PartsTable
Technical Data Sheet
MS51818-3P ✓ 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, leg_length: 0.780 INCHES NOMINAL THIRD END IN, seat_angle: 12.0 DEGREES SECOND END, thread_class: 2A FIRST END A, connection_type: THREADED EXTERNAL TUBE SECOND END, connection_style: FLARELESS (TUBE) SECOND END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-825-2291, 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
MS51818-3P
NSN: 4730-00-825-2291
FSC: 4730
CAGE: 30327 — IMPERIAL (USA)
SPECIFICATIONS
materialSTEEL OVERALL
leg_length0.780 INCHES NOMINAL THIRD END IN
seat_angle12.0 DEGREES SECOND END
thread_class2A FIRST END A
connection_typeTHREADED EXTERNAL TUBE SECOND END
connection_styleFLARELESS (TUBE) SECOND END
special_featuresGRUMMAN AIRCRAFT MODEL A10
surface_treatmentPHOSPHATE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.438 INCHES FIRST END IN
maximum_operating_temp121.0 CELSIUS SINGLE RESPONSE DEGC
media_for_which_designedOIL SINGLE RESPONSE
NSN4730-00-825-2291
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51818-3P · 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
MATERIAL: STEEL OVERALL
SPECIFICATION/STANDARD DATA: 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NOMINAL THREAD SIZE: 0.438 INCHES FIRST END IN
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-631 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATOR: UNF SECOND END
CONNECTION STYLE: FLARELESS (TUBE) SECOND END
LEG LENGTH: 0.890 INCHES NOMINAL FIRST END IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
SPECIFICATION/STANDARD DATA81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NOMINAL THREAD SIZE0.438 INCHES FIRST END IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-631 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATORUNF SECOND END
CONNECTION STYLEFLARELESS (TUBE) SECOND END
CONNECTION STYLEFLARELESS (TUBE) FIRST END
LEG LENGTH0.890 INCHES NOMINAL FIRST END IN
CONNECTION STYLEPLAIN (PIPE) THIRD END
THREAD CLASS2A SECOND END A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
28845Interchangeable
interchangeable cross-reference
interchangeable
40311Interchangeable
interchangeable cross-reference
interchangeable
717801500-001Interchangeable
interchangeable cross-reference
interchangeable
T4174Interchangeable
interchangeable cross-reference
interchangeable
39142Interchangeable
interchangeable cross-reference
interchangeable
SSBAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51818-3P?
MS51818-3P is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51818-3P?
There are 13 known substitutes for MS51818-3P: 28845, 40311, 717801500-001 and 10 more. Substitute compatibility should be verified for your specific system.
Is MS51818-3P still available?
MS51818-3P is currently cancelled.
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