I just love seeing old photos and now I've found one with my beloved nuts & bolts.
I can see they're using SQUARE nuts & bolts which made me ask myself,
"What are the differences between Square Nuts & Hex Nuts?"
Wikipedia actually states it the best.
"Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening)."
I love info like this!!!!
2 More Points
2 More Points
1) A square bolt requires at least 90° of free space, as that's the least amount you can turn it before moving the wrench. A hex bolt only needs you to have 60° of free space, so it's better in a more enclosed environment.
2) Since a normal wrench only puts force on the edges of the bolt head's sides, increasing the number of sides means increasing the area over which the force is spread, thereby reducing wear. This and the issue about elbow-room that was already addressed are probably the main reasons why six or twelve sided bolt heads are the most common.
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