PartsTable
Technical Data Sheet
PartsTable / MRO / 520-55
520-55 ✓ Verified by PartsTable
Lindy · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
CTO = bare chassis: no CPU, no RAM, no disks — configure everything SFF chassis = 2.5" bays | LFF chassis = 3.5" bays
Rail kit included? Usually sold separately.
PRODUCT OVERVIEW

The CUP,TAPERED ROLLER BEARING is a Lindy tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include disk_type: MAGNETIC, disk_diameter: 5.250 INCHES NOMINAL IN, disk_quantity: 10, tracks_per_inch: 40, special_features: PREFORMATTED; DOUBLE SIDED,DOUBLE DENSITY,SOFT SECTORED; 40 TRACKS,320KB; USED ON IBM PC KB, disk_density_rating: DS/DD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 7045-01-367-0387, 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
MRO→ MRO_GENERAL→ 520-55
NSN: 7045-01-367-0387
FSC: 7045
CAGE: 69302 — KAO INC (USA)
SPECIFICATIONS
disk_typeMAGNETIC
disk_diameter5.250 INCHES NOMINAL IN
disk_quantity10
tracks_per_inch40
special_featuresPREFORMATTED; DOUBLE SIDED,DOUBLE DENSITY,SOFT SECTORED; 40 TRACKS,320KB; USED ON IBM PC KB
disk_density_ratingDS/DD
NSN7045-01-367-0387
COMPONENT DIAGRAM
LINDY BAY 0 BAY 1 BAY 2 BAY 3 BAY 4 BAY 5 BAY 6 BAY 7 FAN PSU 1 800W PSU 2 800W iLO / BMC | 4x1GbE | VGA | USB | PCIe RISERS 19" RACK WIDTH | 2U HEIGHT (88mm) Lindy 2U RACK SERVER | Gen10 | 8x SFF BAYS | REDUNDANT PSU CTO = bare chassis (no CPU/RAM/disk) | SFF = 2.5" bays | LFF = 3.5" bays TITLE 2U SERVER PN 520-55 MFR Lindy Gen10 RACK SERVER
KEY FEATURES
•
TRACKS PER INCH: 40
•
DISK QUANTITY: 10
•
DISK DIAMETER: 5.250 INCHES NOMINAL IN
•
DISK DENSITY RATING: DS/DD
•
DISK TYPE: MAGNETIC
TYPICAL APPLICATIONS
  • Long-term data archival and compliance retention
  • Offsite backup and disaster recovery
  • Air-gapped ransomware protection
  • Cold storage tier for infrequently accessed data
TECHNICAL CHARACTERISTICS (FLIS)
TRACKS PER INCH40
DISK QUANTITY10
DISK DIAMETER5.250 INCHES NOMINAL IN
SPECIAL FEATURESPREFORMATTED; DOUBLE SIDED,DOUBLE DENSITY,SOFT SECTORED; 40 TRACKS,320KB; USED ON IBM PC KB
DISK DENSITY RATINGDS/DD
DISK TYPEMAGNETIC
TRACKS PER INCH40
DISK QUANTITY10
DISK DIAMETER5.250 INCHES NOMINAL IN
SPECIAL FEATURESPREFORMATTED; DOUBLE SIDED,DOUBLE DENSITY,SOFT SECTORED; 40 TRACKS,320KB; USED ON IBM PC KB
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
18-189Interchangeable
interchangeable cross-reference
interchangeable
72341Interchangeable
interchangeable cross-reference
interchangeable
WRR400-3S172SInterchangeable
interchangeable cross-reference
interchangeable
810350Interchangeable
interchangeable cross-reference
interchangeable
125-97Interchangeable
interchangeable cross-reference
interchangeable
1B3948Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 520-55?
520-55 is a CUP,TAPERED ROLLER BEARING manufactured by Lindy. It is classified as a MRO (MRO_GENERAL).
What parts can replace 520-55?
There are 16 known substitutes for 520-55: 18-189, 72341, WRR400-3S172S and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 520-55?
520-55 is cataloged in the Federal Logistics Information System (FLIS) under NSN 7045-01-367-0387. 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: July 2026