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MS21900K5 — ADAPTER,STRAIGHT,FLANGE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21900K5: ADAPTER,STRAIGHT,FLANGE TO TUBE.

ADAPTER,STRAIGHT,FLANGE TO TUBE. Key specifications include material: STEEL COMP 316 OVERALL, thread_class: 3A ALL ENDS A, connection_style: FLARED W/ GASKET SEAL (BOSS) FIRST END, style_designator: FLARED AND FLARELESS W/ CENTER WRENCHING FACILITY, nominal_thread_size: 0.5000 INCHES ALL ENDS IN, nominal_overall_length: 1.156 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-708-4192, 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
MS21900K5
NSN: 4730-01-708-4192
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
thread_class3A ALL ENDS A
connection_styleFLARED W/ GASKET SEAL (BOSS) FIRST END
style_designatorFLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
nominal_thread_size0.5000 INCHES ALL ENDS IN
nominal_overall_length1.156 INCHES IN
thread_quantity_per_inch20 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
specification/standard_data0U583-AS21900 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
part_name_assigned_by_controlling_agencyADAPTER FLARELESS TUBE TO A FLARED TUBE
NSN4730-01-708-4192
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21900K5 · 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
•
CONNECTION STYLE: FLARED W/ GASKET SEAL (BOSS) FIRST END
•
NOMINAL OVERALL LENGTH: 1.156 INCHES IN
•
STYLE DESIGNATOR: FLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
•
NOMINAL THREAD SIZE: 0.5000 INCHES ALL ENDS IN
•
SPECIFICATION/STANDARD DATA: 0U583-AS21900 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
THREAD CLASS: 3A ALL ENDS A
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARED W/ GASKET SEAL (BOSS) FIRST END
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
NOMINAL OVERALL LENGTH1.156 INCHES IN
STYLE DESIGNATORFLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
NOMINAL THREAD SIZE0.5000 INCHES ALL ENDS IN
SPECIFICATION/STANDARD DATA0U583-AS21900 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
PART NAME ASSIGNED BY CONTROLLING AGENCYADAPTER FLARELESS TUBE TO A FLARED TUBE
THREAD CLASS3A ALL ENDS A
THREAD QUANTITY PER INCH20 ALL ENDS
MATERIALSTEEL COMP 316 OVERALL
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS21900K5?
MS21900K5 is a ADAPTER,STRAIGHT,FLANGE TO TUBE.
What parts can replace MS21900K5?
There is 1 known substitute for MS21900K5: AS21900 REV D. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21900K5?
MS21900K5 is cataloged in the U.S. Government catalog under NSN 4730-01-708-4192. 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.