In a ucfl200 series two-bolt flange units, Cast Iron is the housing that carries the bearing and bolts to the machine. The grade is grey cast iron EN-GJL-200 / EN-GJL-250 for standard housings; ductile iron EN-GJS where shock or tension is expected; it is magnetic, and its usable service range is about -20 °C to +200 °C for a standard grey iron housing. This page covers what the material changes about the bearing, the limits it brings with it, and the sizes supplied.
Why Cast Iron for UCFL200 Series Two-Bolt Flange Units
The housing material for pillow blocks, flange units and plummer blocks — rigid, well damped, and stable enough to hold a round, correctly sized bearing seat after machining. In a ucfl200 series two-bolt flange units it is the housing that carries the bearing and bolts to the machine.
A bearing housing has to be stiff, well damped and dimensionally stable, and it has to hold a round bore after machining and after bolting down. Grey cast iron does all four cheaply, which is why almost every pillow block and plummer block is made of it.
Material Properties
| Grade designation | grey cast iron EN-GJL-200 / EN-GJL-250 for standard housings; ductile iron EN-GJS where shock or tension is expected |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | About -20 °C to +200 °C for a standard grey iron housing |
| Corrosion characteristic | Forms a stable surface oxide indoors; painted or coated for outdoor and washdown service |
Alternatives and When to Switch
Ductile iron or cast steel where shock and tension are expected; pressed steel where weight matters more than stiffness; and thermoplastic or stainless housings for washdown and food service, where the failure is corrosion and not load.
What the Material Changes About the Bearing
The housing does not carry the rolling contact, but it decides the fit. It has to hold the bearing seat round and to size after machining and after the feet are bolted to a base that is never perfectly flat, and it has to conduct the heat the bearing generates away into the structure. A distorted housing is a bearing running with the wrong clearance.
Sizes of UCFL200 Series Two-Bolt Flange Units Available in Cast Iron
| Designation | Shaft bore d (mm) | Insert bearing | Housing material |
|---|---|---|---|
| UCFL201 | 12 | UC201 | Grey cast iron |
| UCFL202 | 15 | UC202 | Grey cast iron |
| UCFL203 | 17 | UC203 | Grey cast iron |
| UCFL204 | 20 | UC204 | Grey cast iron |
| UCFL205 | 25 | UC205 | Grey cast iron |
| UCFL206 | 30 | UC206 | Grey cast iron |
| UCFL207 | 35 | UC207 | Grey cast iron |
| UCFL208 | 40 | UC208 | Grey cast iron |
| UCFL209 | 45 | UC209 | Grey cast iron |
| UCFL210 | 50 | UC210 | Grey cast iron |
| UCFL211 | 55 | UC211 | Grey cast iron |
| UCFL212 | 60 | UC212 | Grey cast iron |
| UCFL213 | 65 | UC213 | Grey cast iron |
| UCFL214 | 70 | UC214 | Grey cast iron |
| UCFL215 | 75 | UC215 | Grey cast iron |
| UCFL216 | 80 | UC216 | Grey cast iron |
| UCFL217 | 85 | UC217 | Grey cast iron |
| UCFL218 | 90 | UC218 | Grey cast iron |
