PartsTable
Technical Data Sheet
MS51811-18 ✓ 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 12L14 OVERALL, leg_length: 1.580 INCHES NOMINAL ALL ENDS IN, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARELESS (TUBE) ALL ENDS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-022-8223, 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
MS51811-18
NSN: 4730-01-022-8223
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 12L14 OVERALL
leg_length1.580 INCHES NOMINAL ALL ENDS IN
seat_angle12.0 DEGREES ALL ENDS
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARELESS (TUBE) ALL ENDS
surface_treatmentCADMIUM OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size1.062 INCHES ALL ENDS IN
maximum_operating_temp121.0 CELSIUS SINGLE RESPONSE DEGC
thread_quantity_per_inch12 ALL ENDS
thread_series_designatorUN ALL ENDS
NSN4730-01-022-8223
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51811-18 · 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
FURNISHED ITEMS AND QUANTITY: 3 TUBE COUPLING NUT W/SLEEVE
SURFACE TREATMENT: CADMIUM OVERALL
MATERIAL: STEEL COMP 12L14 OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.750 INCHES ALL ENDS IN
NOMINAL THREAD SIZE: 1.062 INCHES ALL ENDS IN
THREAD QUANTITY PER INCH: 12 ALL ENDS
THREAD SERIES DESIGNATOR: UN ALL ENDS
MAXIMUM OPERATING TEMP: 121.0 CELSIUS SINGLE RESPONSE DEGC
TECHNICAL CHARACTERISTICS (FLIS)
FURNISHED ITEMS AND QUANTITY3 TUBE COUPLING NUT W/SLEEVE
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL COMP 12L14 OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.750 INCHES ALL ENDS IN
NOMINAL THREAD SIZE1.062 INCHES ALL ENDS IN
THREAD QUANTITY PER INCH12 ALL ENDS
THREAD SERIES DESIGNATORUN ALL ENDS
MAXIMUM OPERATING TEMP121.0 CELSIUS SINGLE RESPONSE DEGC
LEG LENGTH1.580 INCHES NOMINAL ALL ENDS IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
75109AInterchangeable
interchangeable cross-reference
interchangeable
454124Interchangeable
interchangeable cross-reference
interchangeable
BM11378-31Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-18866Interchangeable
Same NIIN cross-reference
interchangeable
MIL-F-18866Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51811-18?
MS51811-18 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MS51811-18?
There are 5 known substitutes for MS51811-18: 75109A, 454124, BM11378-31 and 2 more. Substitute compatibility should be verified for your specific system.
Is MS51811-18 still available?
MS51811-18 is currently cancelled.
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