This plug does the job, but it doesn't do it well.

I bought this to power some new machinery in my home shop. There was already an old 220v line, but it had the wrong NEMA configuration. So, what should have been a five minute swap-out job ended up taking about an hour because of poor product design and quality.

The wire clamps on this receptacle use some thin sheet metal nuts that float in place until you get the screw clamped down tight. Due to their size and awkward shape, you'll have trouble holding them in place. You'll drop them several times, and because they move around so much while tightening, you'll probably have to tighten and loosen them two or three times to make sure the wire gets clamped down in the right position.

To even get the nuts in place, you'll have to take the screws out once (because they arrive half-installed in the product, I figure so they don't get lost in S&H), and since the nuts float around so much and are so hard to hold, the screws are going to end up rubbing against some of the surrounding encasing as they come out. That trashes the threads on the screw (it's cheap metal), and means that to fix the threads, you'll have to clamp the nut in a vise, then run the screw back and forth through it several times.

It was just a PITA to work with.

Interestingly, the receptacle I was replacing was also a Leviton, but much older. It used a very sturdy fixed-nut assembly that made taking it out (and even reinstalling it, which I did last week before buying the new plug) extremely easy. Plus, the plastic case on it was more than twice as thick as the new one. The new one will flex under finger pressure alone, so be careful around it. You wouldn't want to accidentally bump it with a piece of steel tubing while welding or your might crack the case... exposed wires... steel tube... 220v... Not good.

I'd gladly pay double for something on par with the old receptacle, but of course, we don't have that option. I suppose Leviton saves a quarter or so on each receptacle by using such a cheap design, and maybe (maybe!) those savings are passed on to us, but I'd rather pay the extra money and save the time and frustration.

You might find something better at McMaster-Carr. I should have looked there first.
This plug does the job, but it doesn't do it well. I bought this to power some new machinery in my home shop. There was already an old 220v line, but it had the wrong NEMA configuration. So, what should have been a five minute swap-out job ended up taking about an hour because of poor product design and quality. The wire clamps on this receptacle use some thin sheet metal nuts that float in place until you get the screw clamped down tight. Due to their size and awkward shape, you'll have trouble holding them in place. You'll drop them several times, and because they move around so much while tightening, you'll probably have to tighten and loosen them two or three times to make sure the wire gets clamped down in the right position. To even get the nuts in place, you'll have to take the screws out once (because they arrive half-installed in the product, I figure so they don't get lost in S&H), and since the nuts float around so much and are so hard to hold, the screws are going to end up rubbing against some of the surrounding encasing as they come out. That trashes the threads on the screw (it's cheap metal), and means that to fix the threads, you'll have to clamp the nut in a vise, then run the screw back and forth through it several times. It was just a PITA to work with. Interestingly, the receptacle I was replacing was also a Leviton, but much older. It used a very sturdy fixed-nut assembly that made taking it out (and even reinstalling it, which I did last week before buying the new plug) extremely easy. Plus, the plastic case on it was more than twice as thick as the new one. The new one will flex under finger pressure alone, so be careful around it. You wouldn't want to accidentally bump it with a piece of steel tubing while welding or your might crack the case... exposed wires... steel tube... 220v... Not good. I'd gladly pay double for something on par with the old receptacle, but of course, we don't have that option. I suppose Leviton saves a quarter or so on each receptacle by using such a cheap design, and maybe (maybe! ) those savings are passed on to us, but I'd rather pay the extra money and save the time and frustration. You might find something better at McMaster-Carr. I should have looked there first.