Power at Work: What you should know about bolts, metric and imperial

Some tips to help you through the maze of different grades and nomenclatures of bolts in use around farm machinery

by RALPH WINFIELD

Most of us buy bolts by size, but now that we have both the old imperial system and the more recent metric system, we can easily be confused. When we add the two grading systems for bolts, we become really confounded.

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