Model datasheet
30308 Tapered Roller Bearing 40x90x25.25mm
Confirm the model number, dimensions, suffix, and replacement notes before sending a quotation request for repair or MRO sourcing.
Verified directory reference: Specifications have been reviewed, but the complete suffix and current order requirement must still be confirmed before purchase.
30308 bearing specifications
| Parameter | Value |
|---|---|
| Model | 30308 |
| Category | Tapered Roller Bearing |
| Series | 30300 Series |
| Inner Diameter (ID) | 40 mm |
| Outer Diameter (OD) | 90 mm |
| Width | 25.25 mm |
| Material | Chrome Steel GCr15 |
| Closure | Open |
| Dynamic Load | 70.0 kN |
| Static Load | 80.0 kN |
| Speed Limit | 6100 RPM |
| Precision | P0 (ABEC-1) |
| Clearance | CN (Standard) |
30308 brand designation references
Interchange Numbers: 30308
Catalogue designations reviewed for this model include SKF 30308, FAG 30308A, NSK HR30308J, NTN ET-30308, Timken 30308.
These catalogue references have source records, but the complete suffix and operating requirement must still be confirmed.
| Brand | Brand designation | Reference status |
|---|---|---|
| SKF | 30308 | Source recorded SKF rolling bearing catalogue — 30308 · |
| FAG | 30308A | Source recorded Schaeffler FAG rolling bearing catalogue — 30308A · |
| NSK | HR30308J | Source recorded NSK rolling bearing catalogue — HR30308J · |
| NTN | ET-30308 | Source recorded NTN rolling bearing catalogue — ET-30308 · |
| Timken | 30308 | Source recorded Timken bearing catalogue — 30308 · |
Frequently asked questions about 30308
What does the open design mean on a 30308 bearing?
The 30308 (40mm x 90mm x 25.25mm) is supplied open — without seals or shields — so lubrication and relubrication come from the surrounding housing or an external system. Compare seal types before deciding on the replacement.
Which part numbers are equivalent to 30308?
Equivalent designations include 30308A, HR30308J, ET-30308 . These are brand-specific numbers for the same ISO boundary dimensions as the 30308 (40mm x 90mm x 25.25mm). The basic number matching does not confirm the complete specification — compare seal type, clearance, precision, cage, and lubrication suffix before ordering.
Does the 30308 come with C3 clearance?
This directory lists the 30308 with CN (Standard). C3 (increased internal clearance) versions are common for higher operating temperatures, higher speeds, or press-fit arrangements — specify the required clearance on your RFQ so the quotation matches the application. Read the clearance guide.
The 30308 is listed as a 40×90×25.25mm tapered roller bearing in open configuration. Part of the 30300 series, the directory records chrome steel gcr15 and P0 (ABEC-1) precision grade for RFQ verification.
The 30308 bearing cross-references to FAG 30308A, NSK HR30308J and NTN ET-30308. This means you can replace an SKF equivalent, FAG alternative, NSK cross reference, or NTN interchange part with the same ISO boundary dimensions. Compare the full specification table and designation suffixes before ordering, especially the seal type (2RS vs ZZ) and internal clearance (C3 vs CN).
About the 30300 Series
The 30300 series tapered roller bearings feature a steeper contact angle than the 30200 series, providing higher axial load capacity. Ideal for applications where thrust loads dominate, such as bevel gear sets and vertical shaft arrangements.
Common Applications
- Automotive
- Wheel Hubs
- Gearboxes
- Axles
- Heavy Equipment
Common applications for 30308
The 30308 is a common replacement candidate in the following equipment. Open the application guide to confirm the checks that apply to your machine before ordering:
Compare 30308 with nearby sizes
These models are the closest sizes in the same bearing family. They are not interchangeable — confirm the bore, outside diameter, and width before replacing the existing part.
| Model | Dimensions | Closure | Action |
|---|---|---|---|
| 30307 | 35mm x 80mm x 22.75mm | Open | View specifications |
| 32207 | 35mm x 72mm x 24.25mm | Open | View specifications |
| 30208 | 40mm x 80mm x 19.75mm | Open | View specifications |
| 32208 | 40mm x 80mm x 24.75mm | Open | View specifications |
| 30209 | 45mm x 85mm x 20.75mm | Open | View specifications |
Fast bearing RFQ
Tell us what bearing you need.
A model number is enough to start. If the marking is unclear, send the dimensions, application, or a shared photo link in the message.
- Small repair quantities and mixed model lists
- Model, suffix, and replacement review
- Price, lead time, packing, and shipping details