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Message: <blockquote data-quote="Perplexed" data-source="post: 4391766" data-attributes="member: 7157">I’m planning to use a 1/4-20 carriage bolt for my latest hassock fan project, but I wanted a dark finish instead of the zinc plated appearance of the factory bolt.   I turned down the head on my lathe to get rid of the casting numbers, then trimmed the edge a bit.  After that, I heated the head with a butane torch till almost red hot, and dunked the bolt into a tub of used motor oil.  Here’s the result compared to an untouched bolt.  I think it’s a pretty neat way to darken steel other than painting it…[ATTACH=full]544748[/ATTACH]</blockquote>