Automotive aftermarket and transmission sourcing starts with the approved component designation and assembly drawing. Mainland's metric 30200 catalog provides cup-and-cone sets for comparison and RFQ preparation. These are individual bearings, not complete wheel-hub units or a vehicle fitment catalog. Supply the equipment reference and both component markings before requesting an alternative.
Identify the cone and cup together, including all suffixes. Confirm assembled width T, inner-ring width B, outer-ring width C and the mounting interfaces against an approved drawing. Matching bore and outside diameter alone is insufficient.
Single-row tapered roller bearings are commonly used in opposing arrangements. The assembly establishes endplay or preload. Include the setting procedure and operating conditions rather than requesting a radial clearance suffix used for ball bearings.
Vehicle position, duty, lubrication and installation requirements must be checked by the responsible engineer. Supply drawings and acceptance requirements for review; no general catalog entry establishes approval for a safety-critical vehicle application.
These are reference models, not approved selections for a specific machine. Final suitability, suffix and performance data require technical confirmation.
| Model | Bearing type | Bore d (mm) | Outside D (mm) | Width B/T (mm) | Details |
|---|---|---|---|---|---|
| 30204 | Tapered Roller Bearing | 20 | 47 | 15.25 | View specifications → |
| 30205 | Tapered Roller Bearing | 25 | 52 | 16.25 | View specifications → |
| 30206 | Tapered Roller Bearing | 30 | 62 | 17.25 | View specifications → |
| 30208 | Tapered Roller Bearing | 40 | 80 | 19.75 | View specifications → |
No. It is a tapered roller bearing designation. A complete hub may include other bearings, seals, sensors, flanges and application-specific components.
Do not assume components from different sets or manufacturers are compatible. Identify both components and follow the equipment manufacturer's replacement and setting instructions.
Further technical reading: NTN tapered roller bearing technical guidance. Third-party guidance explains selection principles; it does not establish Mainland product ratings or endorsements.