Bearing Number And Size Chart

Selecting the correct bearing starts with understanding its number and dimensions. A bearing’s part number provides valuable information about its size, design, and performance characteristics, helping you choose a bearing that matches your application’s requirements.

This guide includes bearing size charts for popular bearing series, explains how bearing numbering systems work, and offers practical tips for selecting the right bearing based on load, speed, operating conditions, and available installation space.

Bearing Number And Size Chart

6000 Series Metric Bearings

Bearing Number	ID (MM)	OD (MM)	Width (MM)	ID (inch)	OD (inch)	Width (inch)
6000	10	26	8	0.394	1.024	0.315
6001	12	28	8	0.472	1.102	0.315
6002	15	32	9	0.591	1.260	0.354
6003	17	35	10	0.669	1.378	0.394
6004	20	42	12	0.787	1.654	0.472
6005	25	47	12	0.984	1.850	0.472
6006	30	55	13	1.181	2.165	0.512
6007	35	62	14	1.378	2.441	0.551
6008	40	68	15	1.575	2.677	0.591
6009	45	75	16	1.772	2.953	0.630
6010	50	80	16	1.969	3.150	0.630
6011	55	90	18	2.165	3.543	0.709
6012	60	95	18	2.362	3.740	0.709
6013	65	100	18	2.559	3.937	0.709
6014	70	110	20	2.756	4.331	0.787
6015	75	115	20	2.953	4.528	0.787
6016	80	125	22	3.150	4.921	0.866
6017	85	130	22	3.346	5.118	0.866
6018	90	140	24	3.543	5.512	0.945
6019	95	145	24	3.740	5.709	0.945
6020	100	150	24	3.937	5.906	0.945
6021	105	160	26	4.134	6.299	1.024
6022	110	170	28	4.331	6.693	1.102
6024	120	180	28	4.724	7.087	1.102
6026	130	200	33	5.118	7.874	1.299
6028	140	210	33	5.512	8.268	1.299
6030	150	225	35	5.906	8.858	1.378

6200 Series Metric Bearings

Bearing Number	ID (MM)	OD (MM)	Width (MM)	ID (inch)	OD (inch)	Width (inch)
6200	10	30	9	0.394	1.181	0.354
6201	12	32	10	0.472	1.260	0.394
6202	15	35	11	0.591	1.378	0.433
6202-10	15.875	35	11	0.625	1.378	0.433
6203	17	40	12	0.669	1.575	0.472
6204	20	47	14	0.787	1.850	0.551
6205	25	52	15	0.984	2.047	0.591
6206	30	62	16	1.181	2.441	0.630
6207	35	72	17	1.378	2.835	0.669
6208	40	80	18	1.575	3.150	0.709
6209	45	85	19	1.772	3.346	0.748
6210	50	90	20	1.969	3.543	0.787
6211	55	100	21	2.165	3.937	0.827
6212	60	110	22	2.362	4.331	0.866
6213	65	120	23	2.559	4.724	0.906
6214	70	125	24	2.756	4.921	0.945
6215	75	130	25	2.953	5.118	0.984
6216	80	140	26	3.150	5.512	1.024
6217	85	150	28	3.346	5.906	1.102
6218	90	160	30	3.543	6.299	1.181
6219	95	170	32	3.740	6.693	1.260
6220	100	180	34	3.937	7.087	1.339
6221	105	190	36	4.134	7.480	1.417
6222	110	200	38	4.331	7.874	1.496
6224	120	215	40	4.724	8.465	1.575
6226	130	230	40	5.118	9.055	1.575
6228	140	250	42	5.512	9.843	1.654
6230	150	270	45	5.906	10.630	1.772

6300 Series Metric Bearings

Bearing Number	ID (MM)	OD (MM)	Width (MM)	ID (inch)	OD (inch)	Width (inch)
6300	10	35	11	0.394	1.378	0.433
6301	12	37	12	0.472	1.457	0.472
6302	15	42	13	0.591	1.654	0.512
6303	17	47	14	0.669	1.850	0.551
6304	20	52	15	0.787	2.047	0.591
6305	25	62	17	0.984	2.441	0.669
6306	30	72	19	1.181	2.835	0.748
6307	35	80	21	1.378	3.150	0.827
6308	40	90	23	1.575	3.543	0.906
6309	45	100	25	1.772	3.937	0.984
6310	50	110	27	1.969	4.331	1.063
6311	55	120	29	2.165	4.724	1.142
6312	60	130	31	2.362	5.118	1.220
6313	65	140	33	2.559	5.512	1.299
6314	70	150	35	2.756	5.906	1.378
6315	75	160	37	2.953	6.299	1.457
6316	80	170	39	3.150	6.693	1.535
6317	85	180	41	3.346	7.087	1.614
6318	90	190	43	3.543	7.480	1.693
6319	95	200	45	3.740	7.874	1.772
6320	100	215	47	3.937	8.465	1.850
6321	105	225	49	4.134	8.858	1.929
6322	110	240	50	4.331	9.449	1.969
6324	120	260	55	4.724	10.236	2.165
6326	130	280	58	5.118	11.024	2.283
6328	140	300	62	5.512	11.811	2.441
6330	150	320	65	5.906	12.598	2.559

Miniature Size Bearings

Bearing Number	ID (MM)	OD (MM)	Width (MM)	ID (inch)	OD (inch)	Width (inch)
607	7	19	6	0.275	0.748	0.236
608	8	22	7	0.315	0.866	0.275
609	9	24	7	0.354	0.945	0.275
626	6	19	6	0.236	0.748	0.236
R4A	6.35	19.05	7.14	0.25	0.75	0.281

Double Row Bearings

Bearing Number	ID (MM)	OD (MM)	Width (MM)	ID (inch)	OD (inch)	Width (inch)
3202	15	35	15.9	0.590	1.378	0.625
3206	30	62	23.8	1.181	2.441	0.937
5202	15	35	15.9	0.590	1.378	0.625
5206	30	62	23.8	1.181	2.441	0.937
5303	17	47	22.2	0.669	1.850	0.874

Wide Bearings

Bearing Number	ID (MM)	OD (MM)	Width (MM)	ID (inch)	OD (inch)	Width (inch)
W204PP	20	47	20.64	0.787	1.850	0.812
W205PP	25	52	20.64	0.984	2.047	0.812
W206PP	30	62	23.81	1.181	2.441	0.937

Self-aligning Bearings

Part Number	Bearing Number	ID (MM)	OD (MM)	Width (MM)	ID (inch)	OD (inch)	Width (inch)
KTN8	2205	25	52	18	0.984	2.047	0.709
TS92	2206	30	62	20	1.181	2.441	0.787

87000 Series Bearings

Bearing Number	ID (B) (MM)	OD (D) (MM)	Width (W) (MM)	ID (B) (inch)	OD (D) (inch)	Width (W) (inch)	Outer Width (Wo) (inch)	Center Width (Wi) (inch)
87501	12	32	12.7	0.472	1.260	0.500	0.394	0.480
87502	15	35	12.7	0.591	1.378	0.500	0.433	0.480
87503	17	40	14.3	0.670	1.575	0.563	0.472	0.538
87504	20	47	15.875	0.787	1.850	0.625	0.551	0.600

What Are Bearings?

Bearings are mechanical components that reduce friction between moving parts while supporting rotational or linear motion. They are used in everything from electric motors and bicycles to automotive transmissions, industrial machinery, pumps, and household appliances.

Selecting the correct bearing requires balancing several factors, including:

Load capacity
Rotating speed
Operating temperature
Lubrication requirements
Environmental exposure
Installation space

Choosing the wrong bearing can lead to excessive wear, vibration, increased maintenance, and premature equipment failure.

Why Bearing Numbers Matter

Bearing numbers provide a standardized way to identify a bearing’s dimensions and specifications. Instead of measuring every component manually, engineers and technicians can simply reference the bearing number to order an exact replacement.

Using bearing numbers correctly helps you:

Select compatible replacement bearings
Match load and speed requirements
Reduce installation errors
Minimize equipment downtime
Improve machine reliability

Components of Bearing Numbers

Bearing numbers comprise alphanumeric codes that specify distinct characteristics crucial for selection and application. These codes typically denote parameters such as bore diameter, outer diameter, width, and specific features like sealing or lubrication types.

Understanding these components is vital for matching bearings to operational requirements, balancing factors such as load capacity versus space constraints or environmental resilience. Challenges may arise from deciphering complex codes or accommodating specific performance demands in varied conditions.

Each alphanumeric code impacts bearing performance and reliability, underscoring the significance of informed decision-making based on accurate bearing number and size chart interpretation.

By mastering these components, engineers can optimize machinery performance, enhance longevity, and mitigate operational risks effectively across diverse industrial and mechanical applications.

How Bearing Numbers Work

Every bearing number contains information about the bearing’s construction and dimensions. While numbering systems vary slightly by manufacturer, most standard bearings follow internationally recognized conventions.

A typical bearing number identifies:

Bearing series – Indicates the bearing’s design and load capacity.
Bore size – Specifies the inner diameter.
Special suffixes – Identify features such as seals, shields, internal clearance, lubrication, or material.

For example:

6205-2RS

62 = Deep groove ball bearing series
05 = 25 mm bore diameter
2RS = Rubber seals on both sides

Understanding these codes makes it much easier to find compatible replacement bearings.

Types of Bearings

Common Types of Bearings

Different bearing types are designed for different operating conditions.

Deep Groove Ball Bearings

The most widely used bearing type. They offer low friction, high speed capability, and are suitable for light to moderate radial and axial loads.

Roller Bearings

Roller bearings provide higher load capacity than ball bearings because they distribute loads across a larger contact area. They are commonly used in heavy industrial machinery.

Needle Bearings

Needle bearings feature long, thin rollers that allow high load capacity while occupying minimal radial space.

Thrust Bearings

Thrust bearings are specifically designed to support axial (thrust) loads rather than radial loads.

Self-Aligning Bearings

These bearings automatically compensate for minor shaft misalignment, reducing wear and extending service life.

Tips for Choosing the Correct Bearing Size

Before purchasing a bearing, consider the following:

Verify the existing bearing number whenever possible.
Measure the inner diameter (ID), outer diameter (OD), and width if the part number is unreadable.
Consider operating speed and load requirements.
Choose sealed bearings for dusty or wet environments.
Select bearings with the appropriate internal clearance for high-temperature applications.
Buy from reputable manufacturers to ensure dimensional accuracy and durability.

Understanding Bearing Size Chart

The bearing size chart helps identify the dimensions and specifications of bearings, making it a crucial tool for selection. By providing detailed information on inner diameter, outer diameter, and width, it assists in matching bearings to specific applications.

However, using the chart involves tradeoffs, such as balancing compact size against load capacity or choosing between standard and specialized bearings for particular conditions. Challenges include interpreting the chart accurately and integrating bearings seamlessly into complex systems.

Each decision affects performance and reliability, highlighting the importance of careful analysis. By understanding and utilizing the bearing size chart effectively, engineers can ensure optimal performance, durability, and efficiency in a wide range of applications.

Common Bearing Size Parameters

Key parameters in a bearing size chart include inner diameter (ID), outer diameter (OD), width, and load ratings. These dimensions determine the bearing’s suitability for specific applications, influencing load capacity and operational fit.

Balancing these factors involves trade-offs, such as choosing a larger OD for higher load ratings while managing space constraints. Challenges can arise from ensuring accurate measurements and compatibility with existing machinery.

Each parameter impacts performance, reliability, and longevity, emphasizing the need for precise selection. By understanding these common size parameters, engineers can make informed decisions, optimizing machinery efficiency and reducing the risk of operational failures. Consulting the bearing size chart thoroughly ensures the best fit for diverse industrial applications.

How to Read a Bearing Size Chart

Learning to interpret a bearing size chart can simplify the process of selecting the right bearing. Start by identifying key parameters such as inner diameter (ID), outer diameter (OD), and width.

Next, consider the load ratings to ensure the bearing can handle the required operational load. Balancing these factors often involves tradeoffs, like choosing a larger bearing for higher loads while managing space limitations. Challenges may arise from deciphering complex charts or matching specific requirements.

Each choice impacts performance and longevity, making it crucial to understand the chart fully. By mastering chart interpretation, engineers can make informed decisions, optimizing machinery performance and reducing downtime across various applications.

Application Examples

Bearing size charts are used across many industries, including:

Automotive wheel hubs and transmissions
Electric motors
Industrial conveyors
Agricultural equipment
Pumps and compressors
HVAC systems
Skateboards and inline skates
Machine tools
Robotics and automation equipment

Using the correct bearing size improves efficiency, reduces maintenance costs, and extends equipment life.

Conclusion

Understanding bearing numbers and size charts makes selecting replacement bearings much easier and more accurate. By knowing how to interpret bearing codes and compare dimensions such as inner diameter, outer diameter, and width, you can confidently choose bearings that meet your equipment’s load, speed, and operating requirements.

Whether you’re maintaining industrial machinery, repairing automotive components, or replacing bearings in electric motors, using the correct bearing size helps improve performance, extend service life, and reduce costly downtime. Always verify the bearing number or carefully measure the existing bearing before ordering a replacement.

FAQ

What is the significance of bearing numbers?

Bearing numbers provide essential information about the bearing’s dimensions and characteristics, such as bore diameter, outer diameter, and width. They help in selecting the right bearing for specific applications, ensuring optimal performance and compatibility.

How do I read a bearing size chart?

To read a bearing size chart, identify key parameters like inner diameter (ID), outer diameter (OD), width, and load ratings. These metrics help determine the bearing’s suitability for your application. Understanding these parameters allows you to balance factors like load capacity and space constraints effectively.

What are the common types of bearings?

Common types of bearings include ball bearings, roller bearings, needle bearings, and thrust bearings. Each type is designed for different load capacities and operational environments, such as high-speed applications, heavy loads, or axial loads.

Why is it important to consider tradeoffs when selecting bearings?

Selecting the right bearing involves tradeoffs, such as balancing load capacity with size or choosing between standard and specialized bearings for specific conditions. Understanding these tradeoffs helps ensure the bearing meets your operational requirements and performs reliably.

How does the bearing size chart impact performance and reliability?

The bearing size chart impacts performance and reliability by providing accurate measurements and specifications. Properly interpreting the chart ensures the bearing fits your machinery, handles the required load, and operates efficiently, reducing the risk of failures and downtime.
How do I identify a bearing if the number has worn off?

Measure the bearing’s inner diameter (ID), outer diameter (OD), and width using a caliper. These measurements can usually be matched to a standard bearing size chart.

Are bearing numbers universal?

Most standard metric bearings follow ISO standards, making their dimensions consistent across many manufacturers. However, suffixes for seals, shields, or internal clearance may vary slightly by brand.

What do sealed and shielded bearings mean?

Sealed bearings use rubber seals to keep contaminants out and retain grease, while shielded bearings use metal shields that provide less protection but allow lower friction at higher speeds.

Bearing Number And Size Chart