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K5521 — CAPACITOR,VARIABLE,AIR DIELECTRI

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

K5521: CAPACITOR,VARIABLE,AIR DIELECTRI.

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include material: STEEL OVERALL, overall_width: 1.4375 INCHES NOMINAL IN, outside_diameter: 5.1181 INCHES NOMINAL IN, style_designator: NORMAL ANGLE, backface_corner_radius: 0.1250 INCHES NOMINAL IN, standard_tolerance_designation: AFBMA CLASS 2. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-0496, 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
K5521
NSN: 3110-00-100-0496
NIINs: 001000496, 011221575
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: F0272 — SKF FRANCE (FRA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_width1.4375 INCHES NOMINAL IN
outside_diameter5.1181 INCHES NOMINAL IN
style_designatorNORMAL ANGLE
backface_corner_radius0.1250 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-0496
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: K5521 · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
STYLE DESIGNATOR: NORMAL ANGLE
•
OUTSIDE DIAMETER: 5.1181 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
MATERIAL: STEEL OVERALL
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
STYLE DESIGNATORNORMAL ANGLE
OVERALL WIDTH1.4375 INCHES NOMINAL IN
OUTSIDE DIAMETER5.1181 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 7
166D2Reference document
Same NSN cross-reference
Reference document — Secondary reference
5521Reference document
Same NSN cross-reference
Reference document — Secondary reference
140645Reference document
Same NSN cross-reference
Reference document — Secondary reference
5221Reference document
Same NSN cross-reference
Reference document — Secondary reference
534757Reference document
Same NSN cross-reference
Reference document — Secondary reference
2B5060Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K5521?
K5521 is a CAPACITOR,VARIABLE,AIR DIELECTRI.
What parts can replace K5521?
There are 7 known substitutes for K5521: 166D2, 5521, 140645 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for K5521?
K5521 is cataloged in the U.S. Government catalog under NSN 3110-00-100-0496. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.