Tap for Aluminum

The frame screws of my reels are 4-40 UNC. There are 10 such holes (foot & pillars) to tap for each reel. On repetitive tasks, it is good to have the best possible tool. McMaster-Carr sells “Vanadium Steel Hand Taps for Aluminum” which I have used for several months.
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The threaded length on this 4-40 tap is just 0.3 inch; behind that is a reduced diameter shank so that a deeper hole may be tapped.

Here I am tapping a reel foot of 7075 aluminum. This operation proceeds with much less effort (i.e., back and forth working) than is required by the typical hardware store tap.
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