[SEL] NC or NF thread

[Curt]

Rick,
Course threads will be less prone to strip.
Fine threads are used to assure high clamping forces.
Take head studs on an automotive engine for example. You'll find course 
threads in the block into which the studs are seated fully. Then the cyl 
head is placed on. High hex fine thread nuts will be used to assure 
plenty of clamping force to keep the gasket sealed.

Here is a brain teaser. You've seen turnbuckles that use a RH and a LH 
thread? Try making a turnbuckle with both RH threads but make one side 
with course threads and the other side with fine threads. The mechanical 
advantage is staggering and you'll be able to really put a tight cinch 
on something. Far more effective than a standard RH/LH turnbuckle.

Curt Holland
Gastonia, NC

Richard Strobel wrote:

>Howdy again;
>  This came up when Paul was pulling his Gib Key.  What thread is most 
>preferred when installing the bolt in order to get the key out?  I suggested 
>NF only because that's what the aircraft I've worked on have.
>
>Headed for the shed.
>
>RickinMt. 
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