New plummer blocks from NSK
SNN and SD series offer high levels of sealing and protection for demanding industrial environments
NSK’s new SNN and SD series of plummer blocks combine the traditional time-saving and easy mounting benefits of integrated bearing units with high levels of sealing and mechanical protection for use in demanding industrial environments, such as quarrying, mining, cement and materials handling.
Designed for easy fitment on conveyors, crushers, feeders and general handling equipment, the new plummer blocks feature high-rigidity cast iron housings – including webs for heat transfer, high-capacity double-row self-aligning ball bearings or spherical roller bearings, five types of seal for the most demanding operating conditions, and a square base that facilitates alignment and minimizes deformation caused by over-tightening of the mounting bolts.
The SNN 500 (light) series and SNN600 (medium series) comprise a number of housing types, which, when combined the comprehensive seal options available and ball or spherical roller bearings, provide a solution for most plummer block applications with shaft diameters from 20mm to 140mm. For heavier-duty applications, the SD series are combined with large spherical roller bearings for use on shaft sizes from 150mm to 380mm. Both the SNN and SD series plummer blocks offer users the flexibility of either oil or grease lubrication.
For operation in adverse environments, a range of sealing options is offered for the SNN housings. These range from the G-type double-lip polyurethane to the C-type mild steel plus wool and rayon seals, for shaft speeds up to 5m/s and temperatures up to 100°C; to the V-type and taconite seals which can operate up to 7m/s and temperatures in excess of 120°C. Labyrinth and taconite seal options are also offered on the SD series.
NSK have produced a new publication covering the SNN and SD series of plummer blocks. Free copies of the publication, entitled: ‘Plummer Blocks and Accessories’ can be obtained by calling Freephone 0500 2327464 and quoting the publication title and reference: PLU/A/E/02.12.
