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R91 ✓ 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,VARIABLE,AIR DIELECTRI. Key specifications include end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, bore_diameter: 0.562 INCHES NOMINAL IN, style_designator: CYLINDRICAL, spring_free_length: 5.000 INCHES NOMINAL IN, spring_solid_length: 2.375 INCHES NOMINAL IN, coil_helix_direction: RIGHT-HAND OR LEFT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4320-00-062-9585, 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
R91
NSN: 4320-00-062-9585
FSC: 4320
CAGE: 63857 — CIRCOR NAVAL SOLUTIONS LLC DBA WARREN PUMPS (USA)
SPECIFICATIONS
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
bore_diameter0.562 INCHES NOMINAL IN
special_featuresMETAL CASE,SPDT CONTACT ARRANGEMENT,120 VAC,50/60 HZ,BREAKDOWN VOLTAGE 500 VOLTS INPUT TO OUTPUT,5.187 IN. LG,1.875 IN. W,1.875 IN. H,PLUG-IN MTD VAC
style_designatorCYLINDRICAL
spring_free_length5.000 INCHES NOMINAL IN
spring_solid_length2.375 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND OR LEFT-HAND
spring_deflection_rate6.500 POUNDS PER INCH NOMINAL LBS
accommodated_rod_diameter0.250 INCHES NOMINAL IN
pump_design_control_activity63857
NSN4320-00-062-9585
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,VARIABLE,AIR DIELECTRI TITLE COMPONENT PN R91 MFR CAPACITOR,VARIABLE,AIR
KEY FEATURES
•
PUMP DESIGN CONTROL ACTIVITY: 63857
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)
PUMP DESIGN CONTROL ACTIVITY63857
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
R91Interchangeable
interchangeable cross-reference
interchangeable
15427Interchangeable
interchangeable cross-reference
interchangeable
11577Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R91?
R91 is a CAPACITOR,VARIABLE,AIR DIELECTRI.
What parts can replace R91?
There are 3 known substitutes for R91: R91, 15427, 11577. Substitute compatibility should be verified for your specific system.
What is the NSN for R91?
R91 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4320-00-062-9585. 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