US Strat pickup mounting screws are #6-32 x 3/4".
Because the holes in a tele neck pickup are slightly smaller for body mounting, you can use a #4 (1/8") machine screw and not need to force it through. You can get the #6 through but it's best to slightly widen the hole with a drill bit (in your hand) so you don't risk tearing or splitting the fibre flatwork.
Also, what king casey said about the fit of a tele vs strat pickup hole is a consideration, particularly the difference in the distance between the mounting holes of the two.
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