This is what comes to mind when you say monkey wrench. I'd also call it a
Crescent wrench is a whole different animal. Monkey wrench is used for
turning pipe and fittings. Crescent is used to turn four or six sided nuts
That depends on what you call "monkey wrenches". For me, it is not a
Crescent wrench nor is it a pipe (Stillson) wrench.
Crescent wrench openings are shaped to fit hex or square nuts.
Pipe wrenches are "F" shaped, the jaws are serrated and - most importantly -
the top jaw moves laterally when turning on something so that the head
wedges. It is meant for pipe.
What I always called a monkey wrench was also "F" shaped but the jaws were
not serrated and the head did not deflect when turning on an object. It was
meant for nuts, not pipe. The first picture here is what I am talking
about, third one to the right of it is a pipe wrench.
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