PartsTable
Technical Data Sheet
PartsTable / MRO / 031-640
031-640 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
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 material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, body_style: W/O MTG FACILITIES, TERMINAL(S) ON ONE END, body_length: 4.125 INCHES NOMINAL IN, temp_rating: -65.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF, body_diameter: 1.375 INCHES NOMINAL IN, outside_diameter: 0.879 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-248-3848, 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→ 031-640
NSN: 5331-00-248-3848
FSC: 5331 — O-RING
CAGE: 34228 — L3 TECHNOLOGIES, INC. DIV L3 KEO (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
body_styleW/O MTG FACILITIES, TERMINAL(S) ON ONE END
body_length4.125 INCHES NOMINAL IN
temp_rating-65.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
body_diameter1.375 INCHES NOMINAL IN
outside_diameter0.879 INCHES NOMINAL IN
center_hole_diameter0.734 INCHES MINIMUM AND 0.744 INCHES MAXIMUM IN
elongation_percentage200 MAXIMUM
reliability_indicatorNOT ESTABLISHED
cross-sectional_height0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
electrical_polarizationNONPOLARIZED
case_insulation_materialPLASTIC
NSN5331-00-248-3848
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 031-640 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.879 INCHES NOMINAL IN
•
ELONGATION PERCENTAGE: 200 MAXIMUM
•
TEMP RATING: -65.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
•
CENTER HOLE DIAMETER: 0.734 INCHES MINIMUM AND 0.744 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
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)
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.879 INCHES NOMINAL IN
ELONGATION PERCENTAGE200 MAXIMUM
TEMP RATING-65.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
CENTER HOLE DIAMETER0.734 INCHES MINIMUM AND 0.744 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
3-66391Interchangeable
interchangeable cross-reference
interchangeable
00520Interchangeable
interchangeable cross-reference
interchangeable
503-S 57Interchangeable
interchangeable cross-reference
interchangeable
350-RTInterchangeable
interchangeable cross-reference
interchangeable
44127Interchangeable
interchangeable cross-reference
interchangeable
9937B406Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 031-640?
031-640 is a CAPACITOR,FIXED,ELECTROLYTIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 031-640?
There are 29 known substitutes for 031-640: 3-66391, 00520, 503-S 57 and 26 more. Substitute compatibility should be verified for your specific system.
Is 031-640 still available?
031-640 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