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Technical Data Sheet
PartsTable / COMPONENT / C179
C179 ✓ 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,MICA DIELECTR. Key specifications include material: COPPER ALLOY, body_style: EXTERNAL LOCKING FLANGE, corner_shape: SQUARE OUTSIDE RIGHT CORNER, groove_depth: 0.156 INCHES NOMINAL IN, groove_width: 0.125 INCHES NOMINAL IN, corner_radius: 0.375 INCHES NOMINAL INSIDE RIGHT CORNER IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-424-6940, 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
C179
NSN: 3120-00-424-6940
FSC: 3120
CAGE: 71366 — BUNTING BEARINGS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY
body_styleEXTERNAL LOCKING FLANGE
corner_shapeSQUARE OUTSIDE RIGHT CORNER
groove_depth0.156 INCHES NOMINAL IN
groove_width0.125 INCHES NOMINAL IN
corner_radius0.375 INCHES NOMINAL INSIDE RIGHT CORNER IN
overall_length1.250 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES ALL SURFACES
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter7.360 INCHES MINIMUM AND 7.362 INCHES MAXIMUM IN
body_outside_diameter8.124 INCHES MINIMUM AND 8.125 INCHES MAXIMUM IN
internal_flange_width0.531 INCHES NOMINAL IN
NSN3120-00-424-6940
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: C179 · 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
•
BODY OUTSIDE DIAMETER: 0.8770 INCHES MINIMUM AND 0.8780 INCHES MAXIMUM IN
•
CORNER SHAPE: SQUARE ALL CORNERS
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.7490 INCHES MINIMUM AND 0.7510 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY 932 OVERALL
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
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)
BODY OUTSIDE DIAMETER0.8770 INCHES MINIMUM AND 0.8780 INCHES MAXIMUM IN
CORNER SHAPESQUARE ALL CORNERS
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH1.4950 INCHES MINIMUM AND 1.5050 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.7490 INCHES MINIMUM AND 0.7510 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY 932 OVERALL
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
55-22159-18AUSInterchangeable
interchangeable cross-reference
interchangeable
H3299831Interchangeable
interchangeable cross-reference
interchangeable
R529PC78Interchangeable
interchangeable cross-reference
interchangeable
WC1214-12Interchangeable
Same NIIN cross-reference
interchangeable
SH165Interchangeable
Same NIIN cross-reference
interchangeable
A101GPInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C179?
C179 is a CAPACITOR,VARIABLE,MICA DIELECTR.
What parts can replace C179?
There are 12 known substitutes for C179: 55-22159-18AUS, H3299831, R529PC78 and 9 more. Substitute compatibility should be verified for your specific system.
Is C179 still available?
C179 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