Wheel hubs
Configuration and lubrication are confirmed against the actual operating requirement.
Representative product photography. Final closure, cage, markings and suffix are confirmed before order.
30200 SERIES
30208
Tapered Roller Bearing
Mainland supplies the 30208 tapered roller bearing for industrial distributors, OEM purchasing teams and equipment manufacturers that require a controlled, repeatable sourcing specification. Its common metric boundary dimensions are 40 mm bore, 80 mm outside diameter and 19.75 mm width. Buyers can request suitable precision, internal clearance, closure, cage, lubrication, marking and private-label packaging options, subject to engineering review. Typical applications include Wheel hubs, Transmissions, Agricultural axles. Every quotation confirms the complete order code, material scope, inspection items, MOQ, production lead time and export packing. Final load ratings, speed limits and operating suitability must be checked against the selected internal design and actual application conditions before purchase.
BORE · d40mm
OUTSIDE · D80mm
WIDTH · B/T19.75mm
- MaterialGCr15 / SAE 52100 Chrome Steel
- PrecisionNormal tolerance class; tighter limits only by written technical agreement
- MOQFrom 100 sets per model
- Lead TimeTypically 15–25 working days
TECHNICAL DATA
30208 specification baseline
Use this table for RFQ comparison. The final order code and performance sheet are confirmed for the selected configuration.
| Model | 30208 | Series | 30200 Series |
|---|---|---|---|
| Dimensions | 40 × 80 × 19.75 mm | Standard | ISO 355 metric series; ISO 492 tolerance classes |
| Reference Mass | Released on the approved model drawing | Chamfer · r | Minimum chamfer and abutment limits released on the approved drawing |
| Basic Dynamic Load · C | C value released for the approved internal design | Basic Static Load · C0 | C0 value released for the approved internal design |
| Reference / Limiting Speed | Reference / limiting speed released after closure and grease selection | ||
| Precision | Normal tolerance class; tighter limits only by written technical agreement | ||
| Internal Clearance | Axial setting is established in the bearing arrangement; specify pairing and target endplay or preload | ||
| Sealing | Open bearing set; external sealing selected in the housing design | ||
| Material | High-carbon chromium bearing steel; final grade confirmed on quotation | ||
| Cage | Pressed steel cage | ||
| Lubrication | Oil preservation standard; application grease or oil specification confirmed with the bearing arrangement | ||
| Available Suffixes | complete set · matched pair · P6 · custom axial setting · private marking | ||
| Order Code | 30208 complete set · 30208 set + P6 · 30208 matched pair + target endplay. Confirm complete bearing set, cup/cone designation, arrangement and target axial setting | ||
| Performance Data | C/C0 load ratings, contact geometry and speed limits confirmed on the final technical sheet | ||
| Packaging | Cone-and-cup set protection, neutral packaging or private label confirmed before production | ||
| MOQ | From 100 sets per model | Lead Time | Typically 15–25 working days |
| Data Release Status | RFQ baseline — performance values require Mainland engineering approval. Do not use unreleased values for bearing-life or speed calculations. | ||
RECOMMENDED USE
Typical industrial applications
Selection must also consider load, speed, temperature, fits, lubrication, contamination and required service life.
Transmissions
Configuration and lubrication are confirmed against the actual operating requirement.
Agricultural axles
Configuration and lubrication are confirmed against the actual operating requirement.
Gear reducers
Configuration and lubrication are confirmed against the actual operating requirement.
Heavy machinery
Configuration and lubrication are confirmed against the actual operating requirement.
CONTROLLED DRAWING & DOCUMENTS
Use a professional RFQ baseline.
The downloadable datasheet identifies boundary dimensions, configuration choices, order examples and every performance field that still requires Mainland engineering release.
Document status: RFQ baseline. Final C, C0, speed, mass, chamfer and clearance values require an approved Mainland drawing or technical sheet.
Download vector drawing ↓PROCUREMENT FAQ
Common questions before quotation
Can I order 30208 with OEM marking?
Yes. Marking, packaging artwork, quantity and approval samples are confirmed before production.
Which clearance and precision should I specify?
Share the fit, speed, temperature and application. We will confirm the suitable suffix and inspection limits in writing.
Can you provide samples before bulk production?
Sample availability, cost and lead time depend on the final configuration and quantity.
Which export terms are available?
FOB named-port quotations are supported. Other Incoterms are reviewed by destination and order size.