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zoran

macrumors 68040
Original poster
Jun 30, 2005
3,921
68
I dont understand whats the size of the screw im attaching. The guy holding it says its "metric eight" size... what does that mean?
 

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D.T.

macrumors G4
Sep 15, 2011
11,051
12,454
Vilano Beach, FL
I dont understand whats the size of the screw im attaching. The guy holding it says its "metric eight" size... what does that mean?


It's just metric, M8 = 8mm diameter (though there's potentially some variant in the thread, fine vs. course, but assuming something standard, like an M8 x 1.25), that's vs. an imperial spec that uses inches, ex: 5/16" (~7.9mm)
 

zoran

macrumors 68040
Original poster
Jun 30, 2005
3,921
68
Thanks but i dont understand what you say... "variant in the thread" and "fine vs. course"... what are you trying to say? :oops:
 

D.T.

macrumors G4
Sep 15, 2011
11,051
12,454
Vilano Beach, FL
Thanks but i dont understand what you say... "variant in the thread" and "fine vs. course"... what are you trying to say? :oops:

If you look at a screw/bolt, it has threads, right? There's a specification as to how many threads per X are on the fastener, more = fine, less = course (more or less), i.e., just because you match the diameter spec (M8 or 5/16") doesn't necessarily mean it will work.

My recommendation: take the part you're trying to match to a hardware store where they sell fasteners, and test for proper fitment.
 
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jeyf

macrumors 68020
Jan 20, 2009
2,173
1,040
most cities have several industrial supply houses that specialize in fasteners. Pick one with good with counter service.
 

DeltaMac

macrumors G4
Jul 30, 2003
11,674
3,473
Delaware
"... fine vs. course ...", should be "... fine vs. coarse ... ", which is the relative measurement of thread pitch.
 
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