In a message dated 3/6/03 3:23:11 PM, [EMAIL PROTECTED] writes:

<<
I was able to get screws that fit by just going to the hardware store, except 
I could only find slotted screws, as opposed to philips.
>>

M3-0.5 are ISO standard and are available everywhere, although not in all 
lengths and in all screw head types.

M3.5-0.6 is a now obsolete screw which Apple adopted in 1984 (while this size 
was still a quasi-standard) and Apple needed a metric screw with the 
approximate holding capacity (under tension and shear) of a 6-32 UNC.

The M3.5-0.6 was selected as this was the closest metric size with the 
required physical characteristics.

I know of no other equipment, besides Apple, which still uses the M3.5-0.6.

Right now, there is a large "void" in metric machine screws, between the M3, 
with the approximate holding capacity (under tension and shear) of a 4-40 
UNC, and the M4, with the approximate holding capacity (under tension and 
shear) of an 8-32 UNC.

Meanwhile, the 6-32 UNC machine screw is just about the de-facto standard for 
most purposes, including retention of PCI cards, retention of disk drives, 
and retention of motherboards, power supplies and other case components.

One of the few applications for the 4-40 UNC is D-Subminiature connectors.

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