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GSRocket
11th August 2012, 02:29 PM
Hi Guys.......For best holding power in Aluminium is course or fine thread best?

Clubman7
11th August 2012, 03:30 PM
Lots of scope there for answers.
Normally a fine thread is stronger.
If its a hole that your talking about, you can fit a thread insert into the hole and this will
provide extra strength for what your screwing into it.

GSRocket
11th August 2012, 03:44 PM
Lots of scope there for answers.
Normally a fine thread is stronger.
If its a hole that your talking about, you can fit a thread insert into the hole and this will
provide extra strength for what your screwing into it.
It's not a critical application, it's just that at the moment I have a choice and a lot of holes will be made. It's only a 5mm hole.
I know in steel fine is best...It's just that I vaguely recall or read or something from somewhere that because it's a softer material course was best.

nadroj
11th August 2012, 03:51 PM
Fasteners for aluminium alloys are almost always of a coarse thread.
The only exception I've seen was when the thread provided a means of fine adjustment. For example, on a motorcycle gearbox casting (to adjust the input drive chain's tension), and its 5/16 x 26tpi thread is prone to stripping (the gearbox, not the adjusting bolt).

Jordan

Gerbilsquasher
11th August 2012, 04:43 PM
+1 coarse thread

shedhappens
11th August 2012, 04:58 PM
+1 coarse thread

...and for more strength you would use a stud so that you are less likely to pull the tread out when tightening

GSRocket
11th August 2012, 05:02 PM
Thanks guys.................It's good to have a vague memory confirmed :U