Lock Washers vs Spring Washers

Lock Washers vs Spring Washers

10 Sep 2023
General
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When washers became a popular addition for nut and bolt applications, it was a flat washer design that was first chosen. Flat washers are used to spread the pressure load of a bolted or screwed connection over a larger surface area, preventing buckling and dimpling. But as washers were used more often, engineers soon realized that these simple tools could be adapted to suit a variety of applications. They could actually add to the holding power of the bolt or screw if used correctly.

Differences Between Lock Washers and Spring Washers

Today, there are a variety of lock washers, Nord-Lock washers, and spring washers that are often incorrectly used interchangeably.

Choosing between lock washers and spring washers involves understanding their functions and applications. Both types of washers are used to prevent loosening of fasteners, but they work in slightly different ways. Let's look at the differences between them and explore the ways to choose the right one for your specific situation:

Lock Washers

Lock washers include split washers, toothed washers, and serrated washers. Their main function is to add tension to the fastener assembly, preventing the nut or bolt from coming loose due to vibrations or other external forces. Lock washers are particularly effective in applications where there's a high likelihood of movement and vibrations, such as machinery, automotive assemblies, or heavy equipment. Lock washers are suitable for situations where the torque applied to the fastener is relatively low.

When should you use lock washers?

  1. Vibration-prone Environments: Lock washers are particularly effective in situations where the assembly is exposed to constant or intermittent vibrations. This could include machinery, engines, vehicles, and equipment that generate movement and oscillations during operation.
  2. Low-Torque Applications: Lock washers are a suitable choice when the applied torque is relatively low. They can effectively maintain tension under these conditions and prevent loosening.
  3. Static Loads: In cases where the load on the fastener remains relatively constant and minimal dynamic forces are involved, lock washers can adequately secure the assembly.

Spring Washers

Spring washers, also known as disc springs or Belleville washers, offer a unique solution to prevent fastener loosening. These washers have a conical or curved shape that acts as a spring. When the fastener is tightened, the washer compresses, storing potential energy. This energy is released when external forces act on the assembly, allowing the washer to return to its original shape and maintain tension on the fastener. The spring washer is also economical to produce. Flat washers are cut through in one area and are slightly bent to create a spring that's an effective holding force.

When should you use spring washers?

  1. Dynamic Loads: Spring washers excel in applications where the load on the fastener varies or experiences dynamic fluctuations. Their ability to absorb and distribute these forces makes them ideal for scenarios with changing loads.
  2. Temperature Variations: If your assembly is exposed to temperature changes that could lead to thermal expansion and contraction, spring washers can accommodate these movements while maintaining tension.
  3. Space Considerations: Spring washers require more space compared to lock washers due to their design. If your application has limited space, you might need to assess if spring washers can fit without causing interference.

Factors to Consider

  1. Load and Force: Evaluate the type and magnitude of forces the assembly will encounter. Spring washers are better suited for dynamic loads, while lock washers focus on preventing vibration-induced loosening.
  2. Material and Coating: Choose washers made from materials compatible with the fastener and the application environment to avoid corrosion. Some washers come with coatings for enhanced protection.
  3. Space Constraints: If space is limited, lock washers might be a more practical choice due to their smaller profile.
  4. Torque: For applications requiring higher torque, lock washers are more suitable, as they can maintain tension under elevated torque levels.
  5. Surface Contact: Consider the contact area between the washer and the assembly. Lock washers have a smaller contact area, potentially leading to localized stress. Spring washers offer a larger contact area, distributing loads more evenly.
  6. Environmental Factors: Factors in the surrounding environment, including humidity, chemicals, and temperature variations, can influence the performance of both types of washers.

Order Lock Washers and Spring Washers Online

Nejireo.com in Thailand has a wide variety of lock washers, spring washers and Nord-Lock washers. You can order from their website and have your order shipped anywhere in the country. With the speed and ease of shopping for your washer needs online, make Nejireo.com a trusted supplier to your operations.

Nejireo.com by Hanshin Neji

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We have over 100,000 JIS fasteners in stock, 3-5 days nationwide fast delivery, and start from 1 piece.