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Technical Data Sheet
PartsTable / COMPONENT / MS51860-56SS
MS51860-56SS ✓ 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 LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND, surface_treatment: PASSIVATE OVERALL, nominal_thread_size: 0.750 INCHES IN, thread_quantity_per_inch: 16. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-727-8913, 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
MS51860-56SS
NSN: 4730-00-727-8913
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.750 INCHES IN
thread_quantity_per_inch16
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationQQ-P-35,TY 1 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-P-35 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN4730-00-727-8913
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51860-56SS · 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
•
WIDTH ACROSS FLATS: 1.000 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 25B FIGURE
•
NUT HEIGHT: 0.310 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 16
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.500 INCHES IN
•
SPECIFICATION/STANDARD DATA: 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 96906-MS51860 GOVERNMENT STANDARD AND 81349-MIL-F-18866 GOVERNMENT SPECIFICATION
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS1.000 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
NONDEFINITIVE SPEC/STD DATA25B FIGURE
NUT HEIGHT0.310 INCHES NOMINAL IN
END ITEM IDENTIFICATIONMISC. HYDRAULIC SYSTEMS
THREAD QUANTITY PER INCH16
NOMINAL TUBE OUTSIDE DIAMETER0.500 INCHES IN
SPECIFICATION/STANDARD DATA81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 96906-MS51860 GOVERNMENT STANDARD AND 81349-MIL-F-18866 GOVERNMENT SPECIFICATION
NOMINAL THREAD SIZE0.750 INCHES IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
MIL-F-18866Interchangeable
interchangeable cross-reference
interchangeable
MS28778-8Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-18866Interchangeable
interchangeable cross-reference
interchangeable
SAE J514 8 070118SInterchangeable
Same NIIN cross-reference
interchangeable
11209998-19Interchangeable
Same NIIN cross-reference
interchangeable
8-8 080118SInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51860-56SS?
MS51860-56SS is a LOCKNUT,TUBE FITTING.
What parts can replace MS51860-56SS?
There are 10 known substitutes for MS51860-56SS: MIL-F-18866, MS28778-8, MIL-DTL-18866 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51860-56SS?
MS51860-56SS is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-727-8913. 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