Advanced High-Rigidity Split Plummer Block Housings — a reinforced base and improved housing construction for higher load, speed, vibration and temperature requirements.
SMR SNL Series plummer block housings are an advanced development of the SN, SNA and SNH housing platforms, designed with a reinforced base and improved housing construction for higher load, speed, vibration and temperature requirements.
The SNL Series combines a robust housing structure with a wide choice of bearing mounting, sealing, lubrication and monitoring provisions, allowing the housing to be configured for a broad range of demanding operating conditions.
The horizontally split construction provides convenient access for bearing installation, inspection, maintenance and replacement.
SMR SNL Series plummer block housings represent a further development of the SN, SNA and SNH Series, incorporating a reinforced base, increased housing rigidity and improved heat dissipation.
The housing base incorporates additional material around the foundation attachment areas, together with reinforced ribs, providing improved seating and greater structural stability.
The SNL design also provides increased surface area between the housing base and the base plate, helping improve heat transfer away from the bearing housing and supporting controlled operating temperatures.
The SNL Series follows a building-block principle, allowing different combinations of bearing mounting, sealing, lubrication, axial location and monitoring arrangements to be selected according to the required configuration.
The reinforced base incorporates additional material around the foundation attachment areas and strengthened rib arrangements to provide improved housing rigidity and stability.
The increased contact surface between the housing and base plate provides improved heat flow away from the bearing housing, helping maintain suitable operating temperatures.
The strengthened housing structure is designed to provide increased load-carrying capability and improved resistance to vibration compared with earlier housing designs.
Cylindrical-bore bearings can be mounted directly on the shaft, while tapered-bore bearings can be mounted using suitable adapter sleeves.
A comprehensive range of sealing arrangements is available, allowing the housing to be configured for different levels of contamination protection and operating conditions.
The bearing seating allows axial movement where required. Locating rings can be fitted where a fixed bearing arrangement is required.
SNL housings can be configured for grease or oil lubrication, depending on the bearing and operating arrangement.
The housing provides provisions for integrating vibration and temperature monitoring where condition monitoring is required.
Precision markings and provisions for additional devices, holes and accessories assist with installation and integration of monitoring or other equipment.
Eye bolts are provided on larger housing sizes for easier handling during installation and maintenance.
The SNL Series offers an extensive choice of sealing arrangements.
Felt seal arrangement providing effective grease retention and protection against normal levels of dust and external contamination.
Combination seal comprising a mild steel washer with 'O' cord and rubber V-ring seal, providing enhanced protection compared with standard felt sealing.
Double-lip seal arrangement providing enhanced protection against external contamination compared with standard felt sealing.
Four-lip seal arrangement providing enhanced sealing with multiple sealing lips and relatively low friction, making it suitable for applications where higher speeds are required.
A non-contact sealing arrangement providing enhanced protection against external contamination without direct rubbing contact at the sealing interface.
A heavy-duty sealing arrangement designed for particularly demanding environments where enhanced protection against severe external contamination is required.
The SNL Series can therefore be configured with the sealing arrangement appropriate to the required operating environment and bearing arrangement.
The SNL Series follows a modular configuration approach, allowing combinations of:
This allows the housing to be configured according to the bearing and installation requirement rather than being restricted to a single standard arrangement.
Grease nipples are provided for convenient bearing relubrication. The grease inlet position can be arranged according to the bearing configuration.
For W33-type bearings having an annular groove, the grease nipple can be positioned through the centre of the housing cap. For other bearing arrangements, the grease nipple is fitted on the sides.
Suitable grease nipple/dimple arrangements can be provided on the housing cap as applicable.
The SNL housing incorporates provision for the drainage of used or excess grease. A drain plug is provided at the bottom of the housing, allowing contaminated or excess grease to be removed during maintenance.
| SNL Series | Bearing Bore | Mounting | Compatible Bearing Series |
|---|---|---|---|
| SNL 200 | Cylindrical | Direct | 1200 · 2200 · 22200 CC · 23200 CC |
| SNL 300 | Cylindrical | Direct | 1300 · 2300 · 21300 CC · 22300 CC |
| SNL 500 | Tapered | Adapter Sleeve | 1200K · 1300K · 2200K · 2300K · 22200CCK · 23200CCK |
| SNL 600 | Tapered | Adapter Sleeve | 1200K · 1300K · 2200K · 2300K · 22200CCK · 23200CCK |
The SNL housing allows the bearing to accommodate axial movement where required. Where a fixed bearing arrangement is required, suitable locating rings can be fitted to provide axial location of the bearing.
Depending on the bearing size and arrangement, one or two locating rings may be used.
For installations where the housing is positioned at the end of the shaft, an end cover can be provided. The end-cover arrangement can be selected in combination with the required shaft-sealing configuration.
SNL housings are available with different foundation mounting arrangements.
Two elongated foundation slots.
Two drilled foundation slot holes.
Four drilled foundation slot holes.
The alternative MS1 and MS2 arrangements can be provided where additional mounting rigidity is required, including applications involving significant vibration or severe loading.
SNL Series housings are available in:
Higher grades of the respective standard materials can be supplied on request, subject to requirement.
For extremely heavy loading conditions, the SNL range can also be supplied in an SSNLD configuration with a solid base in S.G. / ductile iron material.
This configuration is available with four foundation slots to provide additional mounting rigidity.
The SNL housing provides provisions for integrating condition-monitoring devices, including vibration and temperature monitoring arrangements.
Additional holes and mounting provisions can be incorporated where required for monitoring devices and other accessories.
This makes the SNL platform particularly suitable where the housing forms part of a condition-monitoring or predictive-maintenance system.
The SNL Series is designed as a higher-performance housing platform for applications involving higher loads, speeds, vibration or temperature requirements compared with standard general-purpose housing arrangements.
The combination of reinforced housing construction, improved heat dissipation, multiple sealing options and flexible lubrication allows the SNL configuration to be selected according to the required operating conditions.
The appropriate housing, bearing, sealing and lubrication arrangement should be selected together to achieve the required operating performance.
The overall fitment dimensions of the SNL Series conform to ISO 113:2010.
Eye bolts are provided on larger SNL housing sizes to facilitate easier handling during installation and maintenance.
Applicable sizes include: 224 / 320 / 524 / 620.
Provide your shaft diameter and bearing number, and the SMR team can help identify the appropriate SNL housing and configuration.