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How to choose bolt for slewing bearings

2024-08-05

Choosing the right bolts for a slewing bearing is crucial to ensure the bearing functions correctly and safely. Here are some key considerations to keep in mind when selecting bolts for a slewing bearing:

1.Bolt Size and Grade:

Diameter and Length: Ensure the bolt size matches the bolt holes on the slewing bearing. The diameter should fit snugly without excessive play, and the length should allow for proper engagement with the nut or threaded hole.

Strength Grade: Use high-strength bolts, typically grade 10.9 or 12.9, to withstand the loads and stresses in the application.

2.Material:

Choose bolts made from high-quality materials, such as alloy steel, that offer excellent tensile strength and resistance to fatigue. For applications exposed to harsh environments, consider corrosion-resistant materials or coatings.

3.Preload and Torque:

Apply the correct preload to the bolts to ensure even load distribution and to prevent loosening. Use a torque wrench to achieve the specified torque values recommended by the slewing bearing manufacturer.

4.Bolt Pattern and Number:

Follow the manufacturer's recommendations for the bolts pattern and the number of bolts required. This ensures even load distribution and prevents overstressing any single bolt.

5.Locking Mechanism:

Consider using locking mechanisms such as lock nuts, spring washers, or thread-locking compounds to prevent the bolts from loosening due to vibrations.

6.Application-Specific Requirements:

Take into account specific application requirements such as dynamic loads, environmental conditions, and safety factors to ensure the bolts are suitable for the intended use.

Following these guidelines will help ensure that the slewing bearing is securely fastened and operates reliably under various conditions. 

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