I love the 515PR and 515CR Levitons, and I get mine from Zoro. I have probably purchased about 10-12 in the last year to replace worn out power tool cords, fix damaged extension cord ends, etc. The best part is the male 515PRs are less than $2 each, and the female 515CRs are around $3 regular price from Zoro.
I have a bunch of 14/3 SJ cords that came with those and they have been trouble free. That's a REALLY good price too. The plastic is ever so slightly less resilient, but even those are overkill for pretty well any routine garage application. At that price I couldn't see justifying buying stuff from the hardware store. Order a handful of each to have on hand and be done with it!
For those wondering why you'd ever buy the better ones when these are available, apart from the quality of the plastic, the Hubbells are a step up inside as well. The Leviton blades aren't as firmly held in place, the Hubbell has a really nice protective cover for the terminal connections (which also serves to better secure the blades). The terminals are also captive, so you can back them off fully (quickly) without having them come apart on you, and they hold 'open' so you don't have to fiddle with the terminal or use gravity to get them to stay open.
Here's a pic comparing the Leviton 515 on a retired cord beside a new Hubbell 5266.
My production inventory cables are inspected and the terminals tightened as part of routine maintenance. On a 240/120 assembly, a lose Neutral can wreak havoc and cause big damage as voltage swings! Whatever you use, it's a good idea to pop them open now and then to check that everything is tight. You might be surprised by what you find! Using the right screwdriver/bit is key to getting proper torque. 12 in/lbs for the terminals - I've never actually used a torque screwdriver, but this is GJ after all! If you need an excuse for that Utica torque screwdriver you bought, here it is...
Also, if starting with unfinished cable, it
does have a direction. If you find yourself having the criss-cross the conductors to line up with the terminals, you're on the wrong end. Actually.