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PartsTable / COMPONENT / B21561
B21561 ✓ 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,CERAMIC DIELECTR. Key specifications include material: STEEL METER CASE, bulb_type: PLAIN RIGID, body_style: PLAIN, SOLID, bore_style: PLAIN BOTH ENDS, bulb_style: PLAIN BULB, scale_type: DIAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3020-00-517-2189, 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
B21561
NSN: 3020-00-517-2189
FSC: 3020
CAGE: 92208 — LITTON SYSTEMS INC ITEK OPTICAL SYSTEMS DIV (USA)
SPECIFICATIONS
materialSTEEL METER CASE
bulb_typePLAIN RIGID
body_stylePLAIN, SOLID
bore_stylePLAIN BOTH ENDS
bulb_stylePLAIN BULB
scale_typeDIAL
tooth_formSTANDARD
bulb_quantity1
case_diameter3.700 INCHES NOMINAL IN
dial_diameter3.500 INCHES NOMINAL IN
pitch_diameter2.6250 INCHES NOMINAL IN
pressure_angle14.5000 DEGREES
NSN3020-00-517-2189
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,CERAMIC DIELECTR TITLE COMPONENT PN B21561 MFR CAPACITOR,FIXED,CERAMI
KEY FEATURES
•
TEETH QUANTITY: 84
•
NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END: 0.625 INCHES SECOND END IN
•
BODY STYLE: PLAIN, SOLID
•
NOMINAL OUTSIDE DIAMETER: 2.6870 INCHES IN
•
TOOTH FORM: STANDARD
•
PRESSURE ANGLE: 14.5000 DEGREES
•
MATERIAL: STEEL COMP 416 OVERALL
•
FACE NOMINAL WIDTH: 0.188 INCHES IN
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)
TEETH QUANTITY84
NOMINAL DISTANCE BETWEEN BODY FACE AND PROTRUDING HUB END0.625 INCHES SECOND END IN
BODY STYLEPLAIN, SOLID
NOMINAL OUTSIDE DIAMETER2.6870 INCHES IN
TOOTH FORMSTANDARD
PRESSURE ANGLE14.5000 DEGREES
MATERIALSTEEL COMP 416 OVERALL
FACE NOMINAL WIDTH0.188 INCHES IN
HUB NOMINAL DIAMETER0.750 INCHES FIRST END IN
HUB NOMINAL DIAMETER0.406 INCHES SECOND END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
7377651Interchangeable
interchangeable cross-reference
interchangeable
15-1-981Interchangeable
interchangeable cross-reference
interchangeable
427100Interchangeable
interchangeable cross-reference
interchangeable
206453Interchangeable
interchangeable cross-reference
interchangeable
51981Interchangeable
interchangeable cross-reference
interchangeable
05198-0001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B21561?
B21561 is a CAPACITOR,FIXED,CERAMIC DIELECTR.
What parts can replace B21561?
There are 15 known substitutes for B21561: 7377651, 15-1-981, 427100 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B21561?
B21561 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3020-00-517-2189. 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