Posted by MCOHIO on February 02, 2012 at 07:56:40 from (98.30.188.174):
In Reply to: Farmall Bolts posted by schultz on February 02, 2012 at 05:09:17:
Bolt grading is very important to usage requirements. Grade 2 has just under a 200,000 psi tensile shear strength and the ability to sustain a shock load better than a grade 5 or 8 just because it has the ability to stretch before it will break. A higher grade is not always the best option . A grade 8 bolt will work loose faster or even break faster than a grade 2 if it is not used for the proper requirements.In severe cold a grade 8 bolt will be very brittle and can snap in two under a seemingly light shear(sideway) load. Cylinder head bolts are grade 8 and hardened because of the fact that they are harder to stretch lengthwise.For agricultural wheel applications a grade 2 bolt is actually more than sufficient, if you think about it most tractors have 6 or more bolts on the rims and 6 grade 2 bolts working together have a tremendous amount of strength.Especially considering that most are 1/2-3/4 in diameter. The grade 5 bolts seem to have the best overall qualities for general purpose use in most any application. Coarse thread bolts will also come loose faster than fine thread bolts of the same grade and size, and almost always will need a lock washer to keep them secure.
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