Is there a difference between Allen wrenches and hex keys?

How about carpenters’ trangle squares? Everybody calls them “speed squares” but that name belongs to Swanson.

This is a “spanner.”

Those other things are open-ended (or combo) wrenches.

OK, but what’s a 3/17 occipital left-leaning Heterodyne wrench?

That’s an old-fashion Stillson wrench in the UK. Here in the good old US of A it’s a Monkey wrench, once believed to be named after Charles Moncky but actually named so because of its utility in all sorts of monkey business.

That is a specific type of spanner, a pin spanner or retaining ring spanner. The term spanner is used for a variety of wrenches including open-ended wrenches. I’d certainly refer to the wrenches I use on my angle grinders as ‘spanner’ wrench and they look totally different then the spanner you linked.

Brits always stealing proper English terms and reusing them for something else…

A ‘Stillson’ wrench has teeth, they were made for pipe like the inventor intended!. A monkey wrench doesn’t have teeth, so they are terrible for pipe. They are used on a variety of nuts and bolts and what not(frequently automotive) also known as a ‘Ford’ wrench.

Not really.
Yours are just fixed - the one I linked to is adjustable (and precision). Both type mate with holes or slots at the periphery of the nut.

That was just a cartoon drawing. An actual occipital left-leaning Heterodyne wrench is a Pipe wrench.

Puts them in the same family of spanner wrenches. Pin spanners.

How about hook spanners?

I would call that the “you know… the wrench that loosens the water filter cartridge housing” wrench.
:smiley:

Yeah that’s what I use them for when I can’t find the correct cartridge filter wrench.

We call them C-spanners. And crescent wrenches are called ‘shifters’ or ‘adjustable spanners’ - and incidentally have been banned from use in a lot of workplaces I have been in - apparently slipping is a safety concern. go figure.

I’m surprised at the international variety of names in the common tool catalogue. Must make for some confusing moments and plenty of ribbing if a tradesmen relocates himself internationally.