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4255218 — CUP,TAPERED ROLLER BEARING

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

4255218: CUP,TAPERED ROLLER BEARING.

The CUP,TAPERED ROLLER BEARING is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include material: ALUMINUM OVERALL, head_style: OVAL/TRUSS, grip_length: 0.815 INCHES NOMINAL IN, head_height: 0.050 INCHES MAXIMUM IN, shank_style: SELF-PLUGGING SHANK W/GROOVED END FOR LOCKING, shank_diameter: 0.187 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-0580, 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
4255218
NSN: 3110-00-100-0580
NIINs: 001000580, 016617316
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 89926 — NEW HOLLAND CONSTRUCTION (USA)
SPECIFICATIONS
materialALUMINUM OVERALL
head_styleOVAL/TRUSS
grip_length0.815 INCHES NOMINAL IN
head_height0.050 INCHES MAXIMUM IN
shank_styleSELF-PLUGGING SHANK W/GROOVED END FOR LOCKING
shank_diameter0.187 INCHES NOMINAL IN
special_featuresRECOMMENDED HOLE SIZE: .192 - .196 INCHES; GRIP RANGE: .501/.625 INCHES IN
head_major_diameter0.375 INCHES NOMINAL IN
end_item_identification4210-01-622-0440
part_name_assigned_by_controlling_agencyRIVET, BLD, FLT
NSN3110-00-100-0580
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 4255218 · 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: NORMAL ANGLE
•
OUTSIDE DIAMETER: 4.1250 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.0800 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
MATERIAL: STEEL OVERALL
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
STYLE DESIGNATORNORMAL ANGLE
OVERALL WIDTH0.6250 INCHES NOMINAL IN
OUTSIDE DIAMETER4.1250 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0800 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 7
K39412Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
103S22Reference document
Same NSN cross-reference
Reference document — Secondary reference
39412Reference document
Same NSN cross-reference
Reference document — Secondary reference
21076Reference document
Same NSN cross-reference
Reference document — Secondary reference
11697066Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
FF-B-187/1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4255218?
4255218 is a CUP,TAPERED ROLLER BEARING.
What parts can replace 4255218?
There are 7 known substitutes for 4255218: K39412, 103S22, 39412 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4255218?
4255218 is cataloged in the U.S. Government catalog under NSN 3110-00-100-0580. 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.