Tapered roller bearings are a type of rolling element bearing that uses tapered rollers between an inner and outer race. These roller bearings provide rolling frictionless motion while supporting axial and radial loads. You can find tapered roller bearings in a wide range of standard sizes to suit different applications and loading requirements. We at NSAR Bearings can help you with getting them in the size you want. But before that, let’s explore the different sizes of tapered roller bearings available.

Standard Tapered Roller Bearing Sizes

Tapered roller bearings follow several standard sizing systems for the inner diameter, outer diameter and width dimensions. Common sizing standards include the Metric series, the Inch series, the JIS series used primarily in Japan, and specialty standards for certain industries.

Metric Tapered Roller Bearing Series

The Metric series of tapered roller bearings provides a standard set of size increments for the inner ring cone diameter, outer ring cup diameter, and bearing width. Common standard sizes in the metric series include:
Inner Diameters: Range from 10 mm up to 200 mm in standard increments
Outer Diameters: Range from 26 mm up to 260 mm in standard increments
Widths: Standard increments range from 7 mm up to 50 mm
So, a typical metric tapered roller bearing size could be a 30206, indicating a 30 mm inner ring ID, a 62 mm outer ring OD, and a 16 mm width. The metric series dimensions allow bearings to be easily interchanged and matched to housings across a range of common machinery.
At NSAR Bearings, we provide all these standard sizes of tapered roller bearings. We also accept OEM customization and brand customization.

Inch Tapered Roller Bearing Series

Similarly, the Inch series provides standard inner ring, outer ring, and width dimensions measured in inches rather than millimeters. Standard increment size ranges in the Inch series include:
Inner ring IDs: 0.1245 in. up to 7 in.
Outer ring ODs: 0.4000 in. up to 8.8742 in.
Widths: 0.1651 in. up to 2.25 in.
A typical inch size is the 25580 roller bearing, with 2.5563 in. inner ring ID, 5.5716 in. outer ring OD, and 0.7875 in. width. The inch series Bearing tolerances are defined in the ABMA standard for inch roller bearings.

Tapered Roller Bearing Types

Within the metric and inch bearing series, there are different types designated by letters indicating sealing, precision grade, contact angle and other properties. Common types include:
HM, JM, M: moderate precision metric class
L: long life inch class
E: extended inner ring inch version So a HM212049 is a metric, moderately precise tapered roller bearing with a 120 mm bore, 240 mm OD, and 49 mm width.
While there are too many size variants to list them all, the main Metric and Inch series with standard size increments cover a huge range of applications. Special sizes or custom bearings are also produced for unique fit and loading needs upon application request when quantities warrant.
So, whether an off-the-shelf or custom bearing is needed, there is a wide range of tapered roller bearing sizes available to suit any machinery fit and load capacity requirement through standardized dimensions. Engineers can easily look up specifications, tolerances and fits during the design process to optimize machine performance.
We at NSAR Bearings offer most standard industry sizes of tapered roller bearings. If you need custom sizes, we are capable of accommodating those requests as well. Feel free to get in touch with us to learn more about our tapered roller bearings and place your order today.