Centrifugal Fan Bearing Set

The failure of a bearing insert is not the only picture of the whole incident. In fact, most field failures happen due to the entire bearing assembly (insert, housing, seal and mounting) exceeding its stipulated tolerances. And the main reasons behind this are dirt accumulation in the grease, inadequate relubrication system, housing deformation due to incorrect bolt torque or seal joint damage due to excessive thermal cycling. A Centrifugal Fan Bearing Set solves this at the system level. It is supplied as a complete matched set comprising bearing insert, cast iron split housing, two side seals, adapter sleeve and lock nut, all assembled together as a Plummer block. Cast iron and cast steel housings are chosen instead of pressed steel because they are stronger, distribute weight better on the base frame, and help keep the bearing seats cooler.

The SNH series plummer block housing is a proven standard for use in standard and medium-heavy industrial fans with shaft diameters from 20 mm to 140 mm. In large-sized heavy industrial fans with shaft diameters from 115 mm to 530 mm, the SNS series split Plummer block housing is mainly chosen. Its optimized lubrication system and improved seal geometry result in a 50% longer bearing operating life than conventional housings, which is absolutely perfect according to the targets of AMCA 99 and ISO 281 standards. Each fan shaft installation essentially requires two sets of bearings, which are mounted in a fixed-locating and expansion-non-locating configuration. The fixed bearing on the drive side takes both radial and axial thrust stresses and secures the shaft in place. The expansion bearing on the impeller side, on the other hand, solely takes radial loads. Its main function is to ensure that the shaft, due to heat, is controlled and expanded very smoothly. If you insert in two fixed or two expansion set you will get premature bearing failure. The typical grease used in every Centrifugal Fan Bearing Set is Lithium base grease LGMT2 / LGMT3 grade. However, for fans that operate with process air temperatures above 150°C, there is also the option of choosing a special high-temperature grease grade.

• SNH series plummer block: shaft 20~140 mm; self-aligning ball or spherical roller insert
• SNS split plummer block: shaft 115~530 mm; spherical roller; 50% life improvement
• Fixed / Locating and Expansion / Non-locating matched pair supply available
• Seal options: (V-ring / Labyrinth / Taconite) standard to extreme contamination duty
• Grease: (LGMT2 / LGMT3 lithium base) standard; high-temperature grade on request
• Housing material: Cast iron standard; Cast stee) heavy duty option

Available Brands: Available prestigious international and national top brands. SKF / FAG (Schaeffler) / NSK / NTN / Timken / Equivalent - per shaft diameter and application

To order: Contact us with your fan model, shaft diameter (mm), operating RPM, motor kW, and bearing position (drive-side fixed or impeller-side expansion) - or provide existing bearing set number for direct replacement.