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Technical Data Sheet
PartsTable / COMPONENT / MIL-F-18866
MIL-F-18866 ✓ 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 end_item_identification: ARMORED COMBAT EARTHMOVER,NSN 2430-01-581-8572; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS). This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-004-0737, 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-F-18866
NSN: 4730-00-004-0737
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
end_item_identificationARMORED COMBAT EARTHMOVER,NSN 2430-01-581-8572; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
NSN4730-00-004-0737
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MIL-F-18866 · 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
•
MAXIMUM OPERATING TEMP: 107.2 CELSIUS SINGLE RESPONSE DEGC
•
SPECIFICATION/STANDARD DATA: 96906-MS51527 GOVERNMENT STANDARD
•
NOMINAL THREAD SIZE: 0.312 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
SEAT ANGLE: 37.0 DEGREES FIRST END
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MAXIMUM OPERATING TEMP107.2 CELSIUS SINGLE RESPONSE DEGC
SPECIFICATION/STANDARD DATA96906-MS51527 GOVERNMENT STANDARD
NOMINAL THREAD SIZE0.312 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORUNF ALL ENDS
SEAT ANGLE37.0 DEGREES FIRST END
MATERIALSTEEL CORROSION RESISTING OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
FLOW ANGLE90.0 DEGREES
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
3132555Interchangeable
Same NIIN cross-reference
interchangeable
483006-1Interchangeable
Same NIIN cross-reference
interchangeable
MS51527A2SInterchangeable
Same NIIN cross-reference
interchangeable
2C5BXSSInterchangeable
Same NIIN cross-reference
interchangeable
MS51527B2SInterchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-18866Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-F-18866?
MIL-F-18866 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace MIL-F-18866?
There are 6 known substitutes for MIL-F-18866: 3132555, 483006-1, MS51527A2S and 3 more. Substitute compatibility should be verified for your specific system.
Is MIL-F-18866 still available?
MIL-F-18866 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