Deciding Coarse Or Fine Thread ?

[Mike99]

From The Society of Manufacturing Engineers training manual on threading:

There are several thread types, but the broadest categories are coarse and fine. This refers to the number of threads per inch. Fine threads have more threads per inch, and have more holding power. Fine threads are also more resistant to vibration. Coarse threads resist stripping and lend themselves to automatic assembly.



Sent from my iPad using Tapatalk

 

[Bill Gruby]

This will help you understand a little. It's short but to the point.

http://www.katonet.com/article/coarsevsfine.html

"Billy G"

 

[zmotorsports]

Thanks Bill, that is similar to what I had read years ago and have experienced in the industrail field.

Mike.

 

[Wreck™Wreck]

The quality of the thread and the material used will also play a roll. Most bolts used on engines for example will be rolled thread and most likely be a high tensile bolt. Rolled thread will be much stronger than normal machined threads. So the pitch is not the only thing to look at

Virtually all threaded fasteners (bolts and screws) produced in the west for mass use are roll threaded, products that can not be easily rolled due to their shape are cut, the necks of fluid valves for instance, think of simple household variety water valves being an example, not easily rolled.

Many consumer products are made with rotary transfer equipment, do a google search using the terms "rotary transfer machine" you may find it fascinating.