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MS21923K4 — ADAPTER,STRAIGHT,TUBE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21923K4: ADAPTER,STRAIGHT,TUBE TO BOSS.

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, thread_class: 3A ALL ENDS A, nominal_length: 1.750 INCHES FIRST END BULKHEAD IN, nominal_thread_size: 0.437 INCHES ALL ENDS IN, nominal_outside_diameter: 0.250 INCHES CENTER BULKHEAD IN, thread_series_designator: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-494-3696, 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
MS21923K4
NSN: 4730-01-494-3696
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
nominal_length1.750 INCHES FIRST END BULKHEAD IN
nominal_thread_size0.437 INCHES ALL ENDS IN
nominal_outside_diameter0.250 INCHES CENTER BULKHEAD IN
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NSN4730-01-494-3696
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21923K4 · 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 LENGTH: 1.750 INCHES FIRST END BULKHEAD IN
•
NOMINAL THREAD SIZE: 0.437 INCHES ALL ENDS IN
•
NOMINAL OUTSIDE DIAMETER: 0.250 INCHES CENTER BULKHEAD IN
•
THREAD CLASS: 3A ALL ENDS A
•
MATERIAL: STEEL COMP 316 OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
TECHNICAL CHARACTERISTICS
NOMINAL LENGTH1.750 INCHES FIRST END BULKHEAD IN
NOMINAL THREAD SIZE0.437 INCHES ALL ENDS IN
NOMINAL OUTSIDE DIAMETER0.250 INCHES CENTER BULKHEAD IN
THREAD CLASS3A ALL ENDS A
MATERIALSTEEL COMP 316 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS21923K4?
MS21923K4 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS21923K4?
There is 1 known substitute for MS21923K4: SAE-AS18280. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21923K4?
MS21923K4 is cataloged in the U.S. Government catalog under NSN 4730-01-494-3696. 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.