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PartsTable / COMPONENT / MS51515B4
MS51515B4 ✓ 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,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, leg_length: 1.080 INCHES NOMINAL FIRST END IN, seat_angle: 37.0 DEGREES THIRD END, thread_class: 2A THIRD END A, connection_type: THREADED EXTERNAL TUBE FIRST END, connection_style: FLARED (TUBE) FIRST END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-443-4738, 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
MS51515B4
NSN: 4730-00-443-4738
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
leg_length1.080 INCHES NOMINAL FIRST END IN
seat_angle37.0 DEGREES THIRD END
thread_class2A THIRD END A
connection_typeTHREADED EXTERNAL TUBE FIRST END
connection_styleFLARED (TUBE) FIRST END
nominal_thread_size0.438 INCHES FIRST END IN
thread_series_designatorNPTF SECOND END
furnished_items_and_quantity2 SHORT COUPLING NUT WITH SLEEVE
nominal_outside_diameter_tube_accommodated0.250 INCHES THIRD END IN
NSN4730-00-443-4738
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51515B4 · 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 9
60963-2Interchangeable
interchangeable cross-reference
interchangeable
A-03732Interchangeable
interchangeable cross-reference
interchangeable
A3732Interchangeable
interchangeable cross-reference
interchangeable
MS51515B4Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-18866Interchangeable
interchangeable cross-reference
interchangeable
4-4-4 070959Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51515B4?
MS51515B4 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51515B4?
There are 9 known substitutes for MS51515B4: 60963-2, A-03732, A3732 and 6 more. Substitute compatibility should be verified for your specific system.
Is MS51515B4 still available?
MS51515B4 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