Finding the right tapered roller bearing feels impossible when standard sizes don’t fit. You need a specific bore and OD, but searching through countless catalogs wastes your time and delays your projects. This frustration stops now.

You can find a tapered roller bearing number by matching the stamped code on the bearing itself to manufacturer catalogs, or by using online tools that let you search by your specific inner diameter (ID) and outer diameter (OD) measurements to get the exact part number you need.

We know your machinery demands precision. A generic bearing won’t do. This guide will show you how to find any bearing number by size and explain the power of custom-bored and unitized solutions. Keep reading to turn your bearing search from a headache into a simple, streamlined process.

How to find taper roller bearing number?

Your production line is halted because a critical bearing has failed. The old one is worn, and the part number is illegible. You’re facing expensive downtime while your team struggles to identify a replacement, guessing at sizes and ordering the wrong parts.

To find a tapered roller bearing number¹, first clean the bearing thoroughly. Look for a stamped alphanumeric code² on the ring’s face or side. This code is the bearing number. Cross-reference this number with the manufacturer’s catalog or use an online bearing interchange database³ to confirm the exact specifications.

A Step-by-Step Guide to Decoding Bearing Numbers

The numbers on a bearing are not random. They are a code that tells you everything about the bearing. Understanding this code is the key to finding the right replacement every single time. Most major manufacturers, like Timken, NSK, or SKF, use a similar system. The number gives you the bearing’s type, its size, and its design.

The basic number tells you the bearing type. A number starting with ‘LM’ or ‘T’ often means it is a tapered roller bearing. The numbers after the letters give you the size. The first two numbers of the size code often relate to the bore diameter. The next two numbers relate to the outside diameter and width. But the system is not always simple. Some numbers are metric. Some are in inches. This is why a catalog or database is so important.

Here is a simple table to understand a common numbering system for inch series bearings:

Code Segment	What It Means	Example: LM67048
Prefix (Letters)	Bearing series and type.	LM indicates a specific inch series tapered roller bearing.
First Number Digits	Bore diameter code. This often needs a conversion chart.	67 corresponds to a specific bore size, e.g., 2.8346 inches.
Last Number Digits	Outer diameter and width code.	048 defines the specific cup (outer ring) design and dimensions.

Sometimes, the number includes a suffix. Suffixes give extra information. For example, the suffix might tell you about the material or the precision class. A common suffix is P5, which means it is a high-precision bearing.

If the number is completely gone, you must measure. Use a digital caliper for accuracy⁴. Measure the bore (ID), the outside diameter (OD), and the total width. Write these numbers down in inches and millimeters. Then, you can use these measurements to search for the bearing number online. Our website lets you search by exact ID and OD. This makes it easy to find your bearing when the part number is missing.

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How to get bearing number by size?

You have the physical dimensions of the bearing space in your machine: a 3-inch bore and a 6-inch outer diameter. But scrolling through endless PDF catalogs with thousands of part numbers is inefficient and prone to human error, risking another incorrect order.

You can get a bearing number by size using an online bearing finder tool¹. Enter the precise Inner Diameter (ID), Outer Diameter (OD), and Width (W) measurements. The tool will then generate a list of matching standard bearing number²s or provide a custom part number for non-standard sizes.

The Practical Method for Sizing and Sourcing Bearings

Getting the size right is the most important step. A mistake of even a thousandth of an inch can make a bearing useless. First, you must remove the old bearing from the equipment. Clean it with a solvent and a brush. Remove all grease, dirt, and debris. This gives you a clean surface to measure.

Use a high-quality digital caliper³ for the best results. Make sure the battery is good. Confirm the caliper is zeroed out before you start. Measure the bore, which is the inside diameter where the shaft fits. Measure the outside diameter of the entire bearing. Finally, measure the total width of the bearing assembly. Write down each measurement. Be precise. It is good to measure in both inches and millimeters because some catalogs use metric units.

Once you have your three key numbers (ID, OD, Width), you can find your bearing. Do not try to guess the number from the size. The numbering system is not intuitive. A 3-inch bore does not become "300" in the part number. You need a reference.

Here is a basic table of actions to take based on your measurement results:

Your Situation	The Best Action	The Outcome
Measurements match a standard size	Use an online search tool on a supplier website like FYTZ.	You get a standard bearing number2 (e.g., 32308) for immediate ordering.
Measurements are close to a standard size	Contact the supplier directly. Do not force a fit.	The engineer can recommend the closest standard fit or advise on custom boring.
Measurements are completely unique	Request a custom-bearing service4.	You receive a new, custom part number (e.g., LM67048-CB100) for your exact application.

For standard sizes, online tools are fast. For anything unusual, talk to a bearing expert. At FYTZ, we help customers every day who have odd sizes. We can make a standard bearing with a custom-bored ID to fit your unique shaft size. This saves you from having to change your whole machine design. It is a cost-effective solution for special machinery or legacy equipment.

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What is a Unitised tapered roller bearing¹ capable of?

You’re designing a new conveyor system for a harsh, dusty environment. You need a bearing solution that can withstand the contamination but dread the thought of complex, time-consuming installation and the constant maintenance of separate seals and bearings.

A Unitised tapered roller bearing¹ is a complete, pre-adjusted assembly². It combines a tapered roller bearing with a permanently attached, high-performance seal. It is capable of simplifying installation, providing excellent sealing against contaminants³ like dirt and water, and maintaining preset settings for optimal performance in tough environments.

The Integrated Power of the Unitized Bearing

Think of a unitized bearing as a complete, sealed module. It is ready to work straight out of the box. A traditional bearing setup has many parts. You have the inner ring, the outer ring, the rollers, the cage, and then separate seals. The installer must set the clearance perfectly. This is a skilled job. It takes time and can be done wrong.

A unitized bearing changes everything. The manufacturer assembles the cone, cup, and rollers at the factory. They set the clearance with precision machinery. Then, they permanently attach a rubber or polymer seal to the assembly. This seal is designed to keep grease in and dirt out. The bearing is now one single unit. You press the entire assembly into your housing. The installation is much faster. You do not need to be a bearing expert to get it right.

The capabilities of this design are significant. The seal is the key. It allows the bearing to perform in places where standard open bearings would fail quickly. For example, in agricultural equipment, the bearing is exposed to mud and crop material. In mining equipment, it sees dust and rock slurry. In food processing, it must resist washdowns with water and chemicals. The unitized bearing handles all of this.

Here is a comparison of capabilities versus traditional open bearings:

Capability	Traditional Bearing	Unitized Tapered Bearing
Contamination Resistance	Poor. Requires external seals which can fail.	Excellent. Integrated seal provides robust protection.
Ease of Installation	Difficult. Requires skill to set clearance.	Simple. Pre-set, pre-sealed, just press into place.
Maintenance Needs	High. Requires frequent re-lubrication.	Low. Often comes pre-lubricated for life.
Consistency of Performance	Varies based on installer skill.	Consistently High. Factory-set for optimum function.

For our customers who are distributors, this is a great product. Your clients in tough industries will have fewer failures. This means fewer warranty claims and happier end-users. The value is not just in the product, but in the saved labor and downtime.

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What size are tapered roller bearings¹?

You’re ready to place an order, but the world of tapered roller bearing sizes is confusing. You hear terms like "inch series²," "metric series³," "ISO," and "JIS," and you’re worried that ordering the wrong standard will result in a bearing that doesn’t fit your application, causing more delays.

Tapered roller bearings are made in a vast range of sizes, broadly categorized into two systems: metric series³ (e.g., 30206) and inch series² (e.g., LM67048). Their sizes can range from a few millimeters in bore (for precision applications) to over several feet in outer diameter for heavy industrial machinery like mining equipment.

Navigating the Two Worlds of Bearing Sizes

The size of a tapered roller bearing is not one number. It is a set of dimensions. The most important ones are the bore diameter⁴ (ID), the outside diameter (OD), the width, and the angle of the rollers. These dimensions are grouped into standardized series. However, the world uses two main systems. This is the primary source of confusion.

The first system is the metric system. This is governed by ISO (International Organization for Standardization) standards. The part numbers are typically all numbers, like 30302, 32026, or 33116. The first two digits tell you the series, which relates to the angle and size profile. The last three digits relate to the bore diameter⁴. For example, a 32026 bearing has a 130 mm bore. Metric series bearings are common in European, Asian, and global machinery.

The second system is the inch system. These bearings are measured in inches. Their part numbers often have letters and numbers, like LM11949, 25580, or 26882. The numbering system is different from the metric one. An LM11949 bearing has a bore of 1.0625 inches. Inch series bearings are very common in North American-made equipment, especially in automotive, agriculture, and aerospace industries.

Here is a table breaking down the common series and their typical applications:

Series Type	Example Part Number	Typical Bore Size Range	Common Applications
Metric ISO Series	30302	15 mm – 200 mm	General industrial machinery, gearboxes, European vehicles.
Inch Series (e.g., Timken)	LM67048	0.5 in. – 20 in.	American trucks, agricultural equipment, construction machinery.
JIS Metric Series	30206	30 mm – 160 mm	Japanese and Korean industrial and automotive equipment.

You must know which system your machine uses. Trying to fit a metric bearing into an inch-designed housing will not work. The angles and dimensions are subtly different. The best way to be sure is to measure your old bearing accurately and consult with your supplier. At FYTZ, we produce bearings to both metric and inch standards. We can also manufacture custom sizes⁵ that are not in any catalog. This ensures you get the perfect fit, no matter what machine you are repairing.

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Conclusion

Finding the right tapered roller bearing is simple when you know how to measure and where to look. For exact fits, always consider custom-bored or unitized solutions for lasting performance.