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The bolts I tapped were 1/4-24 (left) and 1/2-20 (center). The bolt to torque (right) was 3/8-16. (I did not write it down but looking at this picture, I think the first 2 bolts were 2 inches long and the one to be torqued was 1.5 inches.)
TAP chart from the engineering site - The drill bit for the 1/4 bolt is a #4, and for the 1/2 inch bolt is 29/64. The decimal equivalents are .209 and .451.
Drilling for the 1/2 inch bolt
Videos of the drilling and tapping process.
Tapping the hole for the 1/2 inch bolt
Identification of Torque Spec - from engineering site
Torquing Bolt - The bolt was 3/8-16 and torqued to 15 foot pounds
Pictures of final project - There are 3 bolts. 2 Tapped and 1 torqued
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