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Technical Data Sheet
PartsTable / COMPONENT / MS51525B6-4S
MS51525B6-4S ✓ 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 CORROSION RESISTING BODY, seat_angle: 37.0 DEGREES ALL ENDS, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS SECOND END, surface_treatment: PASSIVATE BODY, nominal_thread_size: 0.562 INCHES ALL ENDS IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-569-2648, 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
MS51525B6-4S
NSN: 4730-01-569-2648
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING BODY
seat_angle37.0 DEGREES ALL ENDS
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS SECOND END
surface_treatmentPASSIVATE BODY
nominal_thread_size0.562 INCHES ALL ENDS IN
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorUNF ALL ENDS
nominal_outside_diameter_tube_accommodated0.375 INCHES FIRST END IN
NSN4730-01-569-2648
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51525B6-4S · 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
•
MEDIA FOR WHICH DESIGNED: HYDRAULIC FLUID SINGLE RESPONSE
•
SURFACE TREATMENT: PASSIVATE BODY
•
NOMINAL THREAD SIZE: 0.562 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.375 INCHES FIRST END IN
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST END
•
THREAD CLASS: 2A ALL ENDS A
•
SEAT ANGLE: 37.0 DEGREES ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
MEDIA FOR WHICH DESIGNEDHYDRAULIC FLUID SINGLE RESPONSE
SURFACE TREATMENTPASSIVATE BODY
NOMINAL THREAD SIZE0.562 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORUNF ALL ENDS
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.375 INCHES FIRST END IN
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
THREAD CLASS2A ALL ENDS A
SEAT ANGLE37.0 DEGREES ALL ENDS
MATERIALSTEEL CORROSION RESISTING BODY
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
C5315X6X8Interchangeable
interchangeable cross-reference
interchangeable
6-8F5BXSInterchangeable
interchangeable cross-reference
interchangeable
MS51525A6-8Interchangeable
interchangeable cross-reference
interchangeable
10-12F5X-SSInterchangeable
interchangeable cross-reference
interchangeable
MS51525B10-12Interchangeable
interchangeable cross-reference
interchangeable
10-12F5BXSSInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51525B6-4S?
MS51525B6-4S is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51525B6-4S?
There are 16 known substitutes for MS51525B6-4S: C5315X6X8, 6-8F5BXS, MS51525A6-8 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51525B6-4S?
MS51525B6-4S is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-569-2648. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026