Oval Flange Linear Bearing for Compact Directional Mounting
Oval Flange Linear Bearing is designed for linear shaft systems where a round flange is not directional enough and a square flange takes too much mounting space. The oval flange keeps a stable mounting face around the bearing while reducing unnecessary corner area, making it suitable for compact plates, narrow frames and equipment with limited clearance.
DLY LMH series oval flange linear bearings combine a shaft-guiding linear ball bearing with an integrated oval mounting flange. They are used with round linear shafts to support smooth, low-friction linear movement in automation equipment, packaging machinery, measuring devices, compact actuators and other linear motion systems.
Why Use an Oval Flange Instead of a Round or Square Flange?
The value of an oval flange is not only its shape. It solves a real installation problem: the bearing must be fixed securely, but the surrounding machine structure may not have enough space for a full square flange.
Compared with a round flange, the oval flange provides a clearer mounting direction and a longer support area along one axis. Compared with a square flange, it removes unused corner space and is easier to fit into narrow or irregular mounting areas.
This makes the LMH oval flange linear bearing useful when the equipment needs shaft guidance, compact mounting and stable orientation at the same time.
What Makes the Oval Flange Necessary?
In many machines, the bearing is not mounted on a large open plate. It may be installed near a frame edge, between two structural ribs, beside a motor bracket, or inside a compact linear module. In these cases, the flange shape directly affects whether the bearing can be installed without interference.
| Installation Need | Why Oval Flange Helps | Typical Situation |
|---|---|---|
| Limited side clearance | The oval outline reduces the corner envelope compared with a square flange. | Mounting near machine frames, side plates or narrow brackets. |
| Directional installation | The long-axis and short-axis shape gives the bearing a clear mounting orientation. | Compact linear units where bearing direction needs to follow the moving axis. |
| Stable but not oversized mounting | It keeps a flange mounting surface without using the full square flange footprint. | Small equipment, light automation, testing devices and packaging mechanisms. |
| Avoiding surrounding interference | Rounded sides help reduce conflict with nearby screws, walls or moving components. | Machines with compact layouts and many closely arranged parts. |
LMH Oval Flange vs. LMF Round Flange vs. LMK Square Flange
LMF, LMK and LMH all belong to flanged linear bearing structures, but their mounting logic is different. The oval flange should not be described in the same way as a round or square flange. It has its own reason for use: compact directional mounting.
| Flange Type | Model Code | Mounting Character | Better For | Not the Best Choice When |
|---|---|---|---|---|
| Round flange | LMF | Balanced circular mounting around the shaft center. | General mounting plates with enough surrounding space. | The structure needs a clear long-axis mounting direction or a narrow footprint. |
| Square flange | LMK | Four-corner mounting with a larger rectangular footprint. | Rigid plates and applications where mounting area is not limited. | The corner area causes interference or the mounting plate is too narrow. |
| Oval flange | LMH | Oblong mounting face with reduced corner area and clear orientation. | Compact layouts, narrow frames, side-mounted structures and directional mounting. | The application needs the maximum mounting footprint or very high moment resistance from the flange alone. |
How the LMH Oval Flange Linear Bearing Works
The LMH oval flange linear bearing is used with a round linear shaft. Inside the bearing, rows of steel balls circulate between the shaft and the bearing raceway, reducing sliding resistance and allowing the shaft or bearing housing to move smoothly in a straight line.
The flange provides a direct mounting face, so the bearing can be fixed to a plate without designing a separate bearing seat. The oval shape keeps the bearing compact while still giving the installer a stable and repeatable mounting position.
For the best running performance, the shaft hardness, shaft surface finish, shaft alignment and mounting plate flatness should be checked together. The bearing should not be forced into misalignment, because misalignment can increase friction, noise and wear.
Main Features of Oval Flange Linear Bearings
Oval Flange for Narrow Mounting Space
The oblong flange shape reduces the unnecessary corner area of a square flange. This helps the bearing fit into compact equipment where surrounding parts leave only limited mounting width.
Clear Mounting Direction
The oval shape naturally has a long direction and a short direction. This makes it useful when the bearing must be installed in a defined orientation along the moving axis or inside a narrow machine frame.
Integrated Flange for Direct Installation
The bearing and flange are combined into one unit, reducing the need for a separate bearing housing. This simplifies mounting and helps keep the shaft support structure compact.
Smooth Linear Shaft Guidance
Internal ball circulation reduces motion resistance along the shaft. This supports smooth movement in automation mechanisms, small transfer units and measuring structures.
Suitable for Paired Shaft Structures
Oval flange linear bearings are often used in pairs or in four-bearing arrangements with parallel shafts. This helps improve stability for moving plates, small carriages and guided mechanisms.
Common LMH Oval Flange Linear Bearing Models
LMH models are selected according to the shaft diameter and the available mounting space. For replacement projects, the shaft diameter, flange width, flange height, bearing length and mounting hole size should be confirmed before ordering.
| Model Series | Shaft Diameter | Flange Character | Typical Use |
|---|---|---|---|
| LMH6UU | 6 mm | Small oval flange | Miniature motion units and compact mechanisms. |
| LMH8UU / LMH10UU | 8 mm / 10 mm | Compact oval flange | Small automation, testing devices and light-duty shaft guides. |
| LMH12UU / LMH13UU | 12 mm / 13 mm | Common compact mounting size | Packaging equipment, positioning plates and small transfer mechanisms. |
| LMH16UU / LMH20UU | 16 mm / 20 mm | Larger oval flange | General automation equipment and guided moving plates. |
| LMH25UU | 25 mm | Larger shaft support size | Applications requiring a stronger shaft guide while keeping an oval flange layout. |
Where Oval Flange Linear Bearings Are More Suitable
Oval flange linear bearings are most useful when the design needs both flange mounting and space control. They are not chosen simply because they are another flange shape. They are chosen when the equipment layout requires a narrower or more directional flange footprint.
Compact Automation Equipment
Used in small moving plates, transfer units and compact shaft-guided mechanisms where a square flange may occupy too much space.
Packaging and Printing Machinery
Suitable for repeated linear movement in feeding, pushing, cutting, guiding and positioning structures.
Measuring and Testing Devices
Supports smooth shaft movement in instruments where compact size and stable mounting orientation are important.
Electronics Manufacturing Equipment
Used in light-duty handling, inspection and positioning mechanisms with limited internal installation space.
Important Selection Notes
Oval flange linear bearings are suitable for shaft-guided linear motion, but they should not be treated as a replacement for linear guide rails in high-moment or high-rigidity applications. The shaft support method, bearing spacing and load direction must be considered together.
For a moving plate supported by two parallel shafts, two or four oval flange linear bearings are often used to improve stability. If the load is offset far from the shaft centerline, the design should check whether the shaft diameter, bearing spacing and mounting plate rigidity are sufficient.
For replacement orders, confirm the shaft diameter, flange shape, flange size, bearing length, mounting hole spacing and whether the bearing has seals. Similar-looking flange bearings may not have the same mounting dimensions.
How to Choose the Right Oval Flange Linear Bearing
The right LMH model should match the shaft, mounting plate and working condition. Shaft diameter is the first selection point, but the flange outline and screw hole position are just as important for installation.
| Selection Item | What to Confirm | Why It Matters |
|---|---|---|
| Shaft diameter | 6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm or other required size | The bearing bore must match the linear shaft correctly. |
| Flange outline | Oval flange width, height and surrounding clearance | Prevents interference with frames, covers, nearby screws or moving parts. |
| Mounting hole position | Hole spacing, screw size and plate thickness | Ensures the bearing can be fixed without redesigning the mounting plate. |
| Bearing arrangement | Single bearing, paired bearing or four-bearing layout | Affects plate stability and resistance to offset loads. |
| Shaft condition | Hardness, surface finish, straightness and support method | Poor shaft condition can cause noise, friction and early bearing wear. |
| Working environment | Dust, speed, lubrication, temperature and duty cycle | Helps confirm whether sealed type, lubrication method or material option should be selected. |
DLY Supply Support for LMH Oval Flange Linear Bearings
DLY supplies LMH series oval flange linear bearings for round shaft linear motion systems. Model confirmation can be made according to shaft diameter, flange dimensions, mounting hole position, seal requirement and application conditions.
For new equipment design or replacement projects, customers can provide drawings, photos, shaft diameter, quantity and working environment. DLY can help check whether the oval flange structure is suitable or whether another flange type is more appropriate for the installation space.
FAQ About Oval Flange Linear Bearings
Q: What is an oval flange linear bearing?
A: An oval flange linear bearing is a shaft-guiding linear ball bearing with an oblong flange. The flange allows the bearing to be mounted directly to a plate while saving space compared with a full square flange.
Q: Why choose an oval flange instead of a square flange?
A: An oval flange is useful when the mounting space is narrow or when the corners of a square flange would interfere with other parts. It keeps a stable mounting face while reducing the overall flange footprint.
Q: How is it different from a round flange linear bearing?
A: A round flange provides balanced mounting around the shaft center. An oval flange has a clearer long-axis and short-axis direction, making it more suitable for directional mounting and compact machine layouts.
Q: Can oval flange linear bearings handle moment loads?
A: They can support guided shaft movement, but they are not designed to carry large moment loads alone. For better stability, use paired shafts and multiple bearings, or choose a more rigid linear guide structure when the application has high offset loads.
Q: What shaft should be used with LMH oval flange linear bearings?
A: They should be used with a properly sized round linear shaft. Shaft hardness, surface finish, straightness and alignment affect bearing smoothness and service life.
Q: What information is needed for quotation?
A: Please provide the model, shaft diameter, quantity, flange dimensions if available, seal requirement and application details. Photos or drawings are helpful for replacement projects.
Need Help Confirming an Oval Flange Linear Bearing?
Send us the shaft diameter, bearing model, flange dimensions, quantity or application drawings. DLY can help confirm whether the LMH oval flange structure is suitable for your mounting space.
Email: export@dlybearing.com
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