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R4688 — CAPACITOR,VARIABLE,AIR DIELECTRI

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

R4688: CAPACITOR,VARIABLE,AIR DIELECTRI.

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include bore_diameter: 1.1250 INCHES NOMINAL IN, overall_width: 1.0000 INCHES NOMINAL IN, alignment_type: RIGID, style_designator: NON-SEPARABLE, OPEN END, DRAWN SHELL, operating_frequency: 12.5 GIGAHERTZ MINIMUM AND 91.0 GIGAHERTZ MAXIMUM LOCATION NOT OTHERWISE SPECIFIED, transmission_line_type: COAXIAL CABLE. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-120-3106, 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
R4688
NSN: 3110-00-120-3106
NIINs: 001203106, 013789319
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 35311 — AMERICAN STANDARD INC WESTINGHOUSE AIR BRAKE CO DIV (USA)
SPECIFICATIONS
bore_diameter1.1250 INCHES NOMINAL IN
overall_width1.0000 INCHES NOMINAL IN
alignment_typeRIGID
style_designatorNON-SEPARABLE, OPEN END, DRAWN SHELL
operating_frequency12.5 GIGAHERTZ MINIMUM AND 91.0 GIGAHERTZ MAXIMUM LOCATION NOT OTHERWISE SPECIFIED
transmission_line_typeCOAXIAL CABLE
end_item_identificationF-14 ACFT
overall_outside_diameter1.3750 INCHES NOMINAL IN
standard_tolerance_designationAFBMA STD TOLERANCE FOR INDUSTRIAL NEEDLE BEARINGS
NSN3110-00-120-3106
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: R4688 · 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: NON-SEPARABLE, OPEN END, DRAWN SHELL
•
OVERALL OUTSIDE DIAMETER: 1.3750 INCHES NOMINAL IN
•
ALIGNMENT TYPE: RIGID
•
STANDARD TOLERANCE DESIGNATION: AFBMA STD TOLERANCE FOR INDUSTRIAL NEEDLE BEARINGS
•
BORE DIAMETER: 1.1250 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
STYLE DESIGNATORNON-SEPARABLE, OPEN END, DRAWN SHELL
OVERALL WIDTH1.0000 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER1.3750 INCHES NOMINAL IN
ALIGNMENT TYPERIGID
STANDARD TOLERANCE DESIGNATIONAFBMA STD TOLERANCE FOR INDUSTRIAL NEEDLE BEARINGS
BORE DIAMETER1.1250 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 7
160921Reference document
Same NSN cross-reference
Reference document — Secondary reference
160934Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
709432Reference document
Same NSN cross-reference
Reference document — Secondary reference
H160921Reference document
Same NSN cross-reference
Reference document — Secondary reference
B1816XReference document
Same NSN cross-reference
Reference document — Secondary reference
3236328Reference 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 R4688?
R4688 is a CAPACITOR,VARIABLE,AIR DIELECTRI.
What parts can replace R4688?
There are 7 known substitutes for R4688: 160921, 160934, 709432 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R4688?
R4688 is cataloged in the U.S. Government catalog under NSN 3110-00-120-3106. 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.