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Old 04-20-2005, 10:38 AM  
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Try Hard,

The 4-40 flat head screws and button head screws (most of the chassis screws that is) are a 1/16" (.063) allen.

The cap head 4-40's (rear wheel bolts) take a 3/32" (.093) allen wrench.

The 4-40 set screws need the .050, and 2-56 screws usually take the .050 as well.

Pinions typically use a 5-40 set screw these days, it takes the 1/16" (.063) wrench, but some older pinions have 4-40 setscrews and will need the .050.
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