Measuring Tips

 
More than you ever wanted to know about measuring screws

 

 
 
 
 

      

      

Notes on sizing: Average dimensions are given for each screw. These are useful if you are trying to find an exact replacement screw. However, in most cases you can substitute a slightly longer or shorter screw.

 

For instance the difference in the length of a screw that is 2.20 and one that is 2.40 is only the thickness of a business card. A dollar bill is 0.1mm thick and a blonde hair is .04mm 

Diameter
The actual diameter of an M3 screw is usually about 2.9mm, an M2.5 screw is 2.4mm and an M2 is 1.9mm. So if you are measuring the screw yourself and your caliper says the screw diameter is 2.4mm you have to order an M2.5 screw to match it.

Length

Screws are listed under their thread length in the case of pan head and wafer head or under their overall length in the case of flat head screws. We give the dimensions in each description.

 

Service Manuals

If you are searching for laptop screws be aware that some laptop manufacturers (ie HP & Compaq) measure overall length but some measure from underneath the head like you would a regular pan head. If an HP or Compaq manuals calls a 9mm length order an 8mm screw.  Also  be aware that mistakes have been found in some manuals. M2.5 reported as M2 or M3 reported as M2.5

 

If you are having difficulty locating your exact size don't forget to look at the larger or smaller sizes as it may not be listed under the heading where you are searching.

 

Please don't hesitate to write if you have any problems using our new layout.

 

Yes, we know that it is confusing. We are trying to remedy that as much as possible. If you have any recommendations about how we can improve your buying experience please don't hesitate to let us know.

 

See our FAQ page for more tips

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