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Technical Data Sheet
PartsTable / COMPONENT / Q2818-4
Q2818-4 ✓ 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

CAPACITOR,FIXED,MICA DIELECTRIC. Key specifications include material: ALUMINUM ALLOY 2014 OVERALL, seat_angle: 37.0 DEGREES, thread_class: 3B INTERNAL, connection_style: PRESSURE SEAL FLARED, special_features: CAP DRILLED FOR SAFETY CHAIN, style_designator: CAP, TUBE, FLARED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-585-8770, 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
Q2818-4
NSN: 4730-00-585-8770
FSC: 4730
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2014 OVERALL
seat_angle37.0 DEGREES
thread_class3B INTERNAL
connection_stylePRESSURE SEAL FLARED
special_featuresCAP DRILLED FOR SAFETY CHAIN
style_designatorCAP, TUBE, FLARED
thread_directionRIGHT-HAND INTERNAL
nominal_thread_size0.438 INCHES INTERNAL IN
end_item_identificationF-16 AND F-18 AIRCRAFT
thread_series_designatorUNF INTERNAL
specification/standard_data88044-AN929 GOVERNMENT STANDARD AND 81343-AS4841 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
tube_outside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN4730-00-585-8770
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: Q2818-4 · 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
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
SPECIFICATION/STANDARD DATA: 88044-AN929 GOVERNMENT STANDARD AND 81343-AS4841 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
STYLE DESIGNATOR: CAP, TUBE, FLARED
•
THREAD DIRECTION: RIGHT-HAND INTERNAL
•
NOMINAL THREAD SIZE: 0.438 INCHES INTERNAL IN
•
MATERIAL: ALUMINUM ALLOY 2014 OVERALL
•
SEAT ANGLE: 37.0 DEGREES
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA88044-AN929 GOVERNMENT STANDARD AND 81343-AS4841 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
STYLE DESIGNATORCAP, TUBE, FLARED
THREAD DIRECTIONRIGHT-HAND INTERNAL
END ITEM IDENTIFICATIONF-16 AND F-18 AIRCRAFT
NOMINAL THREAD SIZE0.438 INCHES INTERNAL IN
MATERIALALUMINUM ALLOY 2014 OVERALL
SEAT ANGLE37.0 DEGREES
THREAD CLASS3B INTERNAL
SPECIAL FEATURESCAP DRILLED FOR SAFETY CHAIN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
M15513-16Interchangeable
interchangeable cross-reference
interchangeable
ATML1704BInterchangeable
interchangeable cross-reference
interchangeable
M6240-743210Interchangeable
interchangeable cross-reference
interchangeable
29496Interchangeable
interchangeable cross-reference
interchangeable
63X1603Interchangeable
interchangeable cross-reference
interchangeable
24760-1 ITEM 7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is Q2818-4?
Q2818-4 is a CAPACITOR,FIXED,MICA DIELECTRIC.
What parts can replace Q2818-4?
There are 15 known substitutes for Q2818-4: M15513-16, ATML1704B, M6240-743210 and 12 more. Substitute compatibility should be verified for your specific system.
Is Q2818-4 still available?
Q2818-4 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