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R645 — CAPACITOR,VARIABLE,GLASS DIELECT

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

R645: CAPACITOR,VARIABLE,GLASS DIELECT.

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 U.S.

Government catalog 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
R645
NSN: 3120-00-427-1774
FSC: 3120 — Bearings, Plain, Unmounted
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: R645 · 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
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY OUTSIDE DIAMETER: 3.3750 INCHES MINIMUM AND 3.3800 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
BODY INSIDE DIAMETER: 3.0020 INCHES MINIMUM AND 3.0050 INCHES MAXIMUM IN
•
LUBRICANT ACCOMMODATION STYLE: GROOVED CIRCULAR
•
ANTIROTATION/LUBRICATION TYPE AND QUANTITY: 4 HOLE
•
MATERIAL: COPPER ALLOY 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
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER3.3750 INCHES MINIMUM AND 3.3800 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH5.6250 INCHES NOMINAL IN
BODY INSIDE DIAMETER3.0020 INCHES MINIMUM AND 3.0050 INCHES MAXIMUM IN
LUBRICANT ACCOMMODATION STYLEGROOVED CIRCULAR
ANTIROTATION/LUBRICATION TYPE AND QUANTITY4 HOLE
MATERIALCOPPER ALLOY OVERALL
SURFACE GROOVE LOCATION AND QUANTITY1 INTERNAL
HOLE DIAMETER0.1250 INCHES NOMINAL FIRST IN
SUBSTITUTES & CROSS-REFERENCES 3
B28-20-5-5-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
565013Reference document
Same NSN cross-reference
Reference document — Secondary reference
P1569Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is R645?
R645 is a CAPACITOR,VARIABLE,GLASS DIELECT.
What parts can replace R645?
There are 3 known substitutes for R645: B28-20-5-5-8, 565013, P1569. Substitute compatibility should be verified for your specific system.
What is the NSN for R645?
R645 is cataloged in the U.S. Government catalog under NSN 3120-00-427-1774. This indicates validated use in U.S. government and defense supply chains.
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