Fine Adjustment Screws vs. Ultra-Fine Adjustment Screws: What's the Difference?

Are you looking for adjustment screws but aren’t quite sure on the differences between fine adjustment screws vs. ultra-fine adjustment screws? We want to help clear up that confusion. 

When it comes to comparing fine adjustment screws to ultra-fine adjustment screws, the most obvious difference is the number of threads that the screws have. Ultra-fine adjustment screws have more threads per inch (TPI) compared to fine adjustment screws. Fine adjustment screws contain 40 to 100 threads per inch, where ultra-fine adjustment screws consist of 100 to 500 threads per inch.

In terms of usage, there is a difference between fine adjustment screws vs. ultra-fine adjustment screws. Fine adjustment screws are typically used for applications where precision is needed but travel distance is still relatively large. In comparison, ultra-fine adjustment screws are used when applications require extra precision and travel distances that are smaller. 

So when searching for the ideal adjustment screw, remember to take note of two things that differentiate them from each other. The two main differences between fine adjustment screws vs. ultra-fine adjustment screws are their threads per inch and when they are used.

Selection of Fine Adjustment Screws


At Kozak Micro Adjusters, we offer 80 TPI and 100 TPI options for fine adjustment screws. For both of these options we have multiple lengths that are available. We also have a selection of high-vacuum fine adjustment screws that are offered.

When dealing with metric threads, fine adjustment screws would include M2-0.25 screws and M3-0.25 screws. Below are the options that we supply at Kozak:

All of the options above come in various lengths, from 8mm to 20mm, and provide sub-micron sensitivity. Additionally, upon request, all of our fine adjustment screws can be supplied with optional materials, drive variations, or custom lengths or tips. 

Our Ultra-Fine Adjustment Screws

Ultra-fine adjustment screws include adjustment screws that are above 100 TPI. When searching for the ultra-fine adjustment screw that you need, we have the following options for threads per inch:

  • 127 TPI
  • 200 TPI
  • 254 TPI
  • 508 TPI 

At Kozak Micro Adjusters, we offer the above selection in screw and bushing matched sets. Below are the ultra-fine adjustment screws that we offer for metric threads:

In addition, we also offer all of these ultra-fine adjustment screws in metric screw and bushing matched sets.

Contact Kozak Micro Adjusters for Your Adjustment Screws 

Now that you know the difference between fine adjustment screws vs. ultra-fine adjustment screws, you are able to make your selection.  If you’re looking for something that you’re not seeing with our in-stock adjustment screws, reach out to our team to start your custom order.

We take pride in our ability to provide high-quality, cost-efficient adjustment screws to our customers.