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M51519B4S — ADAPTER,STRAIGHT,TUBE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

M51519B4S: ADAPTER,STRAIGHT,TUBE TO BOSS.

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS ALL ENDS, connection_style: FLARED W/ GASKET SEAL (BOSS) ALL ENDS, style_designator: FLARED W/ CENTER WRENCHING FACILITY, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-292-8811, 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
M51519B4S
NSN: 4730-01-292-8811
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 CORROSION RESISTING OVERALL
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS ALL ENDS
connection_styleFLARED W/ GASKET SEAL (BOSS) ALL ENDS
style_designatorFLARED W/ CENTER WRENCHING FACILITY
surface_treatmentPASSIVATE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.438 INCHES ALL ENDS IN
maximum_operating_temp121.0 CELSIUS SINGLE RESPONSE DEGC
nominal_overall_length1.370 INCHES IN
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorUNF ALL ENDS
NSN4730-01-292-8811
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: M51519B4S · 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: QQ-P-35 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CONNECTION STYLE: FLARED W/ GASKET SEAL (BOSS) ALL ENDS
•
NOMINAL OVERALL LENGTH: 1.370 INCHES IN
•
CONNECTION TYPE: THREADED EXTERNAL BOSS ALL ENDS
•
STYLE DESIGNATOR: FLARED W/ CENTER WRENCHING FACILITY
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
•
SPECIFICATION/STANDARD DATA: 96906-MS51519-B4S GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
CONNECTION STYLEFLARED W/ GASKET SEAL (BOSS) ALL ENDS
NOMINAL OVERALL LENGTH1.370 INCHES IN
CONNECTION TYPETHREADED EXTERNAL BOSS ALL ENDS
STYLE DESIGNATORFLARED W/ CENTER WRENCHING FACILITY
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
SPECIFICATION/STANDARD DATA96906-MS51519-B4S GOVERNMENT STANDARD
MAXIMUM OPERATING TEMP121.0 CELSIUS SINGLE RESPONSE DEGC
SURFACE TREATMENTPASSIVATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 4
4LHTX-SSReference document
Same NSN cross-reference
Reference document — Secondary reference
MS51519-B4SReference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-F-18866Reference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-DTL-18866Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M51519B4S?
M51519B4S is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace M51519B4S?
There are 4 known substitutes for M51519B4S: 4LHTX-SS, MS51519-B4S, MIL-F-18866 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M51519B4S?
M51519B4S is cataloged in the U.S. Government catalog under NSN 4730-01-292-8811. 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.