PartsTable
Technical Data Sheet
MS51880-4 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: COPPER ALLOY OVERALL, leg_length: 0.422 INCHES NOMINAL ALL ENDS IN, seat_angle: 42.0 DEGREES ALL ENDS, thread_class: 2B ALL ENDS, connection_type: THREADED INTERNAL TUBE ALL ENDS, connection_style: INVERTED FLARE (PIPE) ALL ENDS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-287-1707, 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
MS51880-4
NSN: 4730-00-287-1707
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
leg_length0.422 INCHES NOMINAL ALL ENDS IN
seat_angle42.0 DEGREES ALL ENDS
thread_class2B ALL ENDS
connection_typeTHREADED INTERNAL TUBE ALL ENDS
connection_styleINVERTED FLARE (PIPE) ALL ENDS
nominal_thread_size0.438 INCHES ALL ENDS IN
thread_quantity_per_inch24 ALL ENDS
thread_series_designatorUNS ALL ENDS
nominal_outside_diameter_tube_accommodated0.250 INCHES ALL ENDS IN
NSN4730-00-287-1707
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51880-4 · 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
THREAD CLASS: 2B ALL ENDS
MATERIAL: COPPER ALLOY OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
THREAD SERIES DESIGNATOR: UNS ALL ENDS
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
SEAT ANGLE: 42.0 DEGREES ALL ENDS
THREAD QUANTITY PER INCH: 24 ALL ENDS
LEG LENGTH: 0.422 INCHES NOMINAL ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B ALL ENDS
MATERIALCOPPER ALLOY OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORUNS ALL ENDS
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
SEAT ANGLE42.0 DEGREES ALL ENDS
THREAD QUANTITY PER INCH24 ALL ENDS
LEG LENGTH0.422 INCHES NOMINAL ALL ENDS IN
CONNECTION TYPETHREADED INTERNAL TUBE ALL ENDS
CONNECTION STYLEINVERTED FLARE (PIPE) ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
16195Interchangeable
interchangeable cross-reference
interchangeable
SAE-J512Interchangeable
interchangeable cross-reference
interchangeable
SAE J512 3-3-3 040401BAInterchangeable
interchangeable cross-reference
interchangeable
502-0373Interchangeable
interchangeable cross-reference
interchangeable
S306FHTInterchangeable
interchangeable cross-reference
interchangeable
182-123Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51880-4?
MS51880-4 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace MS51880-4?
There are 18 known substitutes for MS51880-4: 16195, SAE-J512, SAE J512 3-3-3 040401BA and 15 more. Substitute compatibility should be verified for your specific system.
Is MS51880-4 still available?
MS51880-4 is currently cancelled.
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