Help With Screw Size Please...

[darita]

I need some cap head screws for my MFT 1080.  Parts calls for M8x14-8.8.  I'm looking for a source other then Festool, but I'm not sure how to interpret M8x14-8.8 to do a search.  I looked on McMaster Carr, but got confused on the numbers.  Help please?

 

[Coen]

M8 = standard metric thread, 8mm
14 = length... 14mm
8.8 = strength class

 

[darita]

M8 = standard metric thread, 8mm
14 = length... 14mm
8.8 = strength class

That's where I got confused.  I was mistaking the 8.8 strength for the thread size 1.25.  Thanks for the explanation. 

 

[Coen]

If standard thread, thread size is usually not mentioned. DIN or ISO norm usually is mentioned, all missing details can be found there.

Not everywhere 8.8 is used it's absolutely necessary. Might be that they just don't want to keep stock of different strength classes on the manufacturing floor. Using more expensive 8.8 everywhere might reduce fail costs by preventing 4.6 from being used in places where 8.8 IS required.