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MS51819-1 — Technical Data Sheet

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— · 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,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seat_angle: 12.0 DEGREES FIRST END, thread_class: 2A FIRST END A, connection_type: THREADED EXTERNAL PIPE SECOND END, connection_style: FLARELESS (TUBE) FIRST END, operating_pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This part is cataloged in the Federal Logistics Information System under NSN 4730-00-193-1915, 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
MS51819-1
NSN: 4730-00-193-1915
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
seat_angle12.0 DEGREES FIRST END
thread_class2A FIRST END A
connection_typeTHREADED EXTERNAL PIPE SECOND END
connection_styleFLARELESS (TUBE) FIRST END
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.312 INCHES FIRST END IN
nominal_overall_length1.040 INCHES IN
end_item_identificationGRUMMAN AEROSPACE A-10 AIRCRAFT
thread_series_designatorUNF FIRST END
nondefinitive_spec/std_data19A FIGURE A
specification/standard_data96906-MS51819 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN4730-00-193-1915
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51819-1 · 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: 1.040 INCHES IN
•
SEAT ANGLE: 12.0 DEGREES FIRST END
•
MATERIAL: STEEL OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.125 INCHES FIRST END IN
•
FURNISHED ITEMS AND QUANTITY: 1 FERRULE SLEEVE AND 1 SHORT COUPLING NUT
•
SPECIFICATION/STANDARD DATA: 96906-MS51819 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
NOMINAL THREAD SIZE: 0.125 INCHES SECOND END IN
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
TECHNICAL CHARACTERISTICS
NOMINAL OVERALL LENGTH1.040 INCHES IN
SEAT ANGLE12.0 DEGREES FIRST END
MATERIALSTEEL OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.125 INCHES FIRST END IN
FURNISHED ITEMS AND QUANTITY1 FERRULE SLEEVE AND 1 SHORT COUPLING NUT
SPECIFICATION/STANDARD DATA96906-MS51819 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NOMINAL THREAD SIZE0.125 INCHES SECOND END IN
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.312 INCHES FIRST END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
B35N4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
2834InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
7703729P15InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
9159833InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
89-422-36InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
C5-3R30HMP0RM5PCTInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51819-1?
MS51819-1 is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace MS51819-1?
There are 19 known substitutes for MS51819-1: B35N4, 2834, 7703729P15 and 16 more. Substitute compatibility should be verified for your specific system.
Is MS51819-1 still available?
MS51819-1 is currently cancelled.
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Last verified: September 2026