SNL, SN, SAF and TVN split housings of our own manufacture: dimensions, sleeves and how to order them

A split housing is a cast iron part that houses a bearing and secures it to a base or structure. It is called split because its body is divided into two halves: the base and the cap. This allows the bearing to be mounted and dismounted without dismantling the entire shaft.

In Argentine industry they are used in conveyors, fans, pumps, mills and any machine with horizontal shafts. The bearing is mounted on an adapter sleeve that tightens it to the shaft, and the housing keeps it aligned and lubricated.

Split housings are a robust and easy-to-maintain solution. Being able to open the cap allows the bearing to be inspected, the grease to be renewed or the assembly to be replaced without dismantling the entire transmission.

The most common series are SNL, SN, SAF and TVN. Each has construction features that make it suitable for different loads and working conditions.

The SNL series is the most widespread in general industry. It has a split base and a cap with grooves for seals. It is used with self-aligning ball bearings or spherical roller bearings with tapered or cylindrical adapter sleeves. Models SNL 211 and SNL 216 are typical examples.

The SN series is similar to SNL but with an older design and lower load capacity. It is still used in existing equipment. The SAF series is of American origin, with inch dimensions and a wider base, ideal for heavy loads. The TVN series is a variant of SNL with a reinforced cap for applications with vibration.

SNL housings are designated with a number that indicates the shaft diameter in millimeters. For example, SNL 211 corresponds to a 55 mm shaft and SNL 216 to an 80 mm shaft. The number after the letters is the code of the bearing it houses.

Each SNL housing is combined with an adapter sleeve and a specific bearing. The sleeve can be tapered (H series) or cylindrical (OH series). The choice depends on the type of shaft and the mounting method.

To order an SNL housing, it is advisable to indicate the complete housing code, the bearing and the sleeve. If you do not have the code, you can measure the shaft diameter and the center distance between the mounting holes.

The SAF series is characterized by its solid base and its inch dimensions. It is the preferred option in mining, cement and aggregate plants, where loads are high and shafts are large in diameter.

SAF housings are designated with a number that indicates the shaft diameter in inches. For example, SAF 322 corresponds to a 3 1/4 inch shaft and SAF 520 to a 5 inch shaft. The number after the letters is the code of the bearing.

Like SNL, SAF housings are used with self-aligning bearings and adapter sleeves. The main advantage is their greater rigidity and ability to absorb impacts. They are heavier and require a firm support base.

Within the SKF line, solid-base housings such as SSNLD are used when maximum stability and precise alignment are required. The base is not split, which reduces deflection and improves load distribution.

Models SSNLD 517 and SSNLD 528 are examples of this series. They are mounted with spherical roller bearings and tapered adapter sleeves. They are ideal for applications with high speed or combined loads.

The choice between split base and solid base depends on the machine design and load conditions. In general, the solid base is preferred in new equipment or in replacements where the bedplate can be modified.

To get a quote for a split housing, the most practical thing is to send the complete code of the housing, for example SNL 211 or SAF 322. If you do not have it, you can send a photo of the part or indicate the main dimensions: shaft diameter, center distance between the mounting holes and total height.

It is also useful to know the type of bearing it takes and the sleeve. With that data, we indicate the equivalent housing and quote the complete assembly.

At MR Accesorios Industriales we sell SNL, SN, SAF and TVN split housings of our own manufacture. We work with the SKF line and other brands. Write to us via WhatsApp or email with the code, the dimension or a photo of the part and we will quote you promptly.

Below we answer the most common questions we receive from maintenance managers and buyers.

If you have a specific inquiry, do not hesitate to write to us. Our technical team advises you without obligation.