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Technical Data Sheet
PartsTable / COMPONENT / MS51523-B8
MS51523-B8 ✓ Verified by PartsTable
— · 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,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: STEEL BODY, leg_length: 1.250 INCHES NOMINAL SECOND END IN, seat_angle: 37.0 DEGREES THIRD END, thread_class: 2A SECOND END A, connection_type: THREADED EXTERNAL TUBE SECOND END, connection_style: FLARED (TUBE) SECOND END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-491-4983, 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
MS51523-B8
NSN: 4730-00-491-4983
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL BODY
leg_length1.250 INCHES NOMINAL SECOND END IN
seat_angle37.0 DEGREES THIRD END
thread_class2A SECOND END A
connection_typeTHREADED EXTERNAL TUBE SECOND END
connection_styleFLARED (TUBE) SECOND END
nominal_thread_size0.750 INCHES THIRD END IN
thread_series_designatorUNF FIRST END
nominal_outside_diameter_tube_accommodated0.500 INCHES FIRST END IN
NSN4730-00-491-4983
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51523-B8 · 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 22
218845Interchangeable
interchangeable cross-reference
interchangeable
58A164B542Interchangeable
interchangeable cross-reference
interchangeable
17062Interchangeable
interchangeable cross-reference
interchangeable
LMT7540043Interchangeable
interchangeable cross-reference
interchangeable
7540043Interchangeable
interchangeable cross-reference
interchangeable
17062ADXInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51523-B8?
MS51523-B8 is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace MS51523-B8?
There are 22 known substitutes for MS51523-B8: 218845, 58A164B542, 17062 and 19 more. Substitute compatibility should be verified for your specific system.
Is MS51523-B8 still available?
MS51523-B8 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: July 2026