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Technical Data Sheet
PartsTable / COMPONENT / MS51526B4S
MS51526B4S ✓ 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 COMP 316 OR STEEL COMP 304 OVERALL, seat_angle: 37.0 DEGREES FIRST END, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE FIRST END, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END, surface_treatment: PASSIVATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-052-4000, 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
MS51526B4S
NSN: 4730-01-052-4000
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 316 OR STEEL COMP 304 OVERALL
seat_angle37.0 DEGREES FIRST END
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE FIRST END
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
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_temp-65.0 FAHRENHEIT SECOND RESPONSE DEGF
nominal_overall_length2.080 INCHES IN
media_for_which_designedHYDRAULIC FLUID FIRST RESPONSE
thread_series_designatorUNF ALL ENDS
NSN4730-01-052-4000
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51526B4S · 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
•
CONNECTION TYPE: THREADED EXTERNAL BOSS SECOND END
•
MAXIMUM OPERATING TEMP: 248.0 FAHRENHEIT FIRST RESPONSE DEGF
•
SEAT ANGLE: 37.0 DEGREES FIRST END
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66,300 SERIES FED STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
SPECIFICATION/STANDARD DATA: 96906-MS51526 GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
MAXIMUM OPERATING TEMP248.0 FAHRENHEIT FIRST RESPONSE DEGF
MAXIMUM OPERATING TEMP-65.0 FAHRENHEIT SECOND RESPONSE DEGF
SEAT ANGLE37.0 DEGREES FIRST END
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66,300 SERIES FED STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
SPECIFICATION/STANDARD DATA96906-MS51526 GOVERNMENT STANDARD
FURNISHED ITEMS AND QUANTITY1 SHORT COUPLING NUT WITH SLEEVE
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
849FS 1-4X1-4Interchangeable
interchangeable cross-reference
interchangeable
70922571Interchangeable
interchangeable cross-reference
interchangeable
M2641AInterchangeable
interchangeable cross-reference
interchangeable
MS51526Interchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-18866Interchangeable
Same NIIN cross-reference
interchangeable
4FF5BXSInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51526B4S?
MS51526B4S is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51526B4S?
There are 8 known substitutes for MS51526B4S: 849FS 1-4X1-4, 70922571, M2641A and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51526B4S?
MS51526B4S is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-052-4000. 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