLARED W/ GASKET SEAL (BOSS) FIRST END
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
NOMINAL OVERALL LENGTH1.938 INCHES IN
CONNECTION TYPETHREADED EXTERNAL BOSS ALL ENDS
STYLE DESIGNATORFLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
MATERIAL DOCUMENT AND CLASSIFICATIONAMS-QQ-A-225/9 AEROSPACE MATERIAL SPEC STD ALL MATERIAL RESPONSES OVERALL
OPERATING PRESSURE900.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE1.0625 INCHES ALL ENDS IN
SPECIFICATION/STANDARD DATA0U583-AS21900 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 0U583-AS18280 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SUBSTITUTES & CROSS-REFERENCES 1
AS21900 REV DReference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS21900W12?
MS21900W12 is a ADAPTER,STRAIGHT,FLANGE TO TUBE.
What parts can replace MS21900W12?
There is 1 known substitute for MS21900W12: AS21900 REV D. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21900W12?
MS21900W12 is cataloged in the U.S. Government catalog under NSN 4730-01-708-6719. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.