Favorite screwdriver tip/driver bit?

@elb So am I. Any tip shape that won't slip out and gives you a good positive grip is okay my me.

@Ricardus I completely agree, although I tend to think of triangle as a pain in the butt because of the scarcity of bits. Pozi-Driv can be driven by either a Phillips bit _or_ a square drive bit, but it drives flawlessly with high torque with an actual pozi-driv bit.

@elb But any tip that is "conical" in shape can slip out, which is why I don't like to use them.

@Ricardus agreed, although I think the important geometry is the engagement surfaces more so than the overall external profile.

@elb Any bit that's conical in shape requires actual force to hold the bit into the fastener. Things like torx and Allen don't require that pressure for engagement.

@Ricardus That's true if the drive surfaces are an incline (like Philips) but not true if they are parallel (like pozi-driv or ... whatever that Japanese bit is that looks just like Philips but isn't). They're both conical in external profile, but the engagement surfaces meet at nearly a 90 degree angle, so they sit tight in their sockets.

Philips was literally _designed_ to torque out, and for some reason we use it for fasteners with moderate (though thankfully not usually high) torque loads.

@Ricardus See also hollow-ground flat blade screw drivers with parallel surfaces at the tip, versus your typical hardware-store flat blade with bevels.


@elb In some circles those are called Gunsmith Screwdrivers.

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@Ricardus That's what I'd call them, but I wasn't sure how widely-used that term is. In general, firearm screws have very high-quality cut heads with parallel sides, and hollow-ground fitted screwdrivers can turn them out with little to no chance of slippage.

@elb I learned about gunsmith screwdrivers from Adam Savage.

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