How to Read Rexnord Codes: Designation Structure, Prefixes, Suffixes, and Real Examples

Rexnord codes follow an internal logic that combines letters and numbers to identify the product type, dimensional series, and specific characteristics. Understanding this structure allows you to order the correct replacement part without errors and compare alternatives accurately. In this guide, we review the most common patterns in housings, spherical roller bearings, Y-housings with insert bearings, friction bushings, and Y-bearings.

Rexnord is a recognized brand in power transmission and industrial components. Its designations are not arbitrary: each prefix or suffix provides information about design, material, or application. For example, in housings, the initial letters indicate the housing series, while the numbers usually refer to the shaft diameter or the size of the bearing they house.

Below, we break down the main product groups and their codes, with real examples we supply at MR Accesorios Industriales. If you need a specific replacement part, you can send us the code and we will provide a quote shortly.

Rexnord housings are identified with codes such as ZA6107, ZA6206, or ZB2308. The initial letter indicates the housing series: ZA and ZB are common series for industrial applications. The following number is usually related to the shaft diameter or the size of the bearing mounted in the housing.

For example, in ZA6107, the prefix ZA corresponds to a pillow block housing series, and 6107 suggests a bearing of the 60 series with a bore diameter of 35 mm (07 × 5 mm). In ZB2308, the ZB series is similar but with construction differences, and 2308 indicates a self-aligning bearing of the 23 series with a bore diameter of 40 mm.

It is important to verify the complete code engraved on the part or on the equipment plate. If you have doubts, you can send us a photo of the housing or bearing and we will help you identify the replacement part.

Rexnord spherical roller bearings (also called self-aligning roller bearings) have a U suffix in their designation, such as 2315U, 9200U, or 5303U. The U indicates a bearing with a machined cage or specific Rexnord design, and the preceding number corresponds to the dimensional series of the bearing.

For example, 2315U is a spherical roller bearing of the 23 series, with a bore diameter of 75 mm (15 × 5 mm). 5303U is of the 53 series, with a bore diameter of 17 mm. These bearings support combined radial and axial loads and are common in applications with misalignment.

When ordering a replacement part, it is key to indicate the complete code, including the U, because there may be versions without that suffix with internal differences. At MR we work with the Rexnord line and provide a quote for the exact bearing according to your needs.

Rexnord Y-housings with insert bearing are designated with codes such as P4B-203-T, P2B-208-T, or P2B-307-T. The prefix P indicates a Y-type housing (pillow block, with two or four mounting holes), and the number following the letter (4 or 2) refers to the housing series. The number after the hyphen (203, 208, 307) corresponds to the insert bearing mounted.

The suffix T usually indicates a specific seal or feature, such as a triple-lip seal or a cover. For example, P2B-208-T is a pillow block housing of the P2B series with insert bearing 208 and T seal. These assemblies are widely used in conveyors, fans, and agricultural machinery.

To replace a Y-housing, it is advisable to verify both the housing code and the insert bearing code, because they are sometimes sold separately. If you have the complete code, we will provide a quote without delay.

Rexnord friction bushings (friction sleeves) are identified with long numeric codes, such as 701-66008-040, 701-66024-096, or 701-66004-024. The prefix 701 is common in this line, and the following numbers indicate dimensions and material.

For example, in 701-66008-040, the 66008 could refer to a bore diameter of 8 mm and the 040 to a length of 40 mm, although the exact interpretation depends on the manufacturer's catalog. These bushings are used in sliding applications where a bearing is not required.

When ordering a bushing, it is essential to copy the complete code as it appears on the part or in the technical documentation. If you are not sure, send us a photo with a ruler next to it and we will help you identify it.

Rexnord Y-bearings (also called inserts) are designated with codes such as 3107U, 3315U, or 3207U. The initial number (3) indicates the bearing series, and the following two digits correspond to the bore diameter in millimeters divided by 5. The final U is characteristic of Rexnord.

For example, 3107U has a bore diameter of 35 mm (07 × 5), and 3315U of 75 mm (15 × 5). These insert bearings are mounted in Y-housings and have a spherical outer ring to compensate for misalignment. They are easy to assemble and maintain.

If you need to replace an insert, check the code engraved on the outer ring or on the seal. With that data, we will provide a quote for the exact replacement part and indicate if there are compatible alternatives.

To avoid errors when ordering a Rexnord replacement part, follow these steps: 1) Locate the complete code on the part, plate, or manual; 2) Also note the main dimensions (bore, outer diameter, width) if possible; 3) Take a clear photo of the part and the code; 4) Send us that information via WhatsApp or email.

At MR Accesorios Industriales, from Buenos Aires, Argentina, we supply the Rexnord line and work with a wide variety of references. Do not hesitate to contact us: we will provide a quote for the replacement part with the code, measurement, or a photo, and indicate the most suitable alternative for your application.

Remember that correct identification of the code saves time and avoids unnecessary downtime. Our technical team is here to help you interpret the nomenclature and find the component you need.