is there such a thing?

Heah, CR.

I know that you wanted a local source, but if you fail to find what you need in NYC then perhaps This is what you need?

Also, I had a similar dilemma with my primary UPS. Iirc I found what I needed at Friedman Brothers (comparable to Home Depot).

Good luck you Modding Madman. You rock!

Don't most/all 20 amp cords have the power and neutral prongs set up horizontal/vertical? I know with 15 amp cords they're both vertical, but I'm pretty sure the 20 amp cords are designed so that they wont fit in a 15 amp receptacle.
Example 15 amp vs 20 amp receptacle:

thanks for the replies guys.
its to run a MIG/GMAW-FCAW welding machine that is rated for 60hz Single Phase 20 Amp off of a standard 110-120V recepticle as pictured by HeadCase9 above, on the left. The plu on the unit is the standard shape, not notched. Its a washer/dryer circuit in my basement, inside from the garage. Its the only 20 amp circuit I have down there. Turns out I have been using a 15 amp extension cord all this time with my less beefy stick welder (also 20 amp input but 90 amps dc out) and dint know it. I have had that thing pinned to max output but I never cooked the extension - which puzzles me. It might be because its short runs like 15 seconds tops. I dont have a multimeter that can measure amperage above 10A so I cant test it, but the voltage at the recp is 123.3.

My new MIG welder can deliver 140A DC when set on full (E/A-E) but I havent gone past D/A-E setting yet (luckily). I needs me a new cord or there is some funny business going on with the recepticle. I know the standard plugs can plug into the notched 20 amp recepticles. Maybe the receptical needs to be changed to notched and get a notched cord?

Quote:
You can just buy the plugs and service cord from mcmaster and make your own. That's typically what I do.

I need locally tomr
I think its just home deepblow's web site search is horrid. I bet you they have them.
I have to go there tomr to get some angle iron and bar because I am making a cart for my new mig machine its gonna have upright handles to move it and store the gun and ground clamp, and an area in the back to house a gas bottle for when I add gas in the spring (MIG/GMAW) I am currently doing MIG/FCAW