SKF Split Housings: Guide to Choosing SNL, SAF, SNH, SONL and Solid Base

The SNL split housing is the most widespread option for mounting self-aligning bearings on adapter sleeves on transmission shafts. Its body split into two halves allows inspecting or replacing the bearing without dismounting the shaft or couplings. The flat base and through holes facilitate mounting on frames or machine structures.

In Argentine industry it appears in conveyors, fans, centrifugal pumps and medium-sized gearboxes. The housing is chosen according to the shaft diameter and the selected bearing, which can be ball or spherical roller. Some codes in the series are SNL 211 and SNL 216.

To get a quote, it is advisable to indicate the complete housing code, the bearing and the sleeve if you already have them defined. If you only know the shaft size, we help you select the assembly. A common mistake is ordering the housing without verifying the seal type: SNL can use felt seals, labyrinth seals or radial lip seals depending on the application.

The SAF split housing is designed for high load conditions and larger diameter shafts, typical in mining, cement and aggregate plants. Its reinforced construction and generous dimensions allow housing large spherical roller bearings. The cap and base are precisely machined to ensure bearing alignment.

SAF models are identified with a number that refers to the corresponding bearing, such as SAF 322 or SAF 520; the exact equivalent is confirmed with the complete code. Seal choice is critical: in dusty or humid environments a labyrinth or taconite seal is recommended.

When ordering an SAF housing, it is important to specify whether it is needed with adapter sleeve or with cylindrical seat. It is also advisable to indicate the load direction and whether the housing will be fixed or floating. At MR we quote the housing, bearing, sleeve and seals as an assembly to avoid incompatibilities.

The SNH split housing is another series of SKF split housings that is still present in many installed machines. It maintains the advantage of the split body and accepts bearings with adapter sleeve, which facilitates maintenance.

It is found in machine tools, lifting equipment and light conveyors. Codes such as SNH 530 or SNH 517 indicate the housing size according to the bearing.

To get a quote for an SNH, send the housing code or the shaft dimensions and estimated load. A frequent mistake is confusing SNH with SNL: although they look similar, it is advisable to confirm the mounting dimensions before replacing one with the other. We help you confirm the correct series from the nameplate or the equipment manual.

The SONL split housing is another series of SKF split housings that maintains the logic of the body split into two halves. It is found in industrial fans, pumps and heavy machinery, where being able to open the housing without dismounting the shaft saves hours of downtime.

Each housing is identified by a code that defines its size and configuration. It is essential to respect the original seal to maintain protection against contaminants.

When ordering a SONL, it is advisable to indicate the complete code and the bearing to be mounted. If you do not have the code, send us a photo of the nameplate or the shaft and housing dimensions. At MR we quote the assembly housing, bearing, sleeve and seal so you do not have to look for parts separately.

The solid base split housing is a reinforced version of the split housing, with a taller and more rigid base for highly demanding applications. It is used in mills and continuous process equipment where mounting stability is critical.

Models such as SSNLD 517 or SSNLD 528 correspond to solid base housings for bearings with sleeve. To quote them accurately, it is advisable to send the complete code as it appears on the part.

To get a quote for a solid base housing, send the complete code or the shaft and bearing dimensions. It is important to verify the shaft center height and the distance between mounting holes. We help you confirm the correct series and quote the complete assembly promptly.

The split housing is only one part of the assembly: the bearing, the adapter sleeve and the seals must be selected together. The bearing can be self-aligning ball, spherical roller or cylindrical roller depending on load and speed. The sleeve allows fixing the bearing to the shaft without machining a shoulder.

Sleeves are designated with the H series and the bearing number, such as H 211 or H 316. The seal can be felt, labyrinth, taconite or a radial lip seal. The choice depends on the environment: in dusty places labyrinth or taconite is preferred, while in clean environments felt is sufficient.

When ordering the assembly, indicate the housing code and the bearing if you have them. If not, send the shaft dimensions, approximate load and working conditions. At MR we quote the housing, bearing, sleeve and seals as a single order to avoid compatibility errors.

One of the most frequent mistakes is ordering the housing without the sleeve or seal, assuming they are included. In most cases, the housing is sold separately from the bearing and accessories. Another mistake is confusing series: an SNL and an SNH can look the same, so it is advisable to confirm the mounting dimensions.

It is also common to choose the wrong seal for the working environment. A felt seal in a quarry wears out quickly and lets contaminants in, while a labyrinth in a clean environment is an unnecessary expense. Always verify the original seal type and operating conditions.

When mounting, respect the radial clearance indicated for the bearing and the sleeve tightening. Excessive tightening can damage the bearing, and insufficient tightening causes slipping on the shaft. If you have doubts, consult us with the code or a photo of the part and we will guide you in the selection.