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MS21902K2 — UNION,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21902K2: UNION,TUBE.

The UNION,TUBE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, thread_class: 3A ALL ENDS A, special_features: CORROSUION RESISTANT STEEL, TYPE 316;WIDTH ACROSS FLATS .563IN, LENGTH 1.063IN IN, style_designator: RIGID, SHORT CENTER WRENCHING FACILITY, nominal_thread_size: 0.312 INCHES ALL ENDS IN, nominal_overall_length: 1.063 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-573-2252, 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
MS21902K2
NSN: 4730-01-573-2252
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
thread_class3A ALL ENDS A
special_featuresCORROSUION RESISTANT STEEL, TYPE 316;WIDTH ACROSS FLATS .563IN, LENGTH 1.063IN IN
style_designatorRIGID, SHORT CENTER WRENCHING FACILITY
nominal_thread_size0.312 INCHES ALL ENDS IN
nominal_overall_length1.063 INCHES IN
end_item_identificationAMAD/PMG GEAR BOX
thread_quantity_per_inch24 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
part_name_assigned_by_controlling_agencyUNION,TUBE,FLAREL
NSN4730-01-573-2252
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21902K2 · 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
•
NOMINAL OVERALL LENGTH: 1.063 INCHES IN
•
STYLE DESIGNATOR: RIGID, SHORT CENTER WRENCHING FACILITY
•
NOMINAL THREAD SIZE: 0.312 INCHES ALL ENDS IN
•
THREAD CLASS: 3A ALL ENDS A
•
THREAD QUANTITY PER INCH: 24 ALL ENDS
TECHNICAL CHARACTERISTICS
NOMINAL OVERALL LENGTH1.063 INCHES IN
STYLE DESIGNATORRIGID, SHORT CENTER WRENCHING FACILITY
NOMINAL THREAD SIZE0.312 INCHES ALL ENDS IN
SPECIAL FEATURESCORROSUION RESISTANT STEEL, TYPE 316;WIDTH ACROSS FLATS .563IN, LENGTH 1.063IN IN
PART NAME ASSIGNED BY CONTROLLING AGENCYUNION,TUBE,FLAREL
THREAD CLASS3A ALL ENDS A
END ITEM IDENTIFICATIONAMAD/PMG GEAR BOX
THREAD QUANTITY PER INCH24 ALL ENDS
MATERIALSTEEL CORROSION RESISTING OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 1
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 MS21902K2?
MS21902K2 is a UNION,TUBE.
What parts can replace MS21902K2?
There is 1 known substitute for MS21902K2: SAE-AS18280. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21902K2?
MS21902K2 is cataloged in the U.S. Government catalog under NSN 4730-01-573-2252. 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.