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40398-4 FN 29 — Technical Data Sheet

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— · 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,CERAMIC DIELE. Key specifications include test_type: ROCKWELL, body_style: COMPRESSION, body_width: 0.200 INCHES NOMINAL IN, body_height: 0.060 INCHES MAXIMUM IN, body_length: 0.200 INCHES NOMINAL IN, usage_design: EXTERNAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 3120-01-443-1834, 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
40398-4 FN 29
NSN: 3120-01-443-1834
FSC: 3120
CAGE: 55378 — TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC (USA)
SPECIFICATIONS
test_typeROCKWELL
body_styleCOMPRESSION
body_width0.200 INCHES NOMINAL IN
body_height0.060 INCHES MAXIMUM IN
body_length0.200 INCHES NOMINAL IN
usage_designEXTERNAL
carrying_casePROVIDED
inclosure_typeENCAPSULATED
indicator_typeCIRCULAR DIAL
control_locationCENTER
horizontal_reach3.300 INCHES IN
indicator_designDIRECT READING
NSN3120-01-443-1834
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 40398-4 FN 29 · 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
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
9410+0InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
917-0005-010InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
9410-0PCInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
94176InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M-51InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
2387091-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40398-4 FN 29?
40398-4 FN 29 is a CAPACITOR,VARIABLE,CERAMIC DIELE.
What parts can replace 40398-4 FN 29?
There are 9 known substitutes for 40398-4 FN 29: 9410+0, 917-0005-010, 9410-0PC and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40398-4 FN 29?
40398-4 FN 29 is cataloged in the Federal Logistics Information System under NSN 3120-01-443-1834. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: October 2026