Haven't got pot metal bolts, just thinking of some machine screw assortments I've bought on Amazon. They've worked fine for 3d printing projects, but makes me wary of fasteners from unknown sources if strength could matter.
Hardware store has been my go to, is that the reference people are using for saying McMaster bolts are 4x overpriced?
Yeah, it is. I wouldn’t worry about low grade bolts from unknown sources, really, unless it’s a safety critical application. The cost benefit to the manufacturer for cheaping out is almost nothing. To make it look like a bolt you’re going to have to make it correctly. You could use a cheaper metal but it doesn’t get much cheaper than low carbon steel which is already what they’re supposed to be made of.
Yeah, if you can buy what you want at big box hardware store, then do, prices won't get much lower than that, and you'll get something that's certified to a standard. McMaster is useful if your time is worth too much to waste it on trips to Home Depot, or if you want something less standard.
I don't usually find the local hardware stores to be cheaper than McMaster.
I see Home Depot has 1/4-20 18-8 stainless steel bolts for $7 a pack of 10. McMaster has them for $8 a pack of 50.
The exception is when I need just one or two of something and it is available in the single-unit bins at the local hardware store. With McMaster the minimum quantity is usually a box of N, but the price per unit usually quite a bit cheaper.
And of course the selection is vastly better. For the above example, I'd usually really buy 316 stainless, which Home Depot doesn't even have.
Hardware store has been my go to, is that the reference people are using for saying McMaster bolts are 4x overpriced?