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Technical Data Sheet
PartsTable / COMPONENT / B28-20-5-5-8
B28-20-5-5-8 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

CAPACITOR,VARIABLE,GLASS DIELECT. Key specifications include material: COPPER ALLOY OVERALL, corner_shape: SQUARE ALL CORNERS, hole_diameter: 0.1250 INCHES NOMINAL FIRST IN, overall_length: 5.6250 INCHES NOMINAL IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 3.0020 INCHES MINIMUM AND 3.0050 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-427-1774, 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
B28-20-5-5-8
NSN: 3120-00-427-1774
FSC: 3120
CAGE: 51501 — ROGERS BROTHERS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
corner_shapeSQUARE ALL CORNERS
hole_diameter0.1250 INCHES NOMINAL FIRST IN
overall_length5.6250 INCHES NOMINAL IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter3.0020 INCHES MINIMUM AND 3.0050 INCHES MAXIMUM IN
body_outside_diameter3.3750 INCHES MINIMUM AND 3.3800 INCHES MAXIMUM IN
lubricant_accommodation_styleGROOVED CIRCULAR
surface_groove_location_and_quantity1 INTERNAL
antirotation/lubrication_type_and_quantity4 HOLE
NSN3120-00-427-1774
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: B28-20-5-5-8 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
ANTIROTATION/LUBRICATION TYPE AND QUANTITY: 4 HOLE
•
MATERIAL: COPPER ALLOY OVERALL
•
BODY INSIDE DIAMETER: 3.0020 INCHES MINIMUM AND 3.0050 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 3.3750 INCHES MINIMUM AND 3.3800 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.1250 INCHES NOMINAL FIRST IN
•
CORNER SHAPE: SQUARE ALL CORNERS
•
SURFACE GROOVE LOCATION AND QUANTITY: 1 INTERNAL
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)
ANTIROTATION/LUBRICATION TYPE AND QUANTITY4 HOLE
MATERIALCOPPER ALLOY OVERALL
BODY INSIDE DIAMETER3.0020 INCHES MINIMUM AND 3.0050 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER3.3750 INCHES MINIMUM AND 3.3800 INCHES MAXIMUM IN
HOLE DIAMETER0.1250 INCHES NOMINAL FIRST IN
CORNER SHAPESQUARE ALL CORNERS
OVERALL LENGTH5.6250 INCHES NOMINAL IN
SURFACE GROOVE LOCATION AND QUANTITY1 INTERNAL
LUBRICANT ACCOMMODATION STYLEGROOVED CIRCULAR
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
A18761-14Interchangeable
interchangeable cross-reference
interchangeable
682241BRInterchangeable
interchangeable cross-reference
interchangeable
2C2736Interchangeable
interchangeable cross-reference
interchangeable
525-000Interchangeable
interchangeable cross-reference
interchangeable
PC51H160Interchangeable
interchangeable cross-reference
interchangeable
GHC16000Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B28-20-5-5-8?
B28-20-5-5-8 is a CAPACITOR,VARIABLE,GLASS DIELECT.
What parts can replace B28-20-5-5-8?
There are 9 known substitutes for B28-20-5-5-8: A18761-14, 682241BR, 2C2736 and 6 more. Substitute compatibility should be verified for your specific system.
Is B28-20-5-5-8 still available?
B28-20-5-5-8 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