PartsTable
Technical Data Sheet
PartsTable / MRO / 3981
3981 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include material: SILICON SEMICONDUCTOR, bore_shape: STRAIGHT, cone_width: 1.1830 INCHES NOMINAL IN, shaft_type: ROUND SINGLE SHAFT, flange_width: 0.0420 INCHES NOMINAL IN, shaft_length: 0.343 INCHES NOMINAL SINGLE SHAFT IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4520-00-068-0294, 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
MRO→ MRO_GENERAL→ 3981
NSN: 4520-00-068-0294
FSC: 4520
CAGE: 02728 — MANUFACTURER'S COMMERCIAL FINANCE, LLC DBA ELECTRO-FLEX HEAT (USA)
SPECIFICATIONS
materialSILICON SEMICONDUCTOR
bore_shapeSTRAIGHT
cone_width1.1830 INCHES NOMINAL IN
shaft_typeROUND SINGLE SHAFT
flange_width0.0420 INCHES NOMINAL IN
shaft_length0.343 INCHES NOMINAL SINGLE SHAFT IN
thread_class2B
bore_diameter0.1875 INCHES NOMINAL IN
inclosure_typeUNINCLOSED
load_directionRADIAL
overall_length5.273 INCHES NOMINAL IN
surface_finishGROUND
NSN4520-00-068-0294
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,VARIABLE,AIR DIELECTRI TITLE COMPONENT PN 3981 MFR CAPACITOR,VARIABLE,AIR
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
MIL-HDBK-300(PME)Interchangeable
interchangeable cross-reference
interchangeable
4310Interchangeable
interchangeable cross-reference
interchangeable
3981Interchangeable
interchangeable cross-reference
interchangeable
BT3981Interchangeable
interchangeable cross-reference
interchangeable
1227-4310Interchangeable
interchangeable cross-reference
interchangeable
9230Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3981?
3981 is a CAPACITOR,VARIABLE,AIR DIELECTRI. It is classified as a MRO (MRO_GENERAL).
What parts can replace 3981?
There are 23 known substitutes for 3981: MIL-HDBK-300(PME), 4310, 3981 and 20 more. Substitute compatibility should be verified for your specific system.
Is 3981 still available?
3981 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