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Technical Data Sheet
PartsTable / COMPONENT / 21303-4
21303-4 ✓ Verified by PartsTable
Hama · 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 CUP,TAPERED ROLLER BEARING is a Hama tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include material: ALUMINUM ALLOY, surface_treatment: ANODIZE, valve_type_for_which_designed: DIRECTIONAL CONTROL LINEAR, material_document_and_classification: QQ-A-225/8 FED SPEC SINGLE MATERIAL RESPONSE, surface_treatment_document_and_classification: MIL-A-8625, TYPE 1, CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0532, 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
21303-4
NSN: 3110-00-100-0532
FSC: 3110
CAGE: 93568 — HARSCO CORP BMY-COMBAT SYSTEMS DIV (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
surface_treatmentANODIZE
valve_type_for_which_designedDIRECTIONAL CONTROL LINEAR
material_document_and_classificationQQ-A-225/8 FED SPEC SINGLE MATERIAL RESPONSE
surface_treatment_document_and_classificationMIL-A-8625, TYPE 1, CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE
NSN3110-00-100-0532
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 21303-4 · Hama ⚠ 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
•
MATERIAL: STEEL OVERALL
•
BACKFACE CORNER RADIUS: 0.0625 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 2.8750 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
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)
OVERALL WIDTH0.5000 INCHES NOMINAL IN
STYLE DESIGNATORNORMAL ANGLE
MATERIALSTEEL OVERALL
BACKFACE CORNER RADIUS0.0625 INCHES NOMINAL IN
OUTSIDE DIAMETER2.8750 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
14979Interchangeable
interchangeable cross-reference
interchangeable
99114979Interchangeable
interchangeable cross-reference
interchangeable
101458Interchangeable
interchangeable cross-reference
interchangeable
8369BInterchangeable
interchangeable cross-reference
interchangeable
00170-0071Interchangeable
interchangeable cross-reference
interchangeable
18520Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21303-4?
21303-4 is a CUP,TAPERED ROLLER BEARING manufactured by Hama.
What parts can replace 21303-4?
There are 18 known substitutes for 21303-4: 14979, 99114979, 101458 and 15 more. Substitute compatibility should be verified for your specific system.
Is 21303-4 still available?
21303-4 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026