Enhanced Split Plummer Block Housings — combining a strengthened housing design with greater flexibility in bearing mounting, sealing, lubrication and foundation arrangements.
SMR SNH Series plummer block housings are an enhanced development of the SN and SNA Series, combining a strengthened housing design with greater flexibility in bearing mounting, sealing, lubrication and foundation arrangements.
The SNH Series retains the established bearing centre height and foundation bolt-hole dimensions of the earlier SN and SNA housings, making it suitable for replacement and interchangeability in corresponding arrangements.
The horizontally split construction provides convenient bearing installation, inspection and maintenance, while the improved housing section provides greater strength and rigidity compared with the earlier SN and SNA designs.
SMR SNH Series plummer block housings are designed as a further development of the SN and SNA Series, offering a stronger and more versatile housing platform for a wider range of bearing arrangements.
The SNH housing incorporates an improved cross-sectional design with a strengthened base and rib arrangement, providing greater housing rigidity and load-carrying capability while retaining the familiar split-housing configuration.
SNH housings are interchangeable with corresponding SN and SNA housings with respect to bearing centre height and foundation bolt-hole dimensions, making the series suitable for replacement and upgrade requirements where the corresponding dimensional arrangement is maintained.
The building-block approach allows different combinations of bearing mounting, sealing, lubrication and accessories to be configured according to the required arrangement.
The improved housing cross-section and strengthened rib arrangement provide greater rigidity and load-carrying capability compared with the earlier SN and SNA designs.
SNH housings maintain the established bearing centre height and foundation bolt-hole dimensions of corresponding SN and SNA housings, facilitating replacement in suitable arrangements.
The horizontally split construction provides convenient access for bearing installation, inspection, maintenance and replacement.
Cylindrical-bore bearings can be mounted directly on the shaft, while tapered-bore bearings can be mounted using suitable adapter sleeves.
A range of sealing arrangements is available, allowing the housing to be configured according to the required level of protection against external contamination.
The bearing seating allows axial movement where required. Locating rings can be fitted where a fixed bearing arrangement is required.
SNH housings can be configured for grease lubrication, with oil lubrication available for suitable arrangements.
Standard and alternative foundation-hole arrangements are available where additional mounting rigidity is required.
Eye bolts are provided on larger housing sizes for easier handling during installation and maintenance.
Dowel pins at the housing mating surface ensure correct alignment during assembly and prevent interchangeability between individual bases and caps.
The SNH Series provides a comprehensive range of sealing arrangements to suit different operating requirements.
Felt seal arrangement providing effective grease retention and protection against normal levels of dust and external contamination.
A V-ring sealing arrangement providing enhanced protection against external contamination compared with standard felt sealing.
Double-lip seal arrangement providing enhanced sealing protection for applications requiring greater resistance to external contamination.
Four-lip seal arrangement providing enhanced sealing with multiple sealing lips while maintaining relatively low friction.
A non-contact sealing arrangement providing enhanced protection against external contamination while avoiding direct rubbing contact at the sealing interface.
A heavy-duty sealing arrangement available for particularly demanding environments where enhanced protection against severe contamination is required.
The SNH Series allows the housing to be configured with different combinations of:
This provides flexibility to select the housing configuration 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 SNH housing design incorporates provision for 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.
| SNH Series | Bearing Bore | Mounting | Compatible Bearing Series |
|---|---|---|---|
| SNH 200 | Cylindrical | Direct | 1200 · 2200 · 22200 CC · 23200 CC |
| SNH 300 | Cylindrical | Direct | 1300 · 2300 · 21300 CC · 22300 CC |
| SNH 500 | Tapered | Adapter Sleeve | 1200K · 2200K · 22200CCK · 23200CCK |
| SNH 600 | Tapered | Adapter Sleeve | 1300K · 2300K · 22200CCK · 23200CCK |
The bearing seating of the SNH 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.
This allows the same housing platform to accommodate both locating and non-locating bearing arrangements.
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.
SNH 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.
SNH 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 SNH range can also be supplied in an SSNHD 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 SNH Series provides a stronger and more configurable housing platform than the standard SN Series, with greater flexibility in sealing, lubrication, mounting and foundation arrangements.
The appropriate configuration can be selected according to the bearing arrangement, shaft mounting method and required level of sealing and housing support.
For particularly demanding operating conditions, SMR can recommend an appropriate advanced housing configuration based on the required bearing and housing arrangement.
The overall fitment dimensions of the SNH Series conform to ISO 113:2010.
Eye bolts are provided on larger SNH 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 SNH housing and configuration.