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The extra torque is due to friction under the tapered head.
The large surface area under the bolt head between the bolt and the steering wheel gives a lot of friction which makes it necessary to use more torque than the threads themselves would require. Same as a wheel bolt , which is why I always use neverseize on my wheel bolts. The hard metal of the bolt also deforms and squishes the potmetal of the steering wheel which contributes to the extra force. Cheers Dan
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