Mounted Bearing Construction and Materials
Bearing housings are most commonly constructed of gray cast iron (HT200)
in one piece for maximum strength, rigidity and durability. Mounting surfaces
and bearing seats are machined for proper alignment. Solid bases provide support
around the bolt-hole area.
Properties of HT 200:
Major wall thickness
of casting piece
(mm) |
Minimum strain stress
—b min. (N/mm2) |
Hardness
(HB) |
>2.5-10
>10-20
>20-30
>30-50
|
220
195
170
160
|
157-236
150-225
139-209
129-192
|
Also available are pressed stamped steel housings for light duty applications;
and nickel-plated, stainless steel and thermoplastic housings for corrosive applications
(such as pharmaceuticals, food processing, chemicals and photo processing). These housings
resist rust and deterioration and are ideal for wash down situations.
Bearing Inserts
Inserts are constructed of high quality SAE-52100 vacuum degassed, high carbon, chromium
bearing steel. Rings are hardened to HRC 59-63 for high wear resistance and contact fatigue
strength. An annealed area around the set screws is hardened to less than HRC50, preventing
the inner ring from cracking while set screws are tightened and allowing for maximum holding power.
Many insert sizes are also available in AIS-440C martensitic stainless steel for use in
corrosive environments.
Unlike standard deep groove ball bearings, the outer rings of bearing inserts are ground
to a sphere to match the internal dimension of the housing. This permits self-alignment between
the two components. A standard anti-rotation device prevents the insert from rotating within the housing.
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