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Technical Data Sheet
PartsTable / MRO / 257557F4
257557F4 ✓ 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

The CAPACITOR,FIXED,ELECTROLYTIC is a the manufacturer cache protection component designed to preserve data integrity during power loss events in enterprise server and storage controller environments. Key specifications include shaft_type: ROUND SINGLE ACTUATOR, shaft_length: 1.625 INCHES NOMINAL SINGLE ACTUATOR IN, overall_width: 1.250 INCHES NOMINAL IN, pole_quantity: 2 SECOND SECTION REAR, terminal_type: TAB, SOLDER LUG, thread_length: 0.375 INCHES NOMINAL SINGLE MOUNTING FACILITY IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-238-0180, 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→ 257557F4
NSN: 5930-00-238-0180
FSC: 5930
CAGE: 76854 — ELECTRO SWITCH CORP. DBA OAK GRISGSBY DIV ELECTROSWITCH (USA)
SPECIFICATIONS
shaft_typeROUND SINGLE ACTUATOR
shaft_length1.625 INCHES NOMINAL SINGLE ACTUATOR IN
overall_width1.250 INCHES NOMINAL IN
pole_quantity2 SECOND SECTION REAR
terminal_typeTAB, SOLDER LUG
thread_length0.375 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
overall_height1.312 INCHES NOMINAL IN
overall_length4.466 INCHES NOMINAL IN
throw_quantity5 SECOND SECTION REAR
mounting_methodTHREADED BUSHING SINGLE MOUNTING FACILITY
style_designatorCIRCULAR WAFER, BUSHING MOUNT
nominal_thread_size0.375 INCHES SINGLE MOUNTING FACILITY IN
NSN5930-00-238-0180
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAPACITOR,FIXED,ELECTROLYTIC TITLE COMPONENT PN 257557F4 MFR CAPACITOR,FIXED,ELECTR
KEY FEATURES
•
CONTACT SWITCHING ACTION: MAKES BEFORE BREAKS FOURTH SECTION REAR
•
SWITCH ACTUATOR STOP DEVICE TYPE: FIXED STOP SINGLE ACTUATOR
•
CONTACT LOAD CURRENT RATING: 2.0 AMPERES RESISTIVE LOAD DC AT SEA LEVEL
•
THREAD SERIES DESIGNATOR: UNEF SINGLE MOUNTING FACILITY
•
STYLE DESIGNATOR: CIRCULAR WAFER, BUSHING MOUNT
•
SWITCH ACTUATOR POSITIONING INCREMENT: 30.0 DEGREES SINGLE ACTUATOR
•
CONTACT VOLTAGE RATING IN VOLTS: 110.0 AC AT SEA LEVEL
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)
CONTACT SWITCHING ACTIONMAKES BEFORE BREAKS FOURTH SECTION REAR
SWITCH ACTUATOR STOP DEVICE TYPEFIXED STOP SINGLE ACTUATOR
CONTACT LOAD CURRENT RATING2.0 AMPERES RESISTIVE LOAD DC AT SEA LEVEL
THREAD SERIES DESIGNATORUNEF SINGLE MOUNTING FACILITY
CONTACT LOAD CURRENT RATING1.0 AMPERES RESISTIVE LOAD AC AT SEA LEVEL
STYLE DESIGNATORCIRCULAR WAFER, BUSHING MOUNT
SWITCH ACTUATOR POSITIONING INCREMENT30.0 DEGREES SINGLE ACTUATOR
CONTACT VOLTAGE RATING IN VOLTS110.0 AC AT SEA LEVEL
CONTACT SWITCHING ACTIONMAKES BEFORE BREAKS THIRD SECTION REAR
SHAFT LENGTH1.625 INCHES NOMINAL SINGLE ACTUATOR IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
39D107F150FP4Interchangeable
interchangeable cross-reference
interchangeable
1175-6Interchangeable
interchangeable cross-reference
interchangeable
56-812Interchangeable
interchangeable cross-reference
interchangeable
B107.400Interchangeable
interchangeable cross-reference
interchangeable
3277192Interchangeable
interchangeable cross-reference
interchangeable
7613Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 257557F4?
257557F4 is a CAPACITOR,FIXED,ELECTROLYTIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 257557F4?
There are 14 known substitutes for 257557F4: 39D107F150FP4, 1175-6, 56-812 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 257557F4?
257557F4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-00-238-0180. 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