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Technical Data Sheet
31228 ✓ 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

CAPACITOR,FIXED,PAPER DIELECTRIC. Key specifications include guide: NOT INCLUDED, diameter: 0.438 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING OVERALL, body_style: W/MTG BRACKET, TERMINAL(S) ON ONE END, flute_type: INTEGRAL, seal_width: 0.417 INCHES MINIMUM AND 0.449 INCHES MAXIMUM 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 5330-00-438-5100, 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 31228
NSN: 5330-00-438-5100
FSC: 5330
CAGE: 80201 — SKF USA INC. DBA SKF AEROSPACE SEALING SOLUTIONS (USA)
SPECIFICATIONS
guideNOT INCLUDED
diameter0.438 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING OVERALL
body_styleW/MTG BRACKET, TERMINAL(S) ON ONE END
flute_typeINTEGRAL
seal_width0.417 INCHES MINIMUM AND 0.449 INCHES MAXIMUM IN
shank_typeMORSE TAPER
body_length1.531 INCHES NOMINAL IN
design_formDOUBLE-ENDED
reamer_typeFLUTED CHUCKING
constructionSOLID
flute_designSPIRAL
NSN5330-00-438-5100
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 31228 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
SURFACE TREATMENT: PLASTIC CASE
HOUSING BORE DIAMETER: 4.248 INCHES MINIMUM AND 4.250 INCHES MAXIMUM IN
MATERIAL: RUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER: 3.125 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLE: SINGLE LIP
CONSTRUCTION: SOLID
OUTSIDE DIAMETER: 4.254 INCHES NOMINAL 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)
SURFACE TREATMENTPLASTIC CASE
HOUSING BORE DIAMETER4.248 INCHES MINIMUM AND 4.250 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER3.125 INCHES NOMINAL IN
MATERIALSTEEL SPRING
CROSS-SECTIONAL SHAPE STYLESINGLE LIP
CONSTRUCTIONSOLID
OUTSIDE DIAMETER4.254 INCHES NOMINAL IN
SEAL WIDTH0.417 INCHES MINIMUM AND 0.449 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
4537-7/16Interchangeable
interchangeable cross-reference
interchangeable
232R-437Interchangeable
interchangeable cross-reference
interchangeable
50-10146 4537-7/16Interchangeable
interchangeable cross-reference
interchangeable
312-28Interchangeable
interchangeable cross-reference
interchangeable
1907139Interchangeable
interchangeable cross-reference
interchangeable
312A151Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31228?
31228 is a CAPACITOR,FIXED,PAPER DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 31228?
There are 10 known substitutes for 31228: 4537-7/16, 232R-437, 50-10146 4537-7/16 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31228?
31228 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-438-5100. This indicates validated use in U.S. government and defense supply chains.
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