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PartsTable / COMPONENT / M21 SPECIAL
M21 SPECIAL ✓ Verified by PartsTable
— · COMPONENT
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,FIXED,MICA DIELECTRIC. Key specifications include general_characteristics_item_description: CONSISTS OF MS28778-10 O-RING 1, G502 SENSOR 1, 4299B ADAPTER 1, MS9021-116 O-RING 1. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4440-00-008-4864, 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
M21 SPECIAL
NSN: 4440-00-008-4864
FSC: 4440
CAGE: 27970 — PANAMETRICS LLC (USA)
SPECIFICATIONS
general_characteristics_item_descriptionCONSISTS OF MS28778-10 O-RING 1, G502 SENSOR 1, 4299B ADAPTER 1, MS9021-116 O-RING 1
NSN4440-00-008-4864
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,MICA DIELECTRIC TITLE COMPONENT PN M21 SPECIAL MFR CAPACITOR,FIXED,MICA D
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: CONSISTS OF MS28778-10 O-RING 1, G502 SENSOR 1, 4299B ADAPTER 1, MS9021-116 O-RING 1
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)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONCONSISTS OF MS28778-10 O-RING 1, G502 SENSOR 1, 4299B ADAPTER 1, MS9021-116 O-RING 1
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
M21Interchangeable
interchangeable cross-reference
interchangeable
1377-M500Interchangeable
interchangeable cross-reference
interchangeable
8875978Interchangeable
interchangeable cross-reference
interchangeable
81221Interchangeable
interchangeable cross-reference
interchangeable
08834181221Interchangeable
interchangeable cross-reference
interchangeable
MT1045ARN30Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M21 SPECIAL?
M21 SPECIAL is a CAPACITOR,FIXED,MICA DIELECTRIC.
What parts can replace M21 SPECIAL?
There are 16 known substitutes for M21 SPECIAL: M21, 1377-M500, 8875978 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M21 SPECIAL?
M21 SPECIAL is cataloged in the Federal Logistics Information System (FLIS) under NSN 4440-00-008-4864. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026