How to find the right Mounted Flange Block Bearings AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Mounted Flange Block Bearings
- Bolt pattern
- Choose the style by bolt count and shape: 4-bolt square (UCF type), 2-bolt oval (UCFL type), 3-bolt (UCFB type), or piloted round (UCFC type). The bolt count sets how much load the flange carries and whether it fits the existing holes or frame plate.
- Bolt spacing and bolt size
- Match the bolt-hole center distance and bolt diameter exactly to the old unit or the frame drawing. Bore size alone does not fix the bolt spacing, which can differ between US-pattern and metric-pattern housings.
- Load direction
- Use 4-bolt or piloted flanges for heavier radial loads. Keep 2-bolt flanges for light loads, or where space is narrow. A 2-bolt flange resists less moment and can rock loose under heavy or shock loads.
- Piloted location
- Use a piloted flange (UCFC type) when the bearing must be concentric with a bored hole in the frame. The pilot spigot locates the shaft centerline precisely without relying on clearance in the bolt holes.
- Insert locking and sealing
- Apply the same rules as for all mounted bearings: set screw for light one-direction duty, collar or adapter for reversing duty, and triple-lip seals for dirt or water. Flange units often sit on machine walls exposed to spray and debris.
- Mounting surface
- Mount against a flat, rigid surface, and support the shaft at both ends. Flexing sheet metal misaligns the bearing and loosens the bolts.
Brands that matter
- SKF: Square, oval and round flanged Y-bearing units, including food-grade versions.
- Dodge: Heavy-duty flange units for conveyors and process equipment.
- Sealmaster: Wide flange range for US maintenance replacement.
- Timken: Fafnir flange units in standard and stainless versions.
- FYH: Japanese UC-pattern flanges, including stainless and resin.
- AMI Bearings: Many flange styles, including thermoplastic washdown units.
What to avoid
- 2-bolt flanges on heavy or shock-loaded shafts.
- Mounting a flange on thin, unbraced sheet metal.
- Mixing up 2-bolt and 3-bolt patterns when ordering a replacement.
Questions
What is the difference between UCF and UCFL?
UCF is a 4-bolt square flange and UCFL is a 2-bolt oval flange. Both commonly take the same UC insert of the same size.