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MS21915-6-4J — ADAPTER,STRAIGHT,TUBE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

MS21915-6-4J: ADAPTER,STRAIGHT,TUBE TO BOSS.

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, reducer_type: CONCENTRIC, thread_class: 3A SECOND END A, connection_style: GASKET SEAL (BOSS) FIRST END, surface_treatment: PASSIVATE OVERALL, operating_pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-088-6784, 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
MS21915-6-4J
NSN: 4730-00-088-6784
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
reducer_typeCONCENTRIC
thread_class3A SECOND END A
connection_styleGASKET SEAL (BOSS) FIRST END
surface_treatmentPASSIVATE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.562 INCHES FIRST END IN
nominal_overall_length1.312 INCHES IN
media_for_which_designedWATER-OIL-GAS SINGLE RESPONSE
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
specification/standard_data96906-MS21915 GOVERNMENT STANDARD
material_document_and_classificationQQ-S-763,CL 304 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-088-6784
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21915-6-4J · 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: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
•
NOMINAL OVERALL LENGTH: 1.312 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763,CL 304 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.438 INCHES SECOND END IN
•
SPECIFICATION/STANDARD DATA: 96906-MS21915 GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
CONNECTION STYLEGASKET SEAL (BOSS) FIRST END
NOMINAL OVERALL LENGTH1.312 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763,CL 304 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.438 INCHES SECOND END IN
NOMINAL THREAD SIZE0.562 INCHES FIRST END IN
SPECIFICATION/STANDARD DATA96906-MS21915 GOVERNMENT STANDARD
SURFACE TREATMENTPASSIVATE OVERALL
MEDIA FOR WHICH DESIGNEDWATER-OIL-GAS SINGLE RESPONSE
SUBSTITUTES & CROSS-REFERENCES 5
AS21915Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
4730PL1365215Reference document
Same NSN cross-reference
Reference document — Informative reference only
4730000886784Reference document
Same NSN cross-reference
Reference document — Informative reference only
MS21915J6-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS21915-6-4J?
MS21915-6-4J is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS21915-6-4J?
There are 5 known substitutes for MS21915-6-4J: AS21915, SAE-AS18280, 4730PL1365215 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21915-6-4J?
MS21915-6-4J is cataloged in the U.S. Government catalog under NSN 4730-00-088-6784. This indicates validated use in U.S. government and defense supply chains.
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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.