Modding Botls - I need some help.......please

I'm about to embark on my first serious mod, inspired by the genius I've seen on these forums . One thing I've learnt is the importance of preparation

SO I 'm trying to find out what the bolts sizes are that are used in contructing a PC e.g standard case bolt sizes, hard drive mounting etc. I have but to no avail. Can anyone help me here
Thanks

 

I did of course mean BOLTS...... Fisrt post and I mess up

 

http://www.formfactors.org/formfactor.asp

That should give you a start. Just select the form factor, and you're away.

 

I have never seen anything but 6-32 and M3. All my CD/DVD-ROM and floppy drives use M3. All my hard drives use 6-32. Maximum allowed penetration of the screws into the hole is usually 0.15" (3.8mm) max., sometimes 0.25in (6mm). Minimum required penetration seems to be 0.125" (3.2mm), but that's just a guess.

Seagate has drawings for HD in their documentation for download and Sony has drawings for CDs. The best documentation I found for a floppy was from YE-Data (never heard about them before), google for FDAA-520037 to find the document.

The studs for mounting the motherboard must stick out 0.088" (2.235mm) above the lower edge of the ATX-I/O cutout and have at most 0.4" (10mm) diameter (ATX Rev. 2.1.). They can either be M3 or 6-32.

 

Hi, please could you tell me what you mean by 6-32? i understand the m3 etc... bu not the 6-32
thanks
mark

 

6-32 is the US equivalent of M3. It is a #6 wire gauge diameter screw with 32 turns per inch. Confused ? Don't, worry you are not alone. For larger screws (then called bolts) the diameter is given in fractional inches, such as 1/4-20 for 0.25 inch diameter with 20 turns per inch. Check link for exact dimensions.

http://cfa-www.harvard.edu/~masermri/screws/screw1.html

 

I used 6-32 through-out my case, but found that the CDR, DVD and HD mount holes were some size slightly smaller...no problem I just tapped them out. Bottom line, the mounting screws for HD's and such may be a smaller size than 6-32.

 

Thankyou

 

Thanks folks, it's appreciated - on with the planning!

 

http://www.efunda.com/designstandards/design_home.cfm <-- wow. cant believe i never found this before, useful info about everything.