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MS51523A4 — Technical Data Sheet

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— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, flow_angle: 45.0 DEGREES, leg_length: 1.220 INCHES MINIMUM AND 1.280 INCHES MAXIMUM FIRST END IN, seat_angle: 12.0 DEGREES FIRST END, thread_class: 2A FIRST END A, connection_type: THREADED EXTERNAL PIPE SECOND END. This part is cataloged in the Federal Logistics Information System under NSN 4730-00-618-5382, 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
MS51523A4
NSN: 4730-00-618-5382
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
flow_angle45.0 DEGREES
leg_length1.220 INCHES MINIMUM AND 1.280 INCHES MAXIMUM FIRST END IN
seat_angle12.0 DEGREES FIRST END
thread_class2A FIRST END A
connection_typeTHREADED EXTERNAL PIPE SECOND END
connection_styleFLARELESS (TUBE) FIRST END
style_designatorELBOW
surface_treatmentPASSIVATE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.500 INCHES FIRST END IN
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
NSN4730-00-618-5382
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51523A4 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
100744-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
100744InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A7375333InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A837InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS51523B4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4R6XSInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51523A4?
MS51523A4 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51523A4?
There are 19 known substitutes for MS51523A4: 100744-1, 100744, A7375333 and 16 more. Substitute compatibility should be verified for your specific system.
Is MS51523A4 still available?
MS51523A4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026