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Mr. Beranek, You make a good point. A lag screw is nothing more than a round splitting wedge, if not installed properly. I sat through several classes in which videos were presented showing why medical equipment had fallen off of a wall and killed a patient. In many cases, lag bolts were...

True Cory. There are very few instances when the use of lubricants is frowned upon. Joel

August, In a wall stud, either bar soap or wax works well. In a live tree, I would probably go with natural bees wax. I have tried to find my old literature on lag bolts, but I was not able to find it today. Using a 1" lag bolt for ease of math, let's do this...... For every inch of...

August, You're very welcome, my friend. Years ago I was employed as a medical equipment repairman. Needless to say, installing an x-ray unit onto a wood-framed wall was something of a concern. Years of use can cause the lag screws to loosen in the wood. Proper installation is critical for...

A lag bolt can generate tons of friction when being installed. I've seen large lag bolts broken off due to improper installation. The wood must be drilled out to about 3/4 of the diameter of the lag screw. Only the bolt's threads should make contact with the wood. Bolts should be lubricated...