In the world of industrial motion systems, set screw mounted ball bearings are a popular and practical solution for securing shafts in place. These bearings are found in countless machines across manufacturing, agriculture, HVAC, and other heavy-duty industries. But what exactly are they, and when is the right time to use them?
Let’s break it down.
What Is a Set Screw Mounted Ball Bearing?
A set screw mounted ball bearing is a type of insert bearing that comes pre-mounted in a housing and includes set screws (typically two) to secure the bearing onto a shaft. The set screws are located in the inner ring of the bearing and press against the shaft to lock it in place.
This makes installation quick and simple, especially compared to more complex shaft-locking methods like taper locks or adapters.
Key Features
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Easy Installation: Set screws are easy to tighten with standard hex tools.
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Reliable for Light to Moderate Loads: Ideal for applications where the shaft load isn't excessively high.
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Cost-Effective: Generally more affordable and accessible than other mounting styles.
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Versatile Housing Options: Available in pillow blocks, flange mounts, take-up units, and more.
Common Applications
Set screw mounted ball bearings are widely used in:
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Conveyors
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Fans and blowers
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Agricultural equipment
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Packaging machinery
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HVAC systems
They are ideal for low to moderate speeds and environments where simplicity and reliability are priorities.
When to Use (and When Not to Use) Set Screw Bearings
Use them when:
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You need a quick, simple installation.
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Shaft misalignment is minimal.
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Shaft hardness is compatible with set screw mounting.
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You want a cost-effective bearing solution for low to moderate speeds and loads.
Avoid them if:
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The application involves very high speeds or heavy radial loads.
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Your shaft is made of a soft material (the set screw can damage the shaft).
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You need frequent disassembly and reassembly (set screws can become unreliable over time).
Pro Tip: Use Shaft Collars or Dimpled Shafts
To prevent slippage and minimize shaft damage, consider using a shaft with a dimple or flat surface where the set screw will contact. Alternatively, add a shaft collar for extra security in high-vibration environments.
Set Screw vs. Other Locking Methods
| Locking Method | Best For | Pros | Cons |
|---|---|---|---|
| Set Screw | General industrial use | Easy, low-cost | Can damage shafts |
| Eccentric Locking Collar | Ag equipment | Quick install | Not for reverse rotation |
| Tapered Adapter | High-load systems | Very secure | Requires precise installation |
| Concentric Clamp | High-speed or soft shafts | No shaft damage | More expensive |
Final Thoughts
Set screw mounted ball bearings are a tried-and-true solution for a wide range of mechanical systems. Their ease of use, affordability, and availability make them a go-to option in many industries. However, like any component, selecting the right bearing depends on your specific application needs.
If you're unsure which mounted bearing type is best for your project, consult with an experienced bearing distributor.
Need Help Choosing the Right Bearing?
At MRO-PT.com, we offer a wide range of mounted ball bearings, including set screw styles, in stock and ready to ship. With over 20 years of experience in industrial support, we’re here to help you make the best choice for your machinery and keep your operations running smoothly.