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Technical Data Sheet
PartsTable / COMPONENT / 25Z259D173
25Z259D173 ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

The BEARING,ROLLER,TAPERED is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include material: STEEL OVERALL, cup_width: 1.5000 INCHES NOMINAL IN, cone_width: 1.8900 INCHES NOMINAL IN, bore_diameter: 4.1250 INCHES NOMINAL IN, overall_width: 1.8750 INCHES NOMINAL IN, standout_width: 0.3750 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-4419, 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
25Z259D173
NSN: 3110-00-100-4419
FSC: 3110
CAGE: 27315 — MORRIS MATERIAL HANDLING, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width1.5000 INCHES NOMINAL IN
cone_width1.8900 INCHES NOMINAL IN
bore_diameter4.1250 INCHES NOMINAL IN
overall_width1.8750 INCHES NOMINAL IN
standout_width0.3750 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.1400 INCHES NOMINAL IN
backface_corner_radius0.1300 INCHES NOMINAL IN
overall_outside_diameter7.1250 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-4419
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 25Z259D173 · 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
•
MATERIAL: STEEL OVERALL
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
BACKFACE CORNER RADIUS: 0.1300 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
CUP WIDTH: 1.5000 INCHES NOMINAL IN
•
OVERALL OUTSIDE DIAMETER: 7.1250 INCHES NOMINAL IN
•
BORE DIAMETER: 4.1250 INCHES NOMINAL IN
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)
MATERIALSTEEL OVERALL
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BACKFACE CORNER RADIUS0.1300 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
CUP WIDTH1.5000 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER7.1250 INCHES NOMINAL IN
BORE DIAMETER4.1250 INCHES NOMINAL IN
OVERALL WIDTH1.8750 INCHES NOMINAL IN
CONE WIDTH1.8900 INCHES NOMINAL IN
STANDOUT WIDTH0.3750 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
469-2Interchangeable
interchangeable cross-reference
interchangeable
78-277Interchangeable
interchangeable cross-reference
interchangeable
FIG 7-2-78/4Interchangeable
interchangeable cross-reference
interchangeable
A0S1-545Interchangeable
Same NIIN cross-reference
interchangeable
772AND782Interchangeable
Same NIIN cross-reference
interchangeable
772-782Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 25Z259D173?
25Z259D173 is a BEARING,ROLLER,TAPERED.
What parts can replace 25Z259D173?
There are 7 known substitutes for 25Z259D173: 469-2, 78-277, FIG 7-2-78/4 and 4 more. Substitute compatibility should be verified for your specific system.
Is 25Z259D173 still available?
25Z259D173 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