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Technical Data Sheet
PartsTable / COMPONENT / MS51856-3
MS51856-3 ✓ 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, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS ALL ENDS, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS, special_features: NUTS CADMIUM PLATED AND SLEEVES BLACK PHOSPHATES, style_designator: FLARELESS W/ CENTER WRENCHING FACILITY. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-037-5536, 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
MS51856-3
NSN: 4730-01-037-5536
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS ALL ENDS
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
special_featuresNUTS CADMIUM PLATED AND SLEEVES BLACK PHOSPHATES
style_designatorFLARELESS W/ CENTER WRENCHING FACILITY
nominal_thread_size0.437 INCHES ALL ENDS IN
nominal_overall_length1.110 INCHES IN
thread_series_designatorUNF ALL ENDS
nondefinitive_spec/std_data19C FIGURE
specification/standard_data96906-MS51856 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
furnished_items_and_quantity2 TUBE COUPLING NUT W/SLEEVE AND 2 PREFORMED PACKING
NSN4730-01-037-5536
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51856-3 · 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
•
NOMINAL OVERALL LENGTH: 1.110 INCHES IN
•
MATERIAL: STEEL OVERALL
•
NOMINAL THREAD SIZE: 0.437 INCHES ALL ENDS IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: J514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
SPECIFICATION/STANDARD DATA: 96906-MS51856 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL BOSS ALL ENDS
•
FURNISHED ITEMS AND QUANTITY: 2 TUBE COUPLING NUT W/SLEEVE AND 2 PREFORMED PACKING
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL OVERALL LENGTH1.110 INCHES IN
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.437 INCHES ALL ENDS IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONJ514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SPECIFICATION/STANDARD DATA96906-MS51856 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
CONNECTION TYPETHREADED EXTERNAL BOSS ALL ENDS
FURNISHED ITEMS AND QUANTITY2 TUBE COUPLING NUT W/SLEEVE AND 2 PREFORMED PACKING
STYLE DESIGNATORFLARELESS W/ CENTER WRENCHING FACILITY
SPECIAL FEATURESNUTS CADMIUM PLATED AND SLEEVES BLACK PHOSPHATES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
697712Interchangeable
interchangeable cross-reference
interchangeable
4LHBU-SInterchangeable
Same NIIN cross-reference
interchangeable
J514Interchangeable
Same NIIN cross-reference
interchangeable
MIL-F-18866Interchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-18866Interchangeable
Same NIIN cross-reference
interchangeable
MS51856-4Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51856-3?
MS51856-3 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51856-3?
There are 7 known substitutes for MS51856-3: 697712, 4LHBU-S, J514 and 4 more. Substitute compatibility should be verified for your specific system.
Is MS51856-3 still available?
MS51856-3 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