Posted by Janicholson on April 21, 2012 at 11:07:07 from (67.72.98.45):
In Reply to: fine thread bolts posted by charlie M on April 21, 2012 at 07:03:48:
Fine thread bolts have more holding power in sertain materials, but not all. If screwed into soft material (aluminum, plastic, or pot metal for instance, they have much less strength than course threads. If one looks at the minor diameter of fine threads it will be proportionately larger than course threads. this gives fine threads, of equal grade, a small advantage against breakage at the threads over course threads. Clamping force on a bolt is increased with fine threads up to the tensile strength of a bolt. Remember, a finger tight bolt will hold a bumper on a truck with all its tensile strength. a bolt tightened to 90% of its tensile strength will only hold 10% of its strength!!!! Thus the reason for torque requirements on lug bolts to keep them within the strength required to hold the wheel on. Compressing a head gasket is similar in that once it seals, more tightening just reduces the strength of the force holding the head against combustion pressure. Yield strength and bolt stretch, turn of bolt systems, and torque are for another day. Jim
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