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Technical Data Sheet
PartsTable / COMPONENT / MIL-DTL-18866J
MIL-DTL-18866J ✓ 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 CORROSION RESISTING OVERALL, leg_length: 0.891 INCHES NOMINAL SECOND END IN, seat_angle: 37.0 DEGREES FIRST END, thread_class: 2A SECOND END A, connection_type: THREADED EXTERNAL PIPE THIRD END, connection_style: FLARELESS (TUBE) FIRST END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-019-1489, 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
MIL-DTL-18866J
NSN: 4730-00-019-1489
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
leg_length0.891 INCHES NOMINAL SECOND END IN
seat_angle37.0 DEGREES FIRST END
thread_class2A SECOND END A
connection_typeTHREADED EXTERNAL PIPE THIRD END
connection_styleFLARELESS (TUBE) FIRST END
nominal_thread_size0.438 INCHES FIRST END IN
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) FIRST END
nondefinitive_spec/std_data22D FIGURE
specification/standard_data81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 96906-MS51818 GOVERNMENT STANDARD
furnished_items_and_quantity2 TUBE COUPLING NUT W/SLEEVE
NSN4730-00-019-1489
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MIL-DTL-18866J · 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
•
LEG LENGTH: 2.062 INCHES NOMINAL FIRST END IN
•
CONNECTION STYLE: FLARED (TUBE) FIRST END
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 1.250 INCHES FIRST END IN
•
SPECIFICATION/STANDARD DATA: 96906-MS51527 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
NONDEFINITIVE SPEC/STD DATA: 10A FIGURE A
•
NOMINAL THREAD SIZE: 1.625 INCHES ALL ENDS IN
•
FURNISHED ITEMS AND QUANTITY: 1 FLARED SLEEVE AND 1 LOCKNUT AND 1 SHORT COUPLING NUT AND 1 FLAT WASHER
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
LEG LENGTH2.062 INCHES NOMINAL FIRST END IN
CONNECTION STYLEFLARED (TUBE) FIRST END
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.250 INCHES FIRST END IN
SPECIFICATION/STANDARD DATA96906-MS51527 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NONDEFINITIVE SPEC/STD DATA10A FIGURE A
NOMINAL THREAD SIZE1.625 INCHES ALL ENDS IN
FURNISHED ITEMS AND QUANTITY1 FLARED SLEEVE AND 1 LOCKNUT AND 1 SHORT COUPLING NUT AND 1 FLAT WASHER
MATERIALSTEEL OVERALL
SEAT ANGLE37.0 DEGREES FIRST END
THREAD QUANTITY PER INCH12 ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 31
701607Interchangeable
interchangeable cross-reference
interchangeable
4730010260446Interchangeable
interchangeable cross-reference
interchangeable
4730PL0649962Interchangeable
interchangeable cross-reference
interchangeable
6BCACInterchangeable
interchangeable cross-reference
interchangeable
7-445-080645Interchangeable
interchangeable cross-reference
interchangeable
60244-90155Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-DTL-18866J?
MIL-DTL-18866J is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MIL-DTL-18866J?
There are 31 known substitutes for MIL-DTL-18866J: 701607, 4730010260446, 4730PL0649962 and 28 more. Substitute compatibility should be verified for your specific system.
Is MIL-DTL-18866J still available?
MIL-DTL-18866J 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